.net中取得CAD的当前图层名称

 ///         /// 取得当前图层名称        ///         /// 数据库对象        ///         public  static string  GetCurrentLayer(this Database db)        {            //Database db = HostApplicationServices.WorkingDatabase;            using (Transaction trans = db.TransactionManager.StartTransaction())            {                //获取当前图形中所有颜色为红色的图层层名                var CurrentLayer = (from layer in db.GetAllLayers()                                 where layer.Id==db.Clayer                                 select layer.Name).ToList();                return CurrentLayer[0];                trans.Commit();            }        }

上面这个办法比较麻烦，可以按下面的办法做：

        ///         /// 取得当前图层名称        ///         /// 数据库对象        ///         public  static string  GetCurrentLayer(this Database db)        {            using (Transaction trans = db.TransactionManager.StartTransaction())            {                LayerTableRecord ltr = (LayerTableRecord)db.Clayer.GetObject(OpenMode.ForRead);                return ltr.Name;                trans.Commit();            }        }