CAD二次开发中各类多段线的dxf组码

            Document doc = Application.DocumentManager.MdiActiveDocument;
            Editor ed = doc.Editor;

            ed.WriteMessage(RXObject.GetClass(typeof(Polyline)).DxfName + "\n");
            ed.WriteMessage(RXObject.GetClass(typeof(Polyline2d)).DxfName + "\n");
            ed.WriteMessage(RXObject.GetClass(typeof(Polyline3d)).DxfName + "\n");