Question

如题。我想在程序中打开SQL型数据源，并且在mapcontrol控件上显示出来，下面为部分代码                                Datasources data = new Datasources();
                DatasourceConnectionInfo info = new             DatasourceConnectionInfo();
                info.EngineType = EngineType.SQLPlus;

                .........

                Datasource m_data=data.Open(info);

        
                //这句代码出问题

                mapControl1.Map.Datasource= m_data;