CAD二次开发（C#） 第一节_c#cad二次开发

前言

由于工作需要，最近在学习二次开发，将其记录于此，以便日后查看。

语法

涉及“特性”，“进程”知识点，需要有所了解

#region CAD二次开发--第一节
        /// <summary>
        /// 进程内或进程外
        /// </summary>
        [CommandMethod("ConnectToAcad")]
        public static void ConnectToAcad()
        {
            AcadApplication acAppComObj = null;
            const string strProgID = "AutoCAD.Application.19";
            try
            {
                acAppComObj = (AcadApplication)Marshal.GetActiveObject(strProgID);
            }
            catch
            {
                try
                {
                    //创建新的AutoCAD实例
                    acAppComObj = (AcadApplication)Activator.CreateInstance(Type.GetTypeFromProgID(strProgID), true);
                }
                catch
                {
                    //创建新实例不成功就显示信息并退出
                    MessageBox.Show("Instace of 'AutoCAD.Application'" +
                         " could not be created.");
                    return;
                }
            }
            //显示获得的应用程序实例并返回名称、版本
            acAppComObj.Visible = true;
            MessageBox.Show("Now running " + acAppComObj.Name + " Version " + acAppComObj.Version);
            //获取当前文档
            AcadDocument acDocComObj;
            acDocComObj = acAppComObj.ActiveDocument;
            //可选的，加载程序集并启动命令，如果进程内程序集
            //已被加载，直接启动命令即可
            acDocComObj.SendCommand("(command " + (char)34 + "NETLOAD" + (char)34 + "  " +
                (char)34 + "E:/VS2017/C#/CAD二次开发/CADSyntheticalDemo/CADExtends/bin/Debug/CADExtends.dll" + (char)34 + ")");
            acDocComObj.SendCommand("你好CAD");
        }

        /// <summary>
        /// LISPFunction
        /// </summary>
        /// <param name="rbArgs"></param>
        [LispFunction("DisplayFullName")]
        public static void DisplayFullName(ResultBuffer rbArgs)
        {
            if (rbArgs != null)
            {
                string strVal1 = "";
                string strVal2 = "";

                int nCnt = 0;
                foreach (TypedValue rb in rbArgs)
                {
                    if (rb.TypeCode == (int)Autodesk.AutoCAD.Runtime.LispDataType.Text)
                    {
                        switch (nCnt)
                        {
                            case 0:
                                strVal1 = rb.Value.ToString();
                                break;

                            case 1:
                                strVal2 = rb.Value.ToString();
                                break;
                        }
                        nCnt++;
                    }
                }
                Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor.
    WriteMessage("\nName: " + strVal1 + " " + strVal2);
            }
        }

        /// <summary>
        /// 最大、最小化应用窗体
        /// </summary>
        [CommandMethod("MinMaxApplicationWindow")]
        public static void MinMaxApplicationWindow()
        {
            //最小化应用程序窗口
            Autodesk.AutoCAD.ApplicationServices.Application.MainWindow.WindowState = Window.State.Minimized;
            System.Windows.Forms.MessageBox.Show("Minimized", "MinMax",
                System.Windows.Forms.MessageBoxButtons.OK,
                System.Windows.Forms.MessageBoxIcon.None,
                System.Windows.Forms.MessageBoxDefaultButton.Button1,
                System.Windows.Forms.MessageBoxOptions.ServiceNotification);
            //最大化应用窗口
            Autodesk.AutoCAD.ApplicationServices.Application.MainWindow.WindowState = Window.State.Maximized;
            System.Windows.Forms.MessageBox.Show("Maximized", "MinMax");
        }

        /// <summary>
        /// 获取应用窗口当前状态
        /// </summary>
        [CommandMethod("CurrentWindowState")]
        public static void CurrentWindowState()
        {
            System.Windows.Forms.MessageBox.Show("The application window is " +
                Autodesk.AutoCAD.ApplicationServices.Application.MainWindow.WindowState.ToString(),
                "Window State");
        }

        /// <summary>
        /// 使应用程序窗体可见或不可见
        /// </summary>
        [CommandMethod("HideWindowState")]
        public static void HideWindowState()
        {
            //隐藏应用程序窗口
            Autodesk.AutoCAD.ApplicationServices.Application.MainWindow.Visible = false;
            System.Windows.Forms.MessageBox.Show("Invisible", "Show/Hide");
            //显示应用程序窗口
            Autodesk.AutoCAD.ApplicationServices.Application.MainWindow.Visible = true;
            System.Windows.Forms.MessageBox.Show("Visible", "Show/Hide");
        }

        /// <summary>
        /// 设置当前文档窗口的位置和大小
        /// </summary>
        [CommandMethod("SizeDocumentWindow")]
        public static void SizeDocumemntWindow()
        {
            //获取当前文档窗口
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            acDoc.Window.WindowState = Window.State.Normal;
            //设置文档窗口位置
            Point ptDoc = new Point(0, 0);
            //acDoc.Window.Location=ptDoc;
            //设置文档窗口大小
            Size szDoc = new Size(400, 400);
            //acDoc.Window.Size = szDoc;
        }

        /// <summary>
        /// 最大最小化当前窗口
        /// </summary>
        [CommandMethod("MinMaxDocumentWindow")]
        public static void MinMaxDocumentWindow()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            //最小化文档窗口
            acDoc.Window.WindowState = Window.State.Minimized;
            System.Windows.Forms.MessageBox.Show("Minimized", "MinMax");
            //最大化文档窗口
            acDoc.Window.WindowState = Window.State.Maximized;
            System.Windows.Forms.MessageBox.Show("Maximized", "MinMax");
        }

        /// <summary>
        /// 获取当前活动文档窗口的状态
        /// </summary>
        [CommandMethod("CurrentDocWindowState")]
        public static void CurrentDocWindowState()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.
                Application.DocumentManager.MdiActiveDocument;
            System.Windows.Forms.MessageBox.Show("The document window is " +
                acDoc.Window.WindowState.ToString(), "Window State");
        }

        /// <summary>
        /// 获得当前文档视图
        /// </summary>
        /// <param name="pMin">区域左下角3D点</param>
        /// <param name="pMax">区域右上角3D点</param>
        /// <param name="pCenter">视图中心的3D点</param>
        /// <param name="dFactor">视图缩放比例</param>
        static void Zoom(Point3d pMin, Point3d pMax, Point3d pCenter, double dFactor)
        {
            //获取当前文档及数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.
                Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;

            int nCurVport = System.Convert.ToInt32(Autodesk.AutoCAD.ApplicationServices.
                Application.GetSystemVariable("CVPORT"));
            //没提供点或只提供了一个中心点时，获取当前空间范围
            //检查当前空间是否为模型空间
            if (acCurDb.TileMode == true)
            {
                if (pMin.Equals(new Point3d()) == true &&
                    pMax.Equals(new Point3d()) == true)
                {
                    pMin = acCurDb.Extmin;
                    pMax = acCurDb.Extmax;
                }
            }
            else
            {
                //检查当前空间是否为图纸空间
                if (nCurVport == 1)
                {
                    //获取图纸空间范围
                    if (pMin.Equals(new Point3d()) == true &&
                        pMax.Equals(new Point3d()) == true)
                    {
                        pMin = acCurDb.Pextmin;
                        pMax = acCurDb.Pextmax;
                    }
                }
                else
                {
                    //获取模型空间范围
                    if (pMin.Equals(new Point3d()) == true &&
                        pMax.Equals(new Point3d()) == true)
                    {
                        pMin = acCurDb.Extmin;
                        pMax = acCurDb.Extmax;
                    }
                }
            }
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //获取当前视图
                using (ViewTableRecord acView = acDoc.Editor.GetCurrentView())
                {
                    Extents3d eExtents;
                    //将WCS坐标变换为DCS坐标
                    Matrix3d matWCS2DCS;
                    matWCS2DCS = Matrix3d.PlaneToWorld(acView.ViewDirection);
                    matWCS2DCS = Matrix3d.Displacement(acView.Target - Point3d.Origin) *
                        matWCS2DCS;
                    matWCS2DCS = Matrix3d.Rotation(-acView.ViewTwist, acView.ViewDirection,
                        acView.Target) * matWCS2DCS;
                    //如果指定了中心点，就为中心模式和比例模式
                    //设置显示范围的最小点和最大点
                    if (pCenter.DistanceTo(Point3d.Origin) != 0)
                    {
                        pMin = new Point3d(pCenter.X - (acView.Width / 2),
                            pCenter.Y - (acView.Height / 2), 0);
                        pMax = new Point3d((acView.Width / 2) + pCenter.X,
                            (acView.Height / 2) + pCenter.Y, 0);
                    }
                    //用直线创建范围对象
                    using (Line acLine = new Line(pMin, pMax))
                    {
                        eExtents = new Extents3d(acLine.Bounds.Value.MinPoint,
                            acLine.Bounds.Value.MaxPoint);
                    }
                    //计算当前视图的宽高比
                    double dViewRatio;
                    dViewRatio = (acView.Width / acView.Height);
                    //变换视图范围
                    matWCS2DCS = matWCS2DCS.Inverse();
                    eExtents.TransformBy(matWCS2DCS);
                    double dWidth;
                    double dHeight;
                    Point2d pNewCentPt;
                    //检查是否提供了中心点（中心模式和比例模式）
                    if (pCenter.DistanceTo(Point3d.Origin) != 0)
                    {
                        dWidth = acView.Width;
                        dHeight = acView.Height;
                        if (dFactor == 0)
                        {
                            pCenter = pCenter.TransformBy(matWCS2DCS);
                        }
                        pNewCentPt = new Point2d(pCenter.X, pCenter.Y);
                    }
                    else//窗口、范围和界限模式下
                    {
                        //计算当前视图的宽高新值；
                        dWidth = eExtents.MaxPoint.X - eExtents.MinPoint.X;
                        dHeight = eExtents.MaxPoint.Y - eExtents.MinPoint.Y;
                        //获取视图中心点
                        pNewCentPt = new Point2d(((eExtents.MaxPoint.X + eExtents.MinPoint.X) * 0.5),
                            ((eExtents.MaxPoint.Y + eExtents.MinPoint.Y) * 0.5));
                    }
                    //检查宽度新值是否适于当前窗口
                    if (dWidth > (dHeight * dViewRatio))
                        dHeight = dWidth / dViewRatio;
                    //调整视图大小
                    if (dFactor != 0)
                    {
                        acView.Height = dHeight * dFactor;
                        acView.Width = dWidth * dFactor;
                    }
                    //设置视图中心；
                    acView.CenterPoint = pNewCentPt;
                    //更新当前视图
                    acDoc.Editor.SetCurrentView(acView);
                }
                //提交更改
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 缩放窗口
        /// </summary>
        [CommandMethod("ZoomWindow")]
        public static void ZoomWindow()
        {
            //Zoom to a window boundary defined by 1.3,7.8 and 13.7,-2.6
            //缩放到由点(1.3，7.8)和点(13.7，-2.6)定义的窗口
            Point3d pMin = new Point3d(1.3, 7.8, 0);
            Point3d pMax = new Point3d(13.7, -2.6, 0);
            Zoom(pMin, pMax, new Point3d(), 1);
        }

