ArcEngine中同时高亮和闪烁多个要素的用户控件代码

ArcEngine中同时闪烁多个要素的用户控件代码关键点：

对IArray、IFeature.ShapeCopy、HookHelperClass以及IHookActions.DoActionOnMultiple的正确使用。 代码如下：

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Linq; using System.Text; using System.Windows.Forms; using ESRI.ArcGIS.Geodatabase; using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.Display; using ESRI.ArcGIS.Geometry; using ESRI.ArcGIS.Controls; using ESRI.ArcGIS.esriSystem;   namespace AgsTester {     /// <summary>     /// 本用户控件上需要放一个地图控件     /// </summary>     public partial class FlashMutiGeometry : UserControl     {         public FlashMutiGeometry()         {             InitializeComponent();         }           /// <summary>         /// 加载地图         /// </summary>         /// <param name="pathMap"></param>         public void LoadMap(string pathMap)         {             axMapControl1.LoadMxFile(pathMap);         }           /// <summary>         /// 以村为单位过滤显示         /// </summary>         /// <param name="where">查询条件</param>         public void FilterLayer(string where)         {             IFeatureLayer flyr = (IFeatureLayer)axMapControl1.get_Layer(0);             IFeatureClass fcls = flyr.FeatureClass;               IQueryFilter queryFilter = new QueryFilterClass();             queryFilter.WhereClause = where;               // 缩放到选择结果集，并高亮显示             ZoomToSelectedFeature(flyr, queryFilter);               //闪烁选中得图斑             IFeatureCursor featureCursor = fcls.Search(queryFilter, true);             FlashPolygons(featureCursor);         }           /// <summary>         /// 缩放到选择结果集，并高亮显示         /// </summary>         /// <param name="pFeatureLyr"></param>         /// <param name="pQueryFilter"></param>         private void ZoomToSelectedFeature(IFeatureLayer pFeatureLyr, IQueryFilter pQueryFilter)         {             #region 高亮显示查询到的要素集合               //符号边线颜色             IRgbColor pLineColor = new RgbColor();             pLineColor.Red = 255;             ILineSymbol ilSymbl = new SimpleLineSymbolClass();             ilSymbl.Color = pLineColor;             ilSymbl.Width = 5;               //定义选中???素的符号为红色             ISimpleFillSymbol ipSimpleFillSymbol = new SimpleFillSymbol();             ipSimpleFillSymbol.Outline = ilSymbl;             RgbColor pFillColor = new RgbColor();             pFillColor.Green = 60;             ipSimpleFillSymbol.Color = pFillColor;             ipSimpleFillSymbol.Style = esriSimpleFillStyle.esriSFSForwardDiagonal;               //选取要素集             IFeatureSelection pFtSelection = pFeatureLyr as IFeatureSelection;             pFtSelection.SetSelectionSymbol = true;             pFtSelection.SelectionSymbol = (ISymbol)ipSimpleFillSymbol;             pFtSelection.SelectFeatures(pQueryFilter, esriSelectionResultEnum.esriSelectionResultNew, false);               #endregion               ISelectionSet pSelectionSet = pFtSelection.SelectionSet;             //居中显示选中要素             IEnumGeometry pEnumGeom = new EnumFeatureGeometry();             IEnumGeometryBind pEnumGeomBind = pEnumGeom as IEnumGeometryBind;             pEnumGeomBind.BindGeometrySource(null, pSelectionSet);             IGeometryFactory pGeomFactory = new GeometryEnvironmentClass();             IGeometry pGeom = pGeomFactory.CreateGeometryFromEnumerator(pEnumGeom);               axMapControl1.ActiveView.Extent = pGeom.Envelope;             axMapControl1.ActiveView.Refresh();         }           /// <summary>         /// 闪烁选中得图斑         /// </summary>         /// <param name="featureCursor"></param>         private void FlashPolygons(IFeatureCursor featureCursor)         {             IArray geoArray = new ArrayClass();             IFeature feature = null;             while ((feature = featureCursor.NextFeature()) != null)             {                 //feature是循环外指针，所以必须用ShapeCopy                 geoArray.Add(feature.ShapeCopy);             }               //通过IHookActions闪烁要素集合             HookHelperClass m_pHookHelper = new HookHelperClass();             m_pHookHelper.Hook = axMapControl1.Object;             IHookActions hookActions = (IHookActions)m_pHookHelper;               hookActions.DoActionOnMultiple(geoArray, esriHookActions.esriHookActionsPan);             //hookActions.DoActionOnMultiple(geoArray, esriHookActions.esriHookActionsGraphic);             //hookActions.DoActionOnMultiple(geoArray, esriHookActions.esriHookActionsZoom);             Application.DoEvents();             m_pHookHelper.ActiveView.ScreenDisplay.UpdateWindow();               hookActions.DoActionOnMultiple(geoArray, esriHookActions.esriHookActionsFlash);         }     } }