AutoCAD.NET根據輸入名字添加指定圖層

        [CommandMethod("AddLayer")]
        public void AddLayer_Method()
        {
            Database db = HostApplicationServices.WorkingDatabase;
            Editor ed = MgdAcApplication.DocumentManager.MdiActiveDocument.Editor;
            
            try
            {
                using (Transaction tr = db.TransactionManager.StartTransaction())
                {
                    PromptStringOptions pStr = new PromptStringOptions("請輸入新建圖層名：\n");
                    PromptResult pRes = ed.GetString(pStr);
                    if (pRes.Status == PromptStatus.OK)
                    {
                        string layerName = pRes.StringResult;
                        LayerTable lt = (LayerTable)db.LayerTableId.GetObject(OpenMode.ForRead);
                        if (!lt.Has(layerName))
                        {
                            LayerTableRecord ltr = new LayerTableRecord();
                            ltr.Name = layerName;
                            lt.UpgradeOpen();
                            lt.Add(ltr);

                            db.TransactionManager.AddNewlyCreatedDBObject(ltr, true);
                            lt.DowngradeOpen();
                        }

                        lt = (LayerTable)db.LayerTableId.GetObject(OpenMode.ForRead);
                        if (lt.Has(layerName))
                            ed.WriteMessage("\n{0}圖層創建成功！", layerName);
                        else
                            ed.WriteMessage("\n{0}圖層創建失敗！", layerName);
                    }
                    tr.Commit();
                }
            }
            catch (System.Exception ex)
            {
                Debug.WriteLine(ex.ToString());
                ed.WriteMessage(ex.ToString());
            }
        }

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