        /// <summary>
        /// 按比例缩放视图
        /// </summary>
        [CommandMethod("ZoomScale")]
        static public void ZoomScale()
        {
            //获取当前文档
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.
                Application.DocumentManager.MdiActiveDocument;
            //获取当前视图
            using (ViewTableRecord acView = acDoc.Editor.GetCurrentView())
            {
                //获取当前视图中心
                Point3d pCenter = new Point3d(acView.CenterPoint.X,
                    acView.CenterPoint.Y, 0);
                //设置比例系数
                double dScale = 0.5;
                //基于当前视图中心按比例缩放视图
                Zoom(new Point3d(), new Point3d(), pCenter, 1 / dScale);
            }
        }

        /// <summary>
        /// 移动当前图形到指定中心点
        /// </summary>
        [CommandMethod("ZoomCenter")]
        public static void ZoomCenter()
        {
            //设置视图的中心点为(5,5,0)
            Zoom(new Point3d(), new Point3d(), new Point3d(5, 5, 0), 1);
        }

        //显示图形范围和界限
        //Extmin and Extmax    返回模型空间的范围
        //Pextmin and Pextmax  返回当前图纸空间布局的范围
        [CommandMethod("ZoomExtents")]
        public static void ZoomExtents()
        {
            //缩放到当前空间的范围
            Zoom(new Point3d(), new Point3d(), new Point3d(), 1.01075);
        }
        [CommandMethod("ZoomLimits")]
        public static void ZoomLimits()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.
                             Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //放到模型空间的界限
            Zoom(new Point3d(acCurDb.Limmin.X, acCurDb.Limmin.Y, 0),
                new Point3d(acCurDb.Limmax.X, acCurDb.Limmax.Y, 0),
                new Point3d(), 1);
        }

        /// <summary>
        /// 创建命名视图
        /// </summary>
        [CommandMethod("CreateNamedView")]
        public static void CreateNamedView()
        {
            //获取当前数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;

            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以只读模式打开View表
                ViewTable acViewTbl;
                acViewTbl = acTrans.GetObject(acCurDb.ViewTableId, OpenMode.ForRead) as ViewTable;

                //检查名为View1的视图是否存在
                if (acViewTbl.Has("View1") == false)
                {
                    //以只读模式打开View表
                    acViewTbl.UpgradeOpen();
                    //新建一个View表记录并命名为View1
                    ViewTableRecord acViewTblRec = new ViewTableRecord();
                    acViewTblRec.Name = "View1";
                    //添加到View表及事务
                    acViewTbl.Add(acViewTblRec);
                    acTrans.AddNewlyCreatedDBObject(acViewTblRec, true);

                    //置View1为当前视图
                    acDoc.Editor.SetCurrentView(acViewTblRec);

                    //提交修改
                    acTrans.Commit();
                }
            }
        }

        /// <summary>
        /// 删除命名空间
        /// </summary>
        [CommandMethod("EraseNamedView")]
        public static void EraseNamedView()
        {
            //获取当前数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.
                Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开View表
                ViewTable acViewTbl;
                acViewTbl = acTrans.GetObject(acCurDb.ViewTableId,
                    OpenMode.ForRead) as ViewTable;
                //检查名为“View1”的视图是否存在
                if (acViewTbl.Has("View1") == true)
                {
                    //以写模式打开View表
                    acViewTbl.UpgradeOpen();
                    //获取命名视图的记录
                    ViewTableRecord acViewTblRec;
                    acViewTblRec = acTrans.GetObject(acViewTbl["View1"],
                        OpenMode.ForWrite) as ViewTableRecord;
                    //从View表删除命名视图
                    acViewTblRec.Erase();
                    //提交修改
                    acTrans.Commit();
                }
            }
        }

        /// <summary>
        /// 创建一个有两个水平窗口的平铺视口配置
        /// </summary>
        [CommandMethod("CreateModelViewport")]
        public static void CteateModelViewport()
        {
            //获取当前数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.
                Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Viewport表
                ViewportTable acVportTbl;
                acVportTbl = acTrans.GetObject(acCurDb.ViewportTableId,
                    OpenMode.ForRead) as ViewportTable;
                //检查视图"TEST_VIEWPORT"是否存在
                if (acVportTbl.Has("TEST_VIEWPORT") == false)
                {
                    //以写模式打开Viewport表
                    acVportTbl.UpgradeOpen();
                    //添加新视口到Viewport表并添加事务记录
                    ViewportTableRecord acVportTblRecLwr = new ViewportTableRecord();
                    acVportTbl.Add(acVportTblRecLwr);
                    acTrans.AddNewlyCreatedDBObject(acVportTblRecLwr, true);
                    //新视口命名为”TEST_VIEWPORT“并将绘图窗口的下半部分赋给它
                    acVportTblRecLwr.Name = "TEST_VIEWPORT";
                    acVportTblRecLwr.LowerLeftCorner = new Point2d(0, 0);
                    acVportTblRecLwr.UpperRightCorner = new Point2d(1, 0.5);
                    //添加新视口到Viewport表并添加事务记录
                    ViewportTableRecord acVportTblRecUpr = new ViewportTableRecord();
                    acVportTbl.Add(acVportTblRecUpr);
                    acTrans.AddNewlyCreatedDBObject(acVportTblRecUpr, true);
                    //新视口命名为”TEST_VIEWPORT"并将绘图窗口的上半部分赋给它
                    acVportTblRecUpr.Name = "TEST_VIEWPORT";
                    acVportTblRecUpr.LowerLeftCorner = new Point2d(0, 0.5);
                    acVportTblRecUpr.UpperRightCorner = new Point2d(1, 1);
                    //将新视口设为活动视口，需要删除名为”*Active“的视口
                    //并基于”TEST_VIEWPORT“重建，遍历符号表里的每个对象
                    foreach (ObjectId acObjId in acVportTbl)
                    {
                        //以读模式打开对象
                        ViewportTableRecord acVportTblRec;
                        acVportTblRec = acTrans.GetObject(acObjId,
                            OpenMode.ForRead) as ViewportTableRecord;
                        //检查是否为活动视口，是就删除
                        if (acVportTblRec.Name == "*Active")
                        {
                            acVportTblRec.UpgradeOpen();
                            acVportTblRec.Erase();
                        }
                    }
                    //复制新视口为活动视口
                    foreach (ObjectId acObjId in acVportTbl)
                    {
                        //以读模式打开对象
                        ViewportTableRecord acVportTblRec;
                        acVportTblRec = acTrans.GetObject(acObjId,
                            OpenMode.ForRead) as ViewportTableRecord;
                        //检查是否为活动视口，是就删除
                        if (acVportTblRec.Name == "TEST_VIEWPORT")
                        {
                            ViewportTableRecord acVportTblRecClone;
                            acVportTblRecClone = acVportTblRec.Clone() as ViewportTableRecord; ;
                            //添加新视口到Viewport表并添加事务记录
                            acVportTbl.Add(acVportTblRecClone);
                            acVportTblRecClone.Name = "*Active";
                            acTrans.AddNewlyCreatedDBObject(acVportTblRecClone, true);
                        }
                    }
                    //用新的平铺视口排列更新显示
                    acDoc.Editor.UpdateTiledViewportsFromDatabase();
                    //提交修改
                    acTrans.Commit();
                }
            }
        }

        /// <summary>
        /// 分割视图并遍历
        /// </summary>
        [CommandMethod("SplitAndIterateModelViewports")]
        public static void SplitAndIterateModelViewports()
        {
            //获取当前数据库
            Document acDox = Autodesk.AutoCAD.ApplicationServices.
                Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDox.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以写模式打开Viewport表
                ViewportTable acVportTbl;
                acVportTbl = acTrans.GetObject(acCurDb.ViewportTableId,
                    OpenMode.ForWrite) as ViewportTable;

                //以写模式打开当前视口
                ViewportTableRecord acVportTblRec;
                acVportTblRec = acTrans.GetObject(acDox.Editor.ActiveViewportId,
                   OpenMode.ForWrite) as ViewportTableRecord;

