使用C#中的AutoCAD .NET API对CAD二次开发，获取为块添加属性_autocad 开发 .net api

public void AddBlockAttr()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = doc.Editor;

    using (Transaction tr = db.TransactionManager.StartTransaction())
    {
        // 获取选择对象
        PromptSelectionResult psr = ed.GetSelection();
        if (psr.Status != PromptStatus.OK)
        {
            ed.WriteMessage("没有选择任何块。");
            return;
        }

        SelectionSet ss = psr.Value;
        foreach (SelectedObject selObj in ss)
        {
            // 获取块参照对象
            BlockReference blockRef = tr.GetObject(selObj.ObjectId, OpenMode.ForWrite) as BlockReference;
            if (blockRef == null)
            {
                ed.WriteMessage("选择的对象不是块参照。");
                continue;
            }
            // 添加自定义属性
            AttributeDefinition attDef = new AttributeDefinition();
            attDef.Position = blockRef.Position;
            attDef.Tag = "MyCustomProperty";  //YourAttributeName"
            attDef.Prompt = "请输入自定义属性值："; //"Enter a value for the attribute:";
            attDef.TextString = "12345";  //Default value
            attDef.Height = 2.5;
            attDef.Justify = AttachmentPoint.MiddleCenter;
            attDef.AlignmentPoint = blockRef.Position;
            attDef.Layer = "0";
            attDef.ColorIndex = 256;

            // 将属性添加到块参照对象的属性集合中
            AttributeReference attRef = new AttributeReference();
            attRef.SetAttributeFromBlock(attDef, blockRef.BlockTransform);
            blockRef.AttributeCollection.AppendAttribute(attRef);
            tr.AddNewlyCreatedDBObject(attRef, true);

        }

        tr.Commit();
    }
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