CAD二次开发——选择集（1）_cad二次开发选择集

Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            Editor ed = doc.Editor;
            选择所有元素
            //PromptSelectionResult psr = ed.SelectAll();
            //单个选择
            PromptSelectionResult psr = ed.GetSelection();
            if (psr.Status==PromptStatus.OK)
            {
                SelectionSet sSet = psr.Value;
                ObjectId[] Ids = sSet.GetObjectIds();
                using (Transaction trans = db.TransactionManager.StartTransaction())
                {
                    for (int i = 0; i < Ids.Length; i++)
                    {
                        Entity ent = Ids[i].GetObject(OpenMode.ForWrite) as Entity;
                        ent.ColorIndex = 1;
                    }
                    trans.Commit();
                }
            }