                ViewportTableRecord acVportTblRecNew = new ViewportTableRecord();
                //添加新视口到Viewport表，记录事务
                acVportTbl.Add(acVportTblRecNew);
                acTrans.AddNewlyCreatedDBObject(acVportTblRecNew, true);
                //新视口的Name设置为"*Active"
                acVportTblRecNew.Name = "*Active";
                //用当前左下角作为新视口的左下角
                acVportTblRecNew.LowerLeftCorner = acVportTblRec.LowerLeftCorner;
                //获取当前右上角X值的一半
                acVportTblRecNew.UpperRightCorner = new Point2d(acVportTblRec.UpperRightCorner.X,
                    acVportTblRec.LowerLeftCorner.Y + ((acVportTblRec.UpperRightCorner.Y +
                    acVportTblRec.LowerLeftCorner.Y) / 2));
                //重新计算活动视口的两个角
                acVportTblRec.LowerLeftCorner = new Point2d(acVportTblRec.LowerLeftCorner.X,
                    acVportTblRecNew.UpperRightCorner.Y);
                //用新平铺视口布局更新显示
                acDox.Editor.UpdateTiledViewportsFromDatabase();
                //遍历视口表中的每个对象
                foreach (ObjectId acObjID in acVportTbl)
                {
                    //以读打开对象
                    ViewportTableRecord acVportTblRecCur;
                    acVportTblRecCur = acTrans.GetObject(acObjID,
                        OpenMode.ForRead) as ViewportTableRecord;
                    if (acVportTblRecCur.Name == "*Active")
                    {
                        Autodesk.AutoCAD.ApplicationServices.Application.
                            SetSystemVariable("CVPORT", acVportTblRecCur.Number);
                        Autodesk.AutoCAD.ApplicationServices.Application.
                            ShowAlertDialog("Viewport: " + acVportTblRecCur.Number +
                            " is now active." + "\nLower left corner: " +
                            acVportTblRecCur.LowerLeftCorner.X + ", " +
                            acVportTblRecCur.LowerLeftCorner.Y + "\nUpper right corner: " +
                            acVportTblRecCur.UpperRightCorner.X + ", " +
                            acVportTblRecCur.UpperRightCorner.Y);
                    }
                }
                //提交修改，关闭事务
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 改变文档窗口的几何信息
        /// </summary>
        public static void RewlyDrawing()
        {
            //重画图形
            Autodesk.AutoCAD.ApplicationServices.Application.UpdateScreen();
            Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor.UpdateScreen();

            //重新生成图形
            Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.
                Editor.Regen();

        }

        /// <summary>
        /// 创建新图形
        /// </summary>
        [CommandMethod("NewDrawing", CommandFlags.Session)]
        public static void NewDrawing()
        {
            //指定使用的样板，如果这个样板没找到，就使用默认设置
            string strTemplatePath = "acad.dwt";
            DocumentCollection acDocMgr = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager;
            Document acDoc = acDocMgr.Add(strTemplatePath);
            acDocMgr.MdiActiveDocument = acDoc;
        }

        /// <summary>
        /// 打开图形
        /// </summary>
        [CommandMethod("OpenDrawing", CommandFlags.Session)]
        public static void OpenDrawing()
        {
            string strFileName =
                "E:/VS2017/C#/CAD二次开发/CADDocument/MyDrawing1.dwg";
            DocumentCollection acDocMgr = Autodesk.AutoCAD.ApplicationServices.Application.
                    DocumentManager;
            if (File.Exists(strFileName))
            {
                acDocMgr.Open(strFileName, false);
            }
            else
            {
                acDocMgr.MdiActiveDocument.Editor.WriteMessage("File " + strFileName +
                    " does not exist.");
            }
        }

        /// <summary>
        /// 关闭图形文件
        /// </summary>
        [CommandMethod("CloseDrawing", CommandFlags.Session)]
        public static void CloseDrawing()
        {
            string strFileName =
                "E:/VS2017/C#/CAD二次开发/CADDocument/MyDrawing1.dwg";
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            //Database acCurDb = acDoc.Database;
            acDoc.CloseAndSave(strFileName);
        }

        /// <summary>
        /// 保存图形文件
        /// </summary>
        [CommandMethod("SaveActiveDrawing")]
        public static void SaveActiveDrawing()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            string strDWGName = acDoc.Name;
            object obj = Autodesk.AutoCAD.ApplicationServices.
                Application.GetSystemVariable("DWGTITLED");
            //图形命名了嘛？0-没呢
            if (System.Convert.ToInt16(obj) == 0)
            {
                //如果图形使用了默认名（Drawing1、Drawing2等）
                //就提供一个新文件名
                strDWGName = "d:\\MyDrawing.dwg";
            }
            //保存图形
            acDoc.Database.SaveAs(strDWGName, true, DwgVersion.Current, acDoc.Database.SecurityParameters);
        }

        /// <summary>
        /// 检查图形中是否有未保存的修改
        /// </summary>
        [CommandMethod("DrawingSaved")]
        public static void DrawingSaved()
        {
            object obj = Autodesk.AutoCAD.ApplicationServices.Application.
                    GetSystemVariable("DBMOD");
            //检查系统变量DBMOD的值，0表示没有未保存修改
            //检查系统变量DBMOD的值，0表示没有未保存修改
            if (System.Convert.ToInt16(obj) != 0)
            {
                if (System.Windows.Forms.MessageBox.Show("Do you wish to save this drawing?",
                    "Save Drawing", System.Windows.Forms.MessageBoxButtons.YesNo,
                    System.Windows.Forms.MessageBoxIcon.Question) ==
                    System.Windows.Forms.DialogResult.Yes)
                {
                    Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                        DocumentManager.MdiActiveDocument;
                    acDoc.Database.SaveAs(acDoc.Name, true, DwgVersion.Current,
                        acDoc.Database.SecurityParameters);
                }
            }
        }

        //为自定义应用程序菜单项创建命令处理器
        public class MyCommandHandler : System.Windows.Input.ICommand
        {
            public bool CanExecute(object parameter)
            {
                return true;
            }
            public event EventHandler CanExecuteChanged;
            public void Execute(object parameter)
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                        ShowAlertDialog("MyMenuItem has been clicked.");
            }
        }
        class Chp02_3_3
        {
            //Global var for ZeroDocState 全局变量
            ApplicationMenuItem acApMenuItem = null;

            [CommandMethod("AddZeroDocEvent")]
            public void AddZeroDocEvent()
            {
                //获取DocumentCollection并注册DocumentDestroyed时间
                DocumentCollection acDocMgr = Autodesk.AutoCAD.ApplicationServices.
                    Application.DocumentManager;
                acDocMgr.DocumentDestroyed += new DocumentDestroyedEventHandler(docDestroyed);
            }
            public void docDestroyed(object obj, DocumentDestroyedEventArgs acDocDesEvtArgs)
            {
                //确定菜单项是否已存在
                //确定打开的文档数
                if (Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.Count == 1 &&
                    acApMenuItem == null)
                {
                    //添加事务处理器来守候应用程序菜单
                    //记着添加引用AdWindows.dll啊~
                    ComponentManager.ApplicationMenu.Opening +=
                        new EventHandler<EventArgs>(ApplicationMenu_Opening);
                }
            }
            void ApplicationMenu_Opening(object sender, EventArgs e)
            {
                //检查菜单项，看看之前添加过嘛
                if (acApMenuItem == null)
                {
                    //获取应用程序菜单组件
                    ApplicationMenu acApMenu = ComponentManager.ApplicationMenu;
                    //创建新菜单项
                    acApMenuItem = new ApplicationMenuItem();
                    acApMenuItem.CommandHandler = new MyCommandHandler();

                    //追加新菜单项
                    acApMenu.MenuContent.Items.Add(acApMenuItem);
                    //移除事件处理器
                    ComponentManager.ApplicationMenu.Opening -=
                        new EventHandler<EventArgs>(ApplicationMenu_Opening);
                }
            }
        }

        /// <summary>
        /// 修改对象前锁定数据库
        /// </summary>
        [CommandMethod("LockDoc", CommandFlags.Session)]
        public static void LockDoc()
        {
            //新建图形
            DocumentCollection acDocMgr = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager;
            Document acNewDoc = acDocMgr.Add("acad.dwt");
            Database acDbNewDoc = acNewDoc.Database;
            //锁定新文档
            using (DocumentLock acLckDoc = acNewDoc.LockDocument())
            {
                //启动新数据库事务
                using (Transaction acTrans =
                    acDbNewDoc.TransactionManager.StartTransaction())
                {
                    //以读模式打开块表
                    BlockTable acBlkTbl;
                    acBlkTbl = acTrans.GetObject(acDbNewDoc.BlockTableId,
                        OpenMode.ForRead) as BlockTable;
                    //以写模式打开块表记录模型空间
                    BlockTableRecord acBlkTblRec;
                    acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                        OpenMode.ForWrite) as BlockTableRecord;
                    //在（5，5）创建一个半径为3的圆
                    Circle acCirc = new Circle();
                    acCirc.Center = new Point3d(5, 5, 0);
                    acCirc.Radius = 3;
                    //添加新对象到模型空间和事务
                    acBlkTblRec.AppendEntity(acCirc);
                    acTrans.AddNewlyCreatedDBObject(acCirc, true);
                    //提交修改
                    acTrans.Commit();
                }
                //解锁文档（Using 语句到此结束)
            }
            //将新文档置为当前
            acDocMgr.MdiActiveDocument = acNewDoc;
        }

