AutoCAD二次开发（.Net）之创建图层Layer

//https://blog.csdn.net/qq_21489689?t=1
[CommandMethod("CREATELY")]
        public void CreateLayer()
        {
            Document acDoc = Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;//获取当前数据库
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                //以读的方式打开图层表
                LayerTable acLyrTbl = acTrans.GetObject(acCurDb.LayerTableId,OpenMode.ForRead) as LayerTable;
                string sLayerName = "Layer Name";//设定一个图层名称
                if (acLyrTbl.Has(sLayerName) == false)
                {
                    using (LayerTableRecord acLyrTblRec = new LayerTableRecord())
                    {
                        acLyrTblRec.Color = Color.FromColorIndex(ColorMethod.ByAci, 3);// 指定图层颜色
                        acLyrTblRec.Name = sLayerName;// 指定图层名称
                        acLyrTbl.UpgradeOpen();//修改图层打开方式为写
                        acLyrTbl.Add(acLyrTblRec);//将新图层追加到图层表
                        acTrans.AddNewlyCreatedDBObject(acLyrTblRec, true);
                    }
                }
                acTrans.Commit();
            }
        }