/// <summary>

         /// 修改元素的位置和形状 以面元素为例

         /// </summary>

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

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

         private void toolStripButton_ModifyElement_Click(object sender, EventArgs e)

         {

             //1.设置空间信息

             IPointCollection polygon = new Polygon();

             polygon.AddPoint(, , );

             polygon.AddPoint(, , );

             polygon.AddPoint(, , );

             polygon.AddPoint(, , );

             polygon.AddPoint(, , );

             //2.设置面元素信息并在地图控件中显示

             IPolygonElement polyElement = new PolygonElement();

             polyElement.Geometry = polygon as IGeometry;

             polyElement.Symbol = SystemSymbolSetting.Instance.DefaultFillSymbol;

             string id = polyElement.GetID();            mapControlMain.ActiveView.GraphicsContainer.AddElement(polyElement);           mapControlMain.PartialRefresh(ViewDrawPhaseType.ViewAll);

             //3.设置修改空间信息

             IPolygonElement polyElement2 = new PolygonElement();

             IPointCollection polygon1 = new Polygon();

             polygon1.AddPoint(, , );

             polygon1.AddPoint(, , );

             polygon1.AddPoint(, , );

             polygon1.AddPoint(, , );

             polygon1.AddPoint(, , );

             polyElement2.Geometry = polygon1 as IGeometry;

             //4.设置修改的符号信息

             ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbol();

             simpleFillSymbol.Style = SimpleFillStyle.SFSDense2Pattern;

             IFillSymbol fillSybol = simpleFillSymbol as IFillSymbol;

             fillSybol.Color = Color.Green;

             polyElement2.Symbol = fillSybol;

             //5修改更新元素            mapControlMain.ActiveView.GraphicsContainer.UpdateElement(id, polyElement2);//更新元素

         }