        /// <summary>
        /// 设置十字光标为全屏幕
        /// </summary>
        [CommandMethod("PrefsSetCursor")]
        public static void PrefsSetCursor()
        {
            //本示例设置绘图窗口的十字光标为全屏
            //获得Preferences对象
            AcadPreferences acPrefComObj = (AcadPreferences)Autodesk.AutoCAD.ApplicationServices.
                Application.Preferences;
            //使用CursorSize属性设置十字光标的大小
            acPrefComObj.Display.CursorSize = 100;
        }

        /// <summary>
        /// 隐藏滚动条
        /// </summary>
        [CommandMethod("PrefsSetDisplay")]
        public static void PrefsSetDisplay()
        {
            //本例使滚动条失效
            //获得Preferences对象
            AcadPreferences acPrefComObj = (AcadPreferences)Autodesk.AutoCAD.ApplicationServices.
                Application.Preferences;
            //不显示滚动条
            acPrefComObj.Display.DisplayScrollBars = false;
        }

        public class Class_FunGridSnap
        {
            [CommandMethod("ChangeGridAndSnap")]
            public static void ChangeGridAndSnap()
            {
                //获取当前数据库
                Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                    DocumentManager.MdiActiveDocument;
                Database acCurDb = acDoc.Database;
                //启动事务
                using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
                {
                    //打开当前视口
                    ViewportTableRecord acVportTblRec;
                    acVportTblRec = acTrans.GetObject(acDoc.Editor.ActiveViewportId,
                        OpenMode.ForWrite) as ViewportTableRecord;
                    //打开栅格
                    acVportTblRec.GridEnabled = true;
                    //调整栅格间距为1，1
                    acVportTblRec.GridIncrements = new Point2d(1, 1);
                    //打开当前视口的捕捉模式
                    acVportTblRec.SnapEnabled = true;
                    //调整捕捉间距为0.5，0.5
                    acVportTblRec.SnapIncrements = new Point2d(0.5, 0.5);
                    //修改捕捉旋转角度为30度（0.524弧度）
                    acVportTblRec.SnapAngle = 0.524;
                    //更新平铺视口的显示
                    acDoc.Editor.UpdateTiledViewportsFromDatabase();
                    //提交修改，关闭事务
                    acTrans.Commit();
                }
            }
        }

        /// <summary>
        /// 获取相对于x轴的角度
        /// </summary>
        [CommandMethod("AngleFromXAxis")]
        public static void AngleFromXAxis()
        {
            Point2d pt1 = new Point2d(2, 5);
            Point2d pt2 = new Point2d(5, 2);

            Autodesk.AutoCAD.ApplicationServices.Application.
                ShowAlertDialog("Angle from XAxis: " + pt1.GetVectorTo(pt2).Angle.ToString());
        }

        static Point2d PolarPoints(Point2d pPt, double dAng, double dDist)
        {
            return new Point2d(pPt.X + dDist * Math.Cos(dAng),
                pPt.Y + dDist * Math.Sin(dAng));
        }
        static Point3d PolarPoints(Point3d pPt, double dAng, double dDist)
        {
            return new Point3d(pPt.X + dDist * Math.Cos(dAng),
                pPt.Y + dDist * Math.Sin(dAng),
                pPt.Z);
        }
        [CommandMethod("PolarPoints")]
        public static void PolarPoints()
        {
            Point2d pt1 = PolarPoints(new Point2d(5, 2), 0.785398, 12);
            Autodesk.AutoCAD.ApplicationServices.Application.
                ShowAlertDialog("\nPolarPoint: " +
                "\nX=" + pt1.X + "\nY=" + pt1.Y);
            Point3d pt2 = PolarPoints(new Point3d(5, 2, 0), 0.785398, 12);
            Autodesk.AutoCAD.ApplicationServices.Application.
                ShowAlertDialog("\nPolarPoint: " + "\nX=" + pt2.X + "\nY=" + pt2.Y +
                "\nZ=" + pt2.Z);
        }

        /// <summary>
        /// 用Distance()计算两点间距离
        /// </summary>
        [CommandMethod("GetDistanceBetweenTwoPoints")]
        public static void GetDistanceBetweenTwoPoints()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            PromptDoubleResult pDbRes;
            pDbRes = acDoc.Editor.GetDistance("\nPick two points: ");
            Autodesk.AutoCAD.ApplicationServices.Application.
                ShowAlertDialog("\nDistance between points: " + pDbRes.Value.ToString());
        }

        /// <summary>
        /// 计算由用户输入点定义的面积
        /// </summary>
        [CommandMethod("CalculateDefinedArea")]
        public static void CalculateDefinedArea()
        {
            //提示用户输入5个点
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            PromptPointResult pPtRes;
            Point2dCollection colPt = new Point2dCollection();
            PromptPointOptions pPtOpts = new PromptPointOptions("");
            //提示输入第一个点
            pPtOpts.Message = "\nSpecify first point: ";
            pPtRes = acDoc.Editor.GetPoint(pPtOpts);
            colPt.Add(new Point2d(pPtRes.Value.X, pPtRes.Value.Y));
            //如果用户按ESC键或取消命令就退出
            if (pPtRes.Status == PromptStatus.Cancel)
                return;
            int nCounter = 1;
            while (nCounter <= 4)
            {
                //提示下一个点
                switch (nCounter)
                {
                    case 1:
                        pPtOpts.Message = "\nSpecify second point: ";
                        break;
                    case 2:
                        pPtOpts.Message = "\nSpecify third point: ";
                        break;
                    case 3:
                        pPtOpts.Message = "\nSpecify fourth point: ";
                        break;
                    case 4:
                        pPtOpts.Message = "\nSpecify fifth point: ";
                        break;
                }
                //用前一个点作为基点
                pPtOpts.UseBasePoint = true;
                pPtOpts.BasePoint = pPtRes.Value;

                pPtRes = acDoc.Editor.GetPoint(pPtOpts);
                colPt.Add(new Point2d(pPtRes.Value.X, pPtRes.Value.Y));
                if (pPtRes.Status == PromptStatus.Cancel)
                    return;
                //计数加1
                nCounter = nCounter + 1;
            }
            //用5个点创建多段线
            //所有的2D实体对象和3D实体对象都实现了IDisposable,故可以使用using语句
            using (Polyline acPoly = new Polyline())
            {
                acPoly.AddVertexAt(0, colPt[0], 0, 0, 0);
                acPoly.AddVertexAt(1, colPt[1], 0, 0, 0);
                acPoly.AddVertexAt(2, colPt[2], 0, 0, 0);
                acPoly.AddVertexAt(3, colPt[3], 0, 0, 0);
                acPoly.AddVertexAt(4, colPt[4], 0, 0, 0);
                //闭合多段线
                acPoly.Closed = true;
                //查询多段线面积
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Area of polyline: " + acPoly.Area.ToString());
            }
            //销毁多段线
        }

        /// <summary>
        /// 从AutoCAD命令行获取用户输入的字符串--GetString()
        /// </summary>
        [CommandMethod("GetStringFromUser")]
        public static void GetStringFromUser()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            PromptStringOptions pStrOpts = new PromptStringOptions("\nEnter your name: ");
            pStrOpts.AllowSpaces = true;
            PromptResult pStrRes = acDoc.Editor.GetString(pStrOpts);

            Autodesk.AutoCAD.ApplicationServices.Application.
                ShowAlertDialog("The name entered was: " + pStrRes.StringResult);
        }

        /// <summary>
        /// 获取用户选取的点---GetPoint()
        /// </summary>
        [CommandMethod("GetPointsFromUser")]
        public static void GetPointsFromUser()
        {
            //获取当前数据库，启动事务管理器
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            PromptPointResult pPtRes;
            PromptPointOptions pPtOpts = new PromptPointOptions("");
            //提示起点
            pPtOpts.Message = "\nEnter the start point of the line: ";
            pPtRes = acDoc.Editor.GetPoint(pPtOpts);
            Point3d ptStart = pPtRes.Value;
            //如果用户按ESC键或取消命令，就退出
            if (pPtRes.Status == PromptStatus.Cancel)
                return;
            //提示终点
            pPtOpts.Message = "\nEnter the end point of the line: ";
            pPtOpts.UseBasePoint = true;
            pPtOpts.BasePoint = ptStart;
            pPtRes = acDoc.Editor.GetPoint(pPtOpts);
            Point3d ptEnd = pPtRes.Value;

            if (pPtRes.Status == PromptStatus.Cancel)
                return;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                BlockTable acBlkTbl;
                BlockTableRecord acBlkTblRec;
                //以写模式打开模型空间
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建直线
                Line acLine = new Line(ptStart, ptEnd);
                //添加直线
                acBlkTblRec.AppendEntity(acLine);
                acTrans.AddNewlyCreatedDBObject(acLine, true);
                //缩放图形到全部显示
                acDoc.SendStringToExecute("._zoom _all", true, false, false);
                //提交修改，关闭事务
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 从命令行中获取关键字
        /// </summary>
        [CommandMethod("GetKeywordFromUser2")]
        public static void GetKeywordFromUser2()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            PromptKeywordOptions pKeyOpts = new PromptKeywordOptions("");
            pKeyOpts.Message = "\nEnter an option ";
            pKeyOpts.Keywords.Add("Line");
            pKeyOpts.Keywords.Add("Circle");
            pKeyOpts.Keywords.Add("Arc");
            pKeyOpts.AllowNone = true;

            PromptResult pKeyRes = acDoc.Editor.GetKeywords(pKeyOpts);
            Autodesk.AutoCAD.ApplicationServices.Application.
                ShowAlertDialog("Entered keyword: " + pKeyRes.StringResult);
        }

