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：

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);
        }
    }
}