/// <summary>

         /// 打开样式选择器

         /// </summary>

         /// <param name="sender"></param>

         /// <param name="e"></param>

         private void toolStripButton_OpenSymbolSelector_Click(object sender, EventArgs e)

         {

             SymbolSelectorDialog symbolSelectDialog = new SymbolSelectorDialog();

             //1.获取要操作的图层

             IMap map = mapControlMain.FocusMap;

             IFeatureLayer featureLayer = map.GetLayer() as IFeatureLayer;

             //2.判断图层的类型

             GeometryType geoType = featureLayer.FeatureClass.GetGeomType();

             ISymbol currentSymbol = null;

             switch (geoType)

             {

                 case GeometryType.GeometryPoint:

                     currentSymbol = new SimpleMarkerSymbol();

                     break;

                 case GeometryType.GeometryPolygon:

                     currentSymbol = new SimpleFillSymbol();

                     break;

                 case GeometryType.GeometryPolyline:

                     currentSymbol = new SimpleLineSymbol();

                     break;

                 case GeometryType.GeometryUnknown:

                     break;

                 default:

                     break;

             }

             if (currentSymbol != null)

             {

                 //3.对话框显示当前图层的类型符号

                 symbolSelectDialog.Symbol = currentSymbol;

                 if (symbolSelectDialog.ShowDialog() != ) return;//判断ok还是取消

                 //4.将选中的符号进行渲染

                 ISymbol selectSymbol = symbolSelectDialog.Symbol;

                 //IFeatureRender featureRender = featureLayer.Render;

                 IFeatureUniqueValueRender render = new FeatureUniqueValueRender();

                 render.DefaultSymbol = selectSymbol;

                 featureLayer.Render = render as IFeatureRender;

                 mapControlMain.PartialRefresh(ViewDrawPhaseType.ViewAll);

             }

         }