        /// <summary>
        /// 限制用户输入
        /// </summary>
        [CommandMethod("GetIntegerOrKeywordFromUser")]
        public static void GetIntegerOrKeywordFromUser()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            PromptIntegerOptions pIntOpts = new PromptIntegerOptions("");
            pIntOpts.Message = "\nEnter the size or ";
            //限制输入必须大于0
            pIntOpts.AllowZero = false;
            pIntOpts.AllowNegative = false;
            //定义合法关键字并允许直接按Enter键
            pIntOpts.Keywords.Add("Big");
            pIntOpts.Keywords.Add("Small");
            pIntOpts.Keywords.Add("Regular");
            pIntOpts.Keywords.Default = "Regular";
            pIntOpts.AllowNone = true;
            //获取用户键入的值
            PromptIntegerResult pIntRes = acDoc.Editor.GetInteger(pIntOpts);
            if (pIntRes.Status == PromptStatus.Keyword)
            {
                Autodesk.AutoCAD.ApplicationServices.Application.ShowAlertDialog("Entered keyword: " +
                    pIntRes.StringResult);
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.ShowAlertDialog("Entered value: " +
                    pIntRes.Value.ToString());
            }
        }

        /// <summary>
        /// 发送一个命令到AutoCAD命令行
        /// </summary>
        [CommandMethod("SendACommandToAutoCAD")]
        public static void SendACommandToAutoCAD()
        {
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            //画圆并缩放到图形界限
            acDoc.SendStringToExecute("._circle 2,2,0 4 ", true, false, false);
            acDoc.SendStringToExecute("._zoom _all ", true, false, false);
        }

        /// <summary>
        /// 使用事务打开并查询对象
        /// </summary>
        [CommandMethod("OpenTransactionManager")]
        public static void OpenTransactionManager()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以读模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForRead) as BlockTableRecord;
                //遍历块表记录
                foreach (ObjectId asObjId in acBlkTblRec)
                {
                    acDoc.Editor.WriteMessage("\nDXF name: " + asObjId.ObjectClass.DxfName);
                    acDoc.Editor.WriteMessage("\nObjectID: " + asObjId.ToString());
                    acDoc.Editor.WriteMessage("\nHandle: " + asObjId.Handle.ToString());
                    acDoc.Editor.WriteMessage("\n");
                }
            }//关闭事务
        }


        /// <summary>
        /// 使用事务向数据库添加对象
        /// </summary>
        [CommandMethod("AddNewCircleTransaction")]
        public static void AddNewCircleTransaction()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //以半径3圆心5，5画圆
                Circle acCirc = new Circle();
                acCirc.Center = new Point3d(5, 5, 0);
                acCirc.Radius = 3;
                //将新对象添加到Model空间并进行事务登记
                acBlkTblRec.AppendEntity(acCirc);
                acTrans.AddNewlyCreatedDBObject(acCirc, true);
                //提交修改并关闭事务
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 使用嵌套事务创建对象
        /// </summary>
        [CommandMethod("NestedTransactions")]
        public static void NestedTransactions()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //创建对事务管理器的引用
            Autodesk.AutoCAD.DatabaseServices.TransactionManager acTransMgr;
            acTransMgr = acCurDb.TransactionManager;
            //新建事务
            using (Transaction acTrans1 = acTransMgr.StartTransaction())
            {
                //打印当前活动事务的个数
                acDoc.Editor.WriteMessage("\nNumber of transaction active: " +
                    acTransMgr.NumberOfActiveTransactions.ToString());
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans1.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans1.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建半径2 圆心5,5的圆
                Circle acCirc = new Circle();
                acCirc.Center = new Point3d(5, 5, 0);
                acCirc.Radius = 3;
                //添加新对象到模型空间并添加新事务
                acBlkTblRec.AppendEntity(acCirc);
                acTrans1.AddNewlyCreatedDBObject(acCirc, true);
                //创建第2个事务
                using (Transaction acTrans2 = acTransMgr.StartTransaction())
                {
                    acDoc.Editor.WriteMessage("\nNumber of transaction actives: " +
                        acTransMgr.NumberOfActiveTransactions.ToString());
                    //修改圆的颜色
                    acCirc.ColorIndex = 5;
                    //新建一天直线
                    Line acLine = new Line(new Point3d(2, 5, 0), new Point3d(10, 7, 0));
                    acLine.ColorIndex = 3;
                    //将直线对象添加到Model空间并进行事务登记（事务2）
                    acBlkTblRec.AppendEntity(acLine);
                    acTrans2.AddNewlyCreatedDBObject(acLine, true);
                    //创建第3个事务
                    using (Transaction acTrans3 = acTransMgr.StartTransaction())
                    {
                        acDoc.Editor.WriteMessage("\nNumber of transactions active: " +
                            acTransMgr.NumberOfActiveTransactions.ToString());
                        //修改圆的颜色
                        acCirc.ColorIndex = 3;
                        //更新图形显示
                        acDoc.Editor.WriteMessage("\n");
                        acDoc.Editor.Regen();
                        //询问保留还是取消第3个事务中的修改
                        PromptKeywordOptions pKeyOpts = new PromptKeywordOptions("");
                        pKeyOpts.Message = "\nKeep color change ";
                        pKeyOpts.Keywords.Add("Yes");
                        pKeyOpts.Keywords.Add("No");
                        pKeyOpts.Keywords.Default = "No";
                        pKeyOpts.AllowNone = true;

                        PromptResult pKeyRes = acDoc.Editor.GetKeywords(pKeyOpts);
                        if (pKeyRes.StringResult == "No")
                        {
                            //取消事务3中的修改
                            acTrans3.Abort();
                        }
                        else
                        {
                            //保存事务3中的修改
                            acTrans3.Commit();
                        }
                        acDoc.Editor.WriteMessage("\nNumber of transactions active: " +
                            acTransMgr.NumberOfActiveTransactions.ToString());
                        //保留事务2中的修改
                        acTrans2.Commit();
                    }
                    acDoc.Editor.WriteMessage("\nNumber of transactions active: " +
                        acTransMgr.NumberOfActiveTransactions.ToString());
                    //保留事务1中的修改
                    acTrans1.Commit();
                }
            }
        }

        /// <summary>
        /// 使用事务查询对象
        /// </summary>
        [CommandMethod("OpenCloseObjectId")]
        public static void OpenCloseObjectId()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.
                MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //以读模式打开Block表
            BlockTable acBlkTbl;
            acBlkTbl = acCurDb.BlockTableId.Open(OpenMode.ForRead) as BlockTable;
            //以读模式打开模型空间记录
            BlockTableRecord acBlkTblRec;
            acBlkTblRec = acBlkTbl[BlockTableRecord.ModelSpace].Open(OpenMode.ForRead) as BlockTableRecord;
            //遍历块表记录
            foreach (ObjectId acObjId in acBlkTblRec)
            {
                acDoc.Editor.WriteMessage("\nDXF name: " + acObjId.ObjectClass.DxfName);
                acDoc.Editor.WriteMessage("\nObjectID: " + acObjId.ToString());
                acDoc.Editor.WriteMessage("\nHandle: " + acObjId.Handle.ToString());
                acDoc.Editor.WriteMessage("\n");
            }
            //关闭块表记录
            acBlkTblRec.Close();
            acBlkTblRec.Dispose();
            //关闭块表
            acBlkTbl.Close();
            acBlkTbl.Dispose();
        }


        /// <summary>
        /// 以通知方式打开对象
        /// </summary>
        [CommandMethod("FreezeDoorLayer")]
        public static void FreezeDoorLayer()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开图层表
                LayerTable acLyrTbl;
                acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
                    OpenMode.ForRead) as LayerTable;
                //遍历图层，将图层名以“Door”开头的图层升级为写打开
                foreach (ObjectId acObjId in acLyrTbl)
                {
                    //以读模式打开图层表记录以读打开图层表记录
                    LayerTableRecord acLyrTblRec;
                    acLyrTblRec = acTrans.GetObject(acObjId,
                        OpenMode.ForRead) as LayerTableRecord;
                    //检查图层名是否以“Door”开头
                    if (acLyrTblRec.Name.StartsWith("Door",
                        StringComparison.OrdinalIgnoreCase) == true)
                    {
                        //检查是否为当前层
                        if (acLyrTblRec.ObjectId != acCurDb.Clayer)
                        {
                            //升级打开模式
                            acLyrTblRec.UpgradeOpen();
                            //冻结图层
                            acLyrTblRec.IsFrozen = true;
                        }
                    }
                }
                //提交修改并关闭事务
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 访问模型/图纸空间
        /// </summary>
        [CommandMethod("AccessSpace")]
        public static void AccessSpace()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以读模式打开块表表记录
                BlockTableRecord acBlkTblRec;
                //打开的是哪个块表记录？
                PromptKeywordOptions pKeyOpts = new PromptKeywordOptions("");
                pKeyOpts.Message = "\nEnter which space to create the line in ";
                pKeyOpts.Keywords.Add("Model");
                pKeyOpts.Keywords.Add("Paper");
                pKeyOpts.Keywords.Add("Current");
                pKeyOpts.AllowNone = false;
                pKeyOpts.AppendKeywordsToMessage = true;

