C# 开发cad 添加菜单栏下拉子菜单

[CommandMethod("caidan")]
   public void ShowJingDianMenu()
    {
      try
         {
                IAcadApplication app = Autodesk.AutoCAD.ApplicationServices.Application.AcadApplication as AcadApplication;

                if (app == null) return;

                Document doc = Application.DocumentManager.MdiActiveDocument;

                Database db = doc.Database;

                Editor ed = doc.Editor;

                if (app.MenuGroups == null || app.MenuGroups.Item(0) == null) return;

                AcadMenuGroups acadMenuGroups = app.MenuGroups;

                int index = 0;

                foreach (AcadMenuGroup item in acadMenuGroups)
                {
                    string name = item.Name;

                    //name.ToLower() == "3dtool_menugroup"

                    if ( name.ToLower() == "amacad")

                        break;

                    index++;

                }

                for (int i = 0; i < app.MenuGroups.Item(index).Menus.Count; i++)

                {

                    if (app.MenuGroups.Item(index).Menus.Item(i).Name == "3DTool")

                    {

                        //app.MenuGroups.Item(index).Menus.Item(i).RemoveFromMenuBar();

                        ed.WriteMessage("3DTool已存在菜单组！");

                        return;

                    }

                }

                //添加根菜单

                AcadPopupMenu pmParnet = app.MenuGroups.Item(index).Menus.Add("3DTool");

                int countmenubar = app.MenuBar.Count;

                //多级 AcadPopupMenu

                //AcadPopupMenu pm = pmParnet.AddSubMenu(pmParnet.Count + 1, "绘制模型");

                //AcadPopupMenuItem pmi0 = pm.AddMenuItem(pm.Count + 1, "文件  ", "OPEN1\n");  //第一个参数是在菜单项中的位置（第几项），第二个参数是显示的名称，第三个参数是点击之后执行的命令

                //AcadPopupMenuItem pmi1 = pm.AddMenuItem(pm.Count + 1, "模版  ", "OPEN2\n");

                //单级 AcadPopupMenuItem  
                pmParnet.AddMenuItem(pmParnet.Count + 1, "绘制模型", "_CON ");

                pmParnet.AddSeparator(pmParnet.Count + 1);

                pmParnet.AddMenuItem(pmParnet.Count + 1, "导出设备清单", "_ETOE ");

                pmParnet.AddSeparator(pmParnet.Count + 1);

                pmParnet.AddMenuItem(pmParnet.Count + 1, "修改模型", "_MDC ");

                pmParnet.AddSeparator(pmParnet.Count + 1);

                pmParnet.AddMenuItem(pmParnet.Count + 1, "修改编号", "_GAT ");

                pmParnet.AddSeparator(pmParnet.Count + 1);

                pmParnet.AddMenuItem(pmParnet.Count + 1, "输出GA图", "_GAT ");

                pmParnet.AddSeparator(pmParnet.Count + 1);

                pmParnet.AddMenuItem(pmParnet.Count + 1, "导出BOM清单", "_EBOM ");

                pmParnet.AddSeparator(pmParnet.Count + 1);

                pmParnet.AddMenuItem(pmParnet.Count + 1, "镜像和改属性", "cusmirror ");

                //将创建的菜单加入到CAD的菜单中
                pmParnet.InsertInMenuBar(countmenubar + 1);
                ed.WriteMessage("3DTool工具条生成完成！");
            }
            catch (System.Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

com 接口添加菜单栏