急问，图层为何不能添加和删除图元？

[sunnyfire]

Error executing statement : insert into \"Project\"(Obj, ProjectID, MI_Style) values(@0, @1, @2): The requested operation cannot be called while there is an open cursor or while there is an open modify interface.: Unable to perform requested modification.

请问这是什么问题引起的？

开发环境.NET2003 ASP.NET Mapxtreme 6.1

[jhqjhq]

能否贴些代码出来.

以下的可以:
onnection=new MapInfo.Data.MIConnection();



Connection.Open ();
MapInfo.Geometry.Point pt=new MapInfo.Geometry.Point(mapControl1.Map.GetDisplayCoordSys(),-122.8788,40.3815);
MapInfo.Styles.FontPointStyle sty=new MapInfo.Styles.FontPointStyle(66,new MapInfo.Styles.Font("MapInfo Transportation",48),0,System.Drawing.Color.Aqua,18);
//将小车增加到图层
MICommand comm=Connection.CreateCommand();
comm.CommandText ="Insert into targetTable(ID,name,obj,mi_style) values('1','car1',@obj,@style)";
comm.Parameters.Add ("@obj",pt);
comm.Parameters.Add ("@style",sty);
comm.ExecuteNonQuery();



Connection.Close();

[he_hawk]

up

[kingtoping]

图层有没有被占有,进行编辑之前,将与此图层有关的变量全部清空.

[yxz0321]

这是因为图层有未保存的编辑操作，在编辑之前commit一次，或者保存一下地图。