                PromptResult pKeyRes = acDoc.Editor.GetKeywords(pKeyOpts);

                if (pKeyRes.StringResult == "Model")
                {
                    //从Block表获取Model空间的ObjectID
                    acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                        OpenMode.ForWrite) as BlockTableRecord;
                }
                else if (pKeyRes.StringResult == "Paper")
                {
                    //从Block表获取Paper空间的ObjectID
                    acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.PaperSpace],
                        OpenMode.ForWrite) as BlockTableRecord;
                }
                else
                {
                    //从数据库获取当前空间的ObjectID
                    acBlkTblRec = acTrans.GetObject(acCurDb.CurrentSpaceId,
                        OpenMode.ForWrite) as BlockTableRecord;
                }
                //从（2，5）到（10，7）画一条直线
                Line acLine = new Line(new Point3d(2, 5, 0),
                    new Point3d(10, 7, 0));
                //添加新对象到块表记录并添加事务
                acBlkTblRec.AppendEntity(acLine);
                acTrans.AddNewlyCreatedDBObject(acLine, true);
                //保存新直线到数据库
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 创建一条直线
        /// </summary>
        [CommandMethod("AddLine")]
        public static void AddLine()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //Create a line
                Line acLine = new Line(new Point3d(5, 5, 0),
                    new Point3d(12, 3, 0));
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(acLine);
                acTrans.AddNewlyCreatedDBObject(acLine, true);
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 创建一个Polyline对象
        /// </summary>
        [CommandMethod("AddLightweightPolyline")]
        public static void AddLightweightPolyline()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //Create a polyline with two segments(3 points)
                Polyline acPoly = new Polyline();
                acPoly.AddVertexAt(0, new Point2d(2, 4), 0, 0, 0);
                acPoly.AddVertexAt(1, new Point2d(4, 2), 0, 0, 0);
                acPoly.AddVertexAt(2, new Point2d(6, 4), 0, 0, 0);
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(acPoly);
                acTrans.AddNewlyCreatedDBObject(acPoly, true);
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 添加一个圆
        /// </summary>
        [CommandMethod("AddCircle")]
        public static void AddCircle()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建圆，圆心（2，3），半径4.25
                Circle acCirc = new Circle();
                acCirc.Center = new Point3d(2, 3, 0);
                acCirc.Radius = 4.25;
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(acCirc);
                acTrans.AddNewlyCreatedDBObject(acCirc, true);
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 添加圆弧
        /// </summary>
        [CommandMethod("AddArc")]
        public static void AddArc()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //已知圆心、半径、起止角，创建圆弧
                Arc acArc = new Arc(new Point3d(6.25, 9.125, 0),
                    6, 1.117, 3.5605);
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(acArc);
                acTrans.AddNewlyCreatedDBObject(acArc, true);
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }



        /// <summary>
        /// 创建样条曲线
        /// </summary>
        [CommandMethod("AddSpline")]
        public static void AddSpline()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //定义样条曲线的拟合点
                Point3dCollection ptColl = new Point3dCollection();
                ptColl.Add(new Point3d(0, 0, 0));
                ptColl.Add(new Point3d(5, 5, 0));
                ptColl.Add(new Point3d(10, 0, 0));
                //获取点（0.5，0.5，0）的3D矢量
                Vector3d vecTan = new Point3d(0.5, 0.5, 0).GetAsVector();
                //创建通过3个点的样条曲线，且起止点的切线方向为(0.5,0.5,0);
                //注：在公差值设置为0.0时（第5个参数),样条曲线直接通过拟合点
                Spline acSpline = new Spline(ptColl, vecTan, vecTan, 4, 0.0);
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(acSpline);
                acTrans.AddNewlyCreatedDBObject(acSpline, true);
                //保存新对象到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 创建一个点对象并修改其形状
        /// </summary>
        [CommandMethod("AddPointAndSetPointStyle")]
        public static void AddPointAndSetPointStyle()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //在Model空间创建点（4，3，0）
                DBPoint acPoint = new DBPoint(new Point3d(4, 3, 0));
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(acPoint);
                acTrans.AddNewlyCreatedDBObject(acPoint, true);
                //设置图形中所有点的样式
                acCurDb.Pdmode = 34;
                acCurDb.Pdsize = 1;
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 创建一个实体填充对象
        /// </summary>
        [CommandMethod("Add2DSolid")]
        public static void Add2DSolid()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //在Model空间创建四边形实体（蝴蝶结）
                Solid ac2DSolidBow = new Solid(new Point3d(0, 0, 0),
                    new Point3d(5, 0, 0),
                    new Point3d(5, 8, 0),
                    new Point3d(0, 8, 0));
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(ac2DSolidBow);
                acTrans.AddNewlyCreatedDBObject(ac2DSolidBow, true);
                //在Model空间创建矩形实体
                Solid ac2DSolidSqr = new Solid(new Point3d(10, 0, 0),
                    new Point3d(15, 0, 0),
                    new Point3d(10, 8, 0),
                    new Point3d(15, 8, 0));
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(ac2DSolidSqr);
                acTrans.AddNewlyCreatedDBObject(ac2DSolidSqr, true);
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 创建一个简单面域
        /// </summary>
        [CommandMethod("AddRegion")]
        public static void AddRegion()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block块表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //在内存创建一个圆
                using (Circle acCirc = new Circle())
                {
                    acCirc.Center = new Point3d(2, 2, 0);
                    acCirc.Radius = 5;
                    //将圆添加到对象数组
                    DBObjectCollection acDBObjColl = new DBObjectCollection();
                    acDBObjColl.Add(acCirc);
                    //基于每个闭环计算面域
                    DBObjectCollection myRegionColl = new DBObjectCollection();
                    myRegionColl = Autodesk.AutoCAD.DatabaseServices.Region.CreateFromCurves(acDBObjColl);
                    Autodesk.AutoCAD.DatabaseServices.Region acRegion = myRegionColl[0] as Autodesk.AutoCAD.DatabaseServices.Region;
                    //将新对象添加到块表记录和事务
                    acBlkTblRec.AppendEntity(acRegion);
                    acTrans.AddNewlyCreatedDBObject(acRegion, true);
                    //处置内存中的圆，不添加到数据库
                }
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 创建组合面域
        /// </summary>
        [CommandMethod("CreateCompositionRegions")]
        public static void CreateCompositeRegions()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //在内存建两个圆
                Circle acCirc1 = new Circle();
                acCirc1.Center = new Point3d(4, 4, 0);
                acCirc1.Radius = 2;

                Circle acCirc2 = new Circle();
                acCirc2.Center = new Point3d(4, 4, 0);
                acCirc2.Radius = 1;
                //将圆添加到对象数组
                DBObjectCollection acDBObjColl = new DBObjectCollection();
                acDBObjColl.Add(acCirc1);
                acDBObjColl.Add(acCirc2);
                //基于每个闭环计算面域
                DBObjectCollection myRegionColl = new DBObjectCollection();
                myRegionColl = Autodesk.AutoCAD.DatabaseServices.Region.
                    CreateFromCurves(acDBObjColl);
                Autodesk.AutoCAD.DatabaseServices.Region acRegion1 = myRegionColl[0] as Autodesk.AutoCAD.DatabaseServices.Region;
                Autodesk.AutoCAD.DatabaseServices.Region acRegion2 = myRegionColl[1] as
                    Autodesk.AutoCAD.DatabaseServices.Region;
                //从面域2减去面域1
                if (acRegion1.Area > acRegion2.Area)
                {
                    //从较大面域中减去较小面域
                    acRegion1.BooleanOperation(BooleanOperationType.BoolSubtract, acRegion2);
                    acRegion2.Dispose();
                    //将最终的面域添加到数据库
                    acBlkTblRec.AppendEntity(acRegion1);
                    acTrans.AddNewlyCreatedDBObject(acRegion1, true);
                }
                else
                {
                    //从较大面域中减去较小面域
                    acRegion2.BooleanOperation(BooleanOperationType.BoolSubtract, acRegion1);
                    acRegion1.Dispose();
                    //将最终的面域添加到数据库
                    acBlkTblRec.AppendEntity(acRegion2);
                    acTrans.AddNewlyCreatedDBObject(acRegion2, true);
                }
                //销毁内存中的两个圆对象
                acCirc1.Dispose();
                acCirc2.Dispose();
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 创建Hatch对象
        /// </summary>
        [CommandMethod("AddHatch")]
        public static void AddHatch()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建一个圆作为填充的封闭边界
                Circle acCirc = new Circle();
                acCirc.Center = new Point3d(3, 3, 0);
                acCirc.Radius = 1;
                //将圆添加到块表记录和事务
                acBlkTblRec.AppendEntity(acCirc);
                acTrans.AddNewlyCreatedDBObject(acCirc, true);
                //将圆的ObjectId添加到对象数组
                ObjectIdCollection acObjIdColl = new ObjectIdCollection();
                acObjIdColl.Add(acCirc.ObjectId);
                //创建填充对象并添加到块表记录
                Hatch acHatch = new Hatch();
                acBlkTblRec.AppendEntity(acHatch);
                acTrans.AddNewlyCreatedDBObject(acHatch, true);
                //设置填充对象的属性
                //在调用AppendLoop之前设置填充对象的关联属性
                acHatch.SetHatchPattern(HatchPatternType.PreDefined, "ANSI31");
                acHatch.Associative = true;
                acHatch.AppendLoop(HatchLoopTypes.Outermost, acObjIdColl);
                acHatch.EvaluateHatch(true);
                //将新对象保存到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 获取PickFirst选择集
        /// </summary>
        [CommandMethod("ChenkForPickfirstSelection", CommandFlags.UsePickSet)]
        public static void CheckForPickfirstSelection()
        {
            //获取当前文档
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //获取PickFirst选择集
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.SelectImplied();
            SelectionSet acSSet;
            //如果提示状态OK，说明启动命令前选择了对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.ShowAlertDialog("Number of objects in Pickfirst selection: " +
                    acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects in Pickfirst selection of: 0");
            }
            //清空PickFirst选择集
            ObjectId[] idarrayEmpty = new ObjectId[0];
            acDocEd.SetImpliedSelection(idarrayEmpty);
            //请求从图形区域选择对象
            acSSPrompt = acDocEd.GetSelection();
            //如果提示状态OK，表示已选择对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " +
                    acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: 0");
            }
        }

