arcgis engine实现查询要素同时闪烁代码

ArcGIS Engine 可以用 C# 或 VB.NET 编写代码，实现查询要素并同时闪烁的效果。以下是一个示例代码：

private void FlashFeature(IFeature feature, IMapControl3 mapControl)
{
    // 获取要素的几何图形
    IGeometry geometry = feature.Shape;

    // 创建一个闪烁符号
    ISymbol symbol = new SimpleMarkerSymbolClass();
    ((ISimpleMarkerSymbol)symbol).Color = getRGB(255, 0, 0);
    ((ISimpleMarkerSymbol)symbol).Style = esriSimpleMarkerStyle.esriSMSCircle;
    ((ISimpleMarkerSymbol)symbol).Outline = true;
    ((ISimpleMarkerSymbol)symbol).OutlineSize = 1;

    // 创建一个闪烁效果
    IFlashGeometry flashGeometry = new FlashGeometryClass();
    flashGeometry.Geometry = geometry;
    flashGeometry.Symbol = symbol;

    // 将闪烁效果加入到地图控件中
    IActiveView activeView = mapControl.ActiveView;
    activeView.ScreenDisplay.StartDrawing(0, (short)esriScreenCache.esriNoScreenCache);
    flashGeometry.Start(activeView.ScreenDisplay);

    // 等待一段时间
    System.Threading.Thread.Sleep(500);

    // 停止闪烁效果
    flashGeometry.Stop();
    activeView.ScreenDisplay.FinishDrawing();
}

private IRgbColor getRGB(int r, int g, int b)
{
    IRgbColor color = new RgbColorClass();
    color.Red = r;
    color.Green = g;
    color.Blue = b;
    return color;
}

private void QueryAndFlashFeature(IMapControl3 mapControl, IQueryFilter queryFilter)
{
    // 获取地图图层
    IEnumLayer enumLayer = mapControl.Map.get_Layers(null, true);
    ILayer layer = null;
    while ((layer = enumLayer.Next()) != null)
    {
        // 判断图层是否为要素图层
        IFeatureLayer featureLayer = layer as IFeatureLayer;
        if (featureLayer == null) continue;

        // 查询要素
        IFeatureCursor featureCursor = featureLayer.Search(queryFilter, false);
        IFeature feature = null;
        while ((feature = featureCursor.NextFeature()) != null)
        {
            // 闪烁要素
            FlashFeature(feature, mapControl);
        }
    }
}

private void btnQuery_Click(object sender, EventArgs e)
{
    // 创建查询过滤器
    IQueryFilter queryFilter = new QueryFilterClass();
    queryFilter.WhereClause = "CITY_NAME = '北京'";

    // 查询并闪烁要素
    QueryAndFlashFeature(axMapControl1, queryFilter);
}

在这个代码中，`FlashFeature` 方法用于将一个要素闪烁。`QueryAndFlashFeature` 方法用于查询符合条件的要素，并将它们闪烁。在 `btnQuery_Click` 事件中，我们创建了一个查询过滤器，查询城市名称为“北京”的要素，并将它们闪烁。