        /// <summary>
        /// 提示选择屏幕上的对象并遍历选择集
        /// </summary>
        [CommandMethod("SelectObjectsOnscreen")]
        public static void SelectObjectOnscreen()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //请求在图形区域选择对象
                PromptSelectionResult acSSPrompt = acDoc.Editor.GetSelection();
                //如果提示状态OK，表示已选择对象
                if (acSSPrompt.Status == PromptStatus.OK)
                {
                    SelectionSet acSSet = acSSPrompt.Value;
                    //遍历选择集内的对象
                    foreach (SelectedObject acSSObj in acSSet)
                    {
                        //确认返回的是合法的SelectedObject对象
                        if (acSSObj != null)
                        {
                            //以写模式打开所选对象
                            Entity acEnt = acTrans.GetObject(acSSObj.ObjectId,
                                OpenMode.ForWrite) as Entity;
                            if (acEnt != null)
                            {
                                //将对象颜色修改为绿色
                                acEnt.ColorIndex = 3;
                            }
                        }
                    }
                    //保存新对象到数据库
                    acTrans.Commit();
                }
            }
        }

        /// <summary>
        /// 选择与窗口相交的对象
        /// </summary>
        [CommandMethod("SelectObjectsByCrossingWindow")]
        public static void SelectObjectsByCrossingWindow()
        {
            //获取当前文档编辑器
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //从(2,2,0)到(10,8,0)创建一个交叉窗口
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.SelectCrossingWindow(new Point3d(2, 2, 0),
                new Point3d(10, 8, 0));
            //如果提示状态OK，表示已选择对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " + acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: 0");
            }
        }

        /// <summary>
        /// 将所选对象添加到选择集
        /// </summary>
        [CommandMethod("MergeSelectionSets")]
        public static void MergeSelectionSets()
        {
            //获取当前文档编辑器
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //请求在图形区域选择对象
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.GetSelection();
            SelectionSet acSSet1;
            ObjectIdCollection acObjIdColl = new ObjectIdCollection();
            //如果提示状态是OK，表示已选择对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                //获取所选对象
                acSSet1 = acSSPrompt.Value;
                //向ObjectIdCollection中追加选择集1的对象
                acObjIdColl = new ObjectIdCollection(acSSet1.GetObjectIds());
            }
            //请求在图形区域选择对象
            acSSPrompt = acDocEd.GetSelection();
            SelectionSet acSSet2;
            //如果提示状态OK，表示已选择对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                acSSet2 = acSSPrompt.Value;
                //检查ObjectIdCollection集合大小，如果为0就用选择集2对其初始化
                if (acObjIdColl.Count == 0)
                {
                    acObjIdColl = new ObjectIdCollection(acSSet2.GetObjectIds());
                }
                else
                {
                    //遍历选择集2
                    foreach (ObjectId acObjId in acSSet2.GetObjectIds())
                    {
                        //将第二个选择集中的每个对象添加到集合内
                        acObjIdColl.Add(acObjId);
                    }
                }
            }
            Autodesk.AutoCAD.ApplicationServices.Application.
                ShowAlertDialog("Number of objects selected: " +
                acObjIdColl.Count.ToString());
        }

        /// <summary>
        /// 为选择集制定选择条件
        /// </summary>
        [CommandMethod("FilterSelectionSet")]
        public static void FilterSelectionSet()
        {
            //获取当前文档编辑器
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //创建一个TypedValue数组来定义过滤器条件
            TypedValue[] acTypValAr = new TypedValue[1];
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "CIRCLE"), 0);
            //将过滤器条件赋值给SelectionFilter对象
            SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);
            //请求用户在图形区域选择对象
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.GetSelection(acSelFtr);
            //提示状态OK，表示已选择对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " +
                    acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected： 0");
            }
        }

        /// <summary>
        /// 选择满足两个过滤条件的对象
        /// </summary>
        [CommandMethod("FilterBlueCircleOnLayer")]
        public static void FilterBlueCircleOnLayer0()
        {
            //获取当前文档编辑器
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //创建TypedValue数组定义过滤条件
            TypedValue[] acTypValAr = new TypedValue[3];
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Color, 5), 0);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "CIRCLE"), 1);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.LayerName, "0"), 2);
            //将过滤条件赋值给SelectionFilter对象
            SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);
            //请求在图形区域选择对象
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.GetSelection(acSelFtr);
            //如果提示状态OK，表示对象已选
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " +
                    acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: 0");
            }
        }

        /// <summary>
        /// 选择半径大于等于5的圆
        /// </summary>
        [CommandMethod("FilterRelational")]
        public static void FilterRelational()
        {
            //获取当前文档编辑器
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //创建TypedValue数组，定义过滤条件
            TypedValue[] acTypValAr = new TypedValue[3];
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "CIRCLE"), 0);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Operator, ">="), 1);
            acTypValAr.SetValue(new TypedValue(40, 5), 2);
            //将过滤条件赋给SelectionFilter对象
            SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);
            //请求在图形区域选择对象
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.GetSelection(acSelFtr);
            //如果提示状态OK，表示对象已选
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " +
                    acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: 0");
            }
        }

        /// <summary>
        /// 获取单行或多行文字
        /// </summary>
        [CommandMethod("FilterForText")]
        public static void FilterForText()
        {
            //获取当前文档editor
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //创建TypedValue数组，定义过滤条件
            TypedValue[] acTypValAr = new TypedValue[4];
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Operator, "<OR"), 0);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "TEXT"), 1);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "MTEXT"), 2);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Operator, "or>"), 3);
            //将过滤条件赋给SelectionFilter对象
            SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);
            //请求在图形区域选择对象
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.GetSelection(acSelFtr);
            //如果提示状态OK，说明已选对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " +
                    acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: 0");
            }
        }


        /// <summary>
        /// 选择具有通配符的过滤条件
        /// </summary>
        [CommandMethod("FilterMtextWildcard")]
        public static void FilterMtextWildcard()
        {
            //获取当前文档编辑器
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //创建TypedValue数组，定义过滤条件
            TypedValue[] acTypValAr = new TypedValue[2];
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "MTEXT"), 0);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Text, "*The*"), 1);
            //将过滤条件赋给SelectionFilter对象
            SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);
            //请求在图形区域选择对象
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.GetSelection(acSelFtr);
            //如果提示状态OK，说明已选对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " + acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: 0");
            }
        }

        /// <summary>
        /// 选择含有拓展元素的圆
        /// </summary>
        [CommandMethod("FilterXdata")]
        public static void FilterXdata()
        {
            //获取当前文档编辑器
            Editor acDocEd = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument.Editor;
            //创建TypedValue数组，定义过滤条件
            TypedValue[] acTypValAr = new TypedValue[2];
            acTypValAr.SetValue(new TypedValue((int)DxfCode.Start, "Circle"), 0);
            acTypValAr.SetValue(new TypedValue((int)DxfCode.ExtendedDataRegAppName, "MY_APP"), 1);
            //将过滤条件赋给SelectionFilter对象
            SelectionFilter acSelFtr = new SelectionFilter(acTypValAr);
            //请求在图形区域选择对象
            PromptSelectionResult acSSPrompt;
            acSSPrompt = acDocEd.GetSelection(acSelFtr);
            //如果提示状态OK，说明已选对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: " + acSSet.Count.ToString());
            }
            else
            {
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Number of objects selected: 0");
            }
        }


        /// <summary>
        /// 删除所有未引用的图层
        /// </summary>
        [CommandMethod("PurgeUnreferencedLayers")]
        public static void PurgeUnreferencedLayers()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开图层表
                LayerTable acLyrTbl;
                acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
                    OpenMode.ForRead) as LayerTable;
                //创建一个ObjectIdCollection对象来保存每个图层表记录的objectid
                ObjectIdCollection acObjIdColl = new ObjectIdCollection();
                //遍历图层表并将每个图层添加到ObjectIdCollection
                foreach (ObjectId acObjId in acLyrTbl)
                {
                    acObjIdColl.Add(acObjId);
                }
                //从集合中删除还在使用的图层，返回可以删除的对象集合
                //调用Purge方法：传入参数-ObjectIdCollection对象
                //返回-更新了的ObjectIdCollection对象，包含可以删除的图层
                acCurDb.Purge(acObjIdColl);
                //遍历返回的ObjectIdCollection对象，并删除未引用的图层
                foreach (ObjectId acObjId in acObjIdColl)
                {
                    SymbolTableRecord acSymTblRec;
                    acSymTblRec = acTrans.GetObject(acObjId,
                        OpenMode.ForWrite) as SymbolTableRecord;
                    try
                    {
                        //删除未引用的图层
                        acSymTblRec.Erase(true);
                    }
                    catch (Autodesk.AutoCAD.Runtime.Exception Ex)
                    {
                        //不能删除图层
                        Autodesk.AutoCAD.ApplicationServices.Application.
                            ShowAlertDialog("Error:\n" + Ex.Message);
                    }
                }
                //提交修改，关闭事务
                acTrans.Commit();
            }
        }

        /// <summary>
        /// 重命名图层
        /// </summary>
        [CommandMethod("RenameLayer")]
        public static void RenameLayer()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //返回当前数据库的图层表
                LayerTable acLyrTbl;
                acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,
                    OpenMode.ForWrite) as LayerTable;
                //克隆图层0（复制其及其属性）
                LayerTableRecord acLyrTblRec;
                acLyrTblRec = acTrans.GetObject(acLyrTbl["0"],
                    OpenMode.ForRead).Clone() as LayerTableRecord;
                //修改克隆得到的图层名称
                acLyrTblRec.Name = "MyLayer";
                //使用图层MyLayer可用
                acLyrTbl.Add(acLyrTblRec);
                acTrans.AddNewlyCreatedDBObject(acLyrTblRec, true);
                //提交修改，关闭事务
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 创建一个多段线并删除它
        /// </summary>
        [CommandMethod("EraseObject")]
        public static void EraseObject()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开Block表记录Model空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建轻量多段线
                Polyline acPoly = new Polyline();
                acPoly.AddVertexAt(0, new Point2d(2, 4), 0, 0, 0);
                acPoly.AddVertexAt(1, new Point2d(4, 2), 0, 0, 0);
                acPoly.AddVertexAt(2, new Point2d(6, 4), 0, 0, 0);
                //添加新对象到块表记录和事务
                acBlkTblRec.AppendEntity(acPoly);
                acTrans.AddNewlyCreatedDBObject(acPoly, true);
                //更新显示并显示一条告警信息
                acDoc.Editor.Regen();
                Autodesk.AutoCAD.ApplicationServices.Application.
                    ShowAlertDialog("Erase the newly added polyline.");
                //从图形中删除多段线
                acPoly.Erase(true);
                //提交修改
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 复制单个对象
        /// </summary>
        [CommandMethod("SingleCopy")]
        public static void SingleCopy()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开块表记录模型空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建圆，圆心（2，3） 半径4.25
                Circle acCirc = new Circle();
                acCirc.Center = new Point3d(2, 3, 0);
                acCirc.Radius = 4.25;
                //将新对象添加到块表记录和事务
                acBlkTblRec.AppendEntity(acCirc);
                acTrans.AddNewlyCreatedDBObject(acCirc, true);
                //创建圆的拷贝，修改拷贝的半径
                Circle acCircClone = acCirc.Clone() as Circle;
                acCircClone.Radius = 1;
                //将拷贝的圆添加到块表记录和事务
                acBlkTblRec.AppendEntity(acCircClone);
                acTrans.AddNewlyCreatedDBObject(acCircClone, true);
                //保存新对象到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 复制多个对象
        /// </summary>
        [CommandMethod("MultipleCopy")]
        public static void MultipleCopy()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开块表记录模型空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建圆  圆心（0，0，0） 半径5
                Circle acCirc1 = new Circle();
                acCirc1.Center = new Point3d(0, 0, 0);
                acCirc1.Radius = 5;
                //添加对象到块表记录和事务
                acBlkTblRec.AppendEntity(acCirc1);
                acTrans.AddNewlyCreatedDBObject(acCirc1, true);
                //创建圆  圆心0，0，0  半径7
                Circle acCirc2 = new Circle();
                acCirc2.Center = new Point3d(0, 0, 0);
                acCirc2.Radius = 7;
                //添加对象到块表记录和事务
                acBlkTblRec.AppendEntity(acCirc2);
                acTrans.AddNewlyCreatedDBObject(acCirc2, true);
                //将所有要复制的对象添加到集合
                DBObjectCollection acDBObjectColl = new DBObjectCollection();
                acDBObjectColl.Add(acCirc1);
                acDBObjectColl.Add(acCirc2);
                foreach (Entity acEnt in acDBObjectColl)
                {
                    Entity acEntClone;
                    acEntClone = acEnt.Clone() as Entity;
                    acEntClone.ColorIndex = 1;
                    //创建一个变换矩阵，每个副本实体向右移动15个单位
                    acEntClone.TransformBy(Matrix3d.Displacement(new Vector3d(15, 0, 0)));
                    //将克隆对象添加到块表记录和事务
                    acBlkTblRec.AppendEntity(acEntClone);
                    acTrans.AddNewlyCreatedDBObject(acEntClone, true);
                }
                //保存新对象到数据库
                acTrans.Commit();
            }
        }


        /// <summary>
        /// 从一个数据库复制对象到另一个数据库
        /// </summary>
        [CommandMethod("CopyObjectsBetweenDatabases",CommandFlags.Session)]
        public static void CopyObjectsBetweenDatabases()
        {
            ObjectIdCollection acObjIdColl = new ObjectIdCollection();
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //锁定当前文档
            using (DocumentLock acLckDocCur = acDoc.LockDocument())
            {
                //启动事务
                using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
                {
                    //以读模式打开块表
                    BlockTable acBlkTbl;
                    acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                        OpenMode.ForRead) as BlockTable;
                    //以写模式打开块表记录模型空间
                    BlockTableRecord acBlkTblRec;
                    acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                        OpenMode.ForWrite) as BlockTableRecord;
                    //创建圆，圆心（0，0，0），半径5
                    Circle acCirc1 = new Circle();
                    acCirc1.Center = new Point3d(0, 0, 0);
                    acCirc1.Radius = 5;
                    //添加到块表记录和事务
                    acBlkTblRec.AppendEntity(acCirc1);
                    acTrans.AddNewlyCreatedDBObject(acCirc1, true);
                    //创建圆，圆心（0，0，0），半径7
                    Circle acCirc2 = new Circle();
                    acCirc2.Center = new Point3d(0, 0, 0);
                    acCirc2.Radius = 7;
                    //添加到块表记录和事务
                    acBlkTblRec.AppendEntity(acCirc2);
                    acTrans.AddNewlyCreatedDBObject(acCirc2, true);
                    //添加到要复制对象集合内
                    acObjIdColl = new ObjectIdCollection();
                    acObjIdColl.Add(acCirc1.ObjectId);
                    acObjIdColl.Add(acCirc2.ObjectId);
                    //保存到数据库
                    acTrans.Commit();
                }
            }
            //获取图形模板路径和文件
            string sLocalRoot = Autodesk.AutoCAD.ApplicationServices.Application.
                GetSystemVariable("LOCALROOTPREFIX") as string;
            string sTemplatePath = sLocalRoot + "Template\\acad.dwt";
            //新建一个图形，我们将两个圆复制到这个新图形里
            DocumentCollection acDocMgr = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager;
            Document acNewDoc = acDocMgr.Add(sTemplatePath);
            Database acDbNewDoc = acNewDoc.Database;
            //锁定新文档
            using (DocumentLock acLckDoc = acNewDoc.LockDocument())
            {
                //启动新文档的事务
                using (Transaction acTrans = acDbNewDoc.TransactionManager.StartTransaction())
                {
                    //以读模式打开Block表
                    BlockTable acBlkTblNewDoc;
                    acBlkTblNewDoc = acTrans.GetObject(acDbNewDoc.BlockTableId,
                        OpenMode.ForRead) as BlockTable;
                    //以写模式打开块表记录模型空间
                    BlockTableRecord acBlkTblRecNewDoc;
                    acBlkTblRecNewDoc = acTrans.GetObject(acBlkTblNewDoc[BlockTableRecord.ModelSpace],
                        OpenMode.ForRead) as BlockTableRecord;
                    //克隆对象到新数据库
                    IdMapping acIdMap = new IdMapping();
                    acCurDb.WblockCloneObjects(acObjIdColl, acBlkTblRecNewDoc.ObjectId, acIdMap,
                        DuplicateRecordCloning.Ignore, false);
                    //保存复制的对象到数据库
                    acTrans.Commit();
                }
            }
            //将新文档设置为当前文档
            acDocMgr.MdiActiveDocument = acNewDoc;
        }

        /// <summary>
        /// 偏移多段线
        /// </summary>
        [CommandMethod("OffsetObject")]
        public static void OffsetObject()
        {
            //获取当前文档和数据库
            Document acDoc = Autodesk.AutoCAD.ApplicationServices.Application.
                DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;
            //启动事务
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读模式打开Block表
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                    OpenMode.ForRead) as BlockTable;
                //以写模式打开块表记录模型空间
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                    OpenMode.ForWrite) as BlockTableRecord;
                //创建多段线
                Polyline acPoly = new Polyline();
                acPoly.AddVertexAt(0, new Point2d(1, 1), 0, 0, 0);
                acPoly.AddVertexAt(1, new Point2d(1, 2), 0, 0, 0);
                acPoly.AddVertexAt(2, new Point2d(2, 2), 0, 0, 0);
                acPoly.AddVertexAt(3, new Point2d(3, 2), 0, 0, 0);
                acPoly.AddVertexAt(4, new Point2d(4, 4), 0, 0, 0);
                acPoly.AddVertexAt(5, new Point2d(4, 1), 0, 0, 0);
                //添加新对象到块表记录和事务
                acBlkTblRec.AppendEntity(acPoly);
                acTrans.AddNewlyCreatedDBObject(acPoly, true);
                //偏移距离0.25
                DBObjectCollection acDbObjColl = acPoly.GetOffsetCurves(0.25);
                //遍历得到的新对象
                foreach (Entity acEnt in acDbObjColl)
                {
                    //添加每个对象
                    acBlkTblRec.AppendEntity(acEnt);
                    acTrans.AddNewlyCreatedDBObject(acEnt, true);
                }
                //保存新对象到数据库
                acTrans.Commit();
            }
        }
        #endregion
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