Web Mapping for Silverlight:拉框查询，并将结果输出到表格中

本文链接：https://blog.youkuaiyun.com/FlexMapServer/article/details/5974352

本文介绍了一个使用Silverlight进行地图拉框查询的应用实例。通过XAML和C#代码实现地图上的几何图形绘制及查询结果的数据展示。文章详细展示了如何配置地图服务层、设置样式模板以及实现查询任务。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Web Mapping for Silverlight:拉框查询，并将结果输出到表格中：

1.xaml文件代码如下：

2.后台C#代码如下：

using System; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Media; using ESRI.ArcGIS.Client; using ESRI.ArcGIS.Client.Symbols; using ESRI.ArcGIS.Client.Tasks; using System.Collections.Generic; namespace SampleSL { /// <summary> /// This class handles the identify operation performed /// </summary> public class MapIdentify { #region identify declaration private Map objMap = null; private MainPage objMapPage = null; private DataGrid objQueryResultsDataGrid = null; private MarkerSymbol objQueryMarkerSymbol = null; private FillSymbol objQueryFillSymbol = null; private GeometryType objSelectGeometry = GeometryType.Point; private FillSymbol objQueryPolygonSymbol = null; private LineSymbol objQueryPolylineSymbol = null; private DataPager objResultsDataPager = null; private TextBlock txtRecordsDetails = null; private string strAssetName = string.Empty; #endregion /// <summary> /// Initiate the identify operation with MainPage,querygeometry and asset name /// </summary> /// <param name="pageMapPage"></param> /// <param name="queryGeometry"></param> /// <param name="assetName"></param> public MapIdentify(MainPage pageMapPage, ESRI.ArcGIS.Client.Geometry.Geometry queryGeometry) { #region Local variables int intQueryLayerID; string strQueryServiceUrl = string.Empty; Query objIdentifyQuery = null; string strQueryFileds = string.Empty; string strQueryLayerName = string.Empty; ESRI.ArcGIS.Client.Graphic objFillGraphic = null; GraphicsLayer lyrSelectionGraphicslayer = null; GraphicsLayer lyrDrawGraphicslayer = null; QueryTask objQueryTask = null; GraphicsLayer lyrZoomGraphicslayer = null; #endregion try { #region Set Local variable objMapPage = pageMapPage; objQueryMarkerSymbol = objMapPage.DefaultClickSymbol; this.txtRecordsDetails = pageMapPage.txtRecordsDetails; this.objQueryPolygonSymbol = new FillSymbol(); this.objQueryPolygonSymbol.Fill = new SolidColorBrush(Colors.Yellow); this.objQueryPolylineSymbol = new LineSymbol(); this.objQueryPolylineSymbol.Color = new SolidColorBrush(Colors.Yellow); this.objQueryPolylineSymbol.Width = 3; // this.objQueryMarkerSymbol = pageMapPage.esriDefaultMarker_33; this.objQueryFillSymbol = pageMapPage.DefaultFillSymbol; this.objMap = pageMapPage.slMap; this.objResultsDataPager = pageMapPage.slPager; this.objQueryResultsDataGrid = pageMapPage.grdQueryDetails; lyrSelectionGraphicslayer = objMap.Layers["MySelectionGraphicsLayer"] as GraphicsLayer; lyrDrawGraphicslayer = objMap.Layers["MyDrawGraphicsLayer"] as GraphicsLayer; lyrZoomGraphicslayer = objMap.Layers["MyZoomGraphicsLayer"] as GraphicsLayer; #endregion lyrSelectionGraphicslayer.ClearGraphics(); lyrDrawGraphicslayer.ClearGraphics(); lyrDrawGraphicslayer.ClearGraphics(); objResultsDataPager.PageIndexChanged += ResultsDataPager_PageIndexChanged; lyrSelectionGraphicslayer = objMap.Layers["MySelectionGraphicsLayer"] as GraphicsLayer; lyrSelectionGraphicslayer.ClearGraphics(); lyrDrawGraphicslayer = objMap.Layers["MyDrawGraphicsLayer"] as GraphicsLayer; lyrDrawGraphicslayer.ClearGraphics(); objFillGraphic = new ESRI.ArcGIS.Client.Graphic() { Geometry = queryGeometry, Symbol = objQueryFillSymbol }; //http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0 lyrDrawGraphicslayer.Graphics.Add(objFillGraphic);// strQueryServiceUrl = "http://pc1010/ArcGIS/rest/services/world/MapServer/0"; //intQueryLayerID = MapUtility.getQueryLayerId(objMap, assetName); objQueryTask = new QueryTask(strQueryServiceUrl);//strQueryServiceUrl + "/" + intQueryLayerID); objQueryTask.ExecuteCompleted += QueryTask_ExecuteCompleted; objQueryTask.Failed += QueryTask_Failed; objIdentifyQuery = new ESRI.ArcGIS.Client.Tasks.Query(); //strQueryLayerName = MapUtility.getQueryLayerName(objMap, assetName); objQueryResultsDataGrid.HeadersVisibility = DataGridHeadersVisibility.All; //strQueryFileds = strQueryFileds.Remove(strQueryFileds.Length - 1, 1); objIdentifyQuery.OutFields.AddRange(new string[] { "CITY_NAME, ADMIN_NAME, STATUS" }); objIdentifyQuery.OutFields.Add("*"); objIdentifyQuery.OutSpatialReferenceWKID = objMap.SpatialReference.WKID; objIdentifyQuery.Geometry = queryGeometry; objIdentifyQuery.ReturnGeometry = true; objQueryTask.ExecuteAsync(objIdentifyQuery); } catch (Exception Ex) { MessageBox.Show(Ex.Message, "Unable To Identify", MessageBoxButton.OK); } finally { } } /// <summary> /// Handler for ResultsDataPager page selection change /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void ResultsDataPager_PageIndexChanged(object sender, EventArgs e) { DataPager objPagerItem = sender as DataPager; if (objPagerItem.ItemCount > 0) { txtRecordsDetails.Text = "Displaying " + ((System.Windows.Data.PagedCollectionView)objPagerItem.Source).Count + " Records Out Of " + objPagerItem.ItemCount; } } /// <summary> /// Querytask completion event /// </summary> /// <param name="sender"></param> /// <param name="args"></param> private void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args) { #region Local variables QueryTask identifyQueryTask = null; objQueryResultsDataGrid.ItemsSource = null; FeatureSet objFeatureSet = null; GraphicsLayer objSelectionGraphicsLayer = null; PagedCollectionView dataPageView = null; GraphicAttributeColumn objTextBoxColumn = null; string strQueryLayerName = string.Empty; DataPager objPagerItem = null; #endregion identifyQueryTask = sender as QueryTask; objFeatureSet = args.FeatureSet; if (objFeatureSet == null || objFeatureSet.Features.Count < 1) { MessageBox.Show("No records found"); txtRecordsDetails.Text = string.Empty; return; } List<string> strFields = new List<string>(); List<string> strFieldAlias = new List<string>(); strFields.Add("CITY_NAME"); strFields.Add("ADMIN_NAME"); strFields.Add("STATUS"); strFieldAlias.Add("CITY NAME"); strFieldAlias.Add("ADMIN_NAME"); strFieldAlias.Add("STATUS"); for (int objLayerCount = 0; objLayerCount < strFields.Count; objLayerCount++) { objTextBoxColumn = new GraphicAttributeColumn(); objTextBoxColumn.Header = strFieldAlias[objLayerCount].ToString(); objTextBoxColumn.AttributeName = strFields[objLayerCount].ToString(); objTextBoxColumn.IsReadOnly = true; objQueryResultsDataGrid.Columns.Add(objTextBoxColumn); } objSelectGeometry = args.FeatureSet.GeometryType; objSelectionGraphicsLayer = objMap.Layers["MySelectionGraphicsLayer"] as GraphicsLayer; objMap.Extent = objSelectionGraphicsLayer.FullExtent; dataPageView = new PagedCollectionView(identifyQueryTask.LastResult); objQueryResultsDataGrid.ItemsSource = dataPageView; objResultsDataPager.Visibility = Visibility.Visible; objResultsDataPager.DataContext = objQueryResultsDataGrid.ItemsSource; objMapPage.slPager.PageIndex = 0; objPagerItem = objMapPage.slPager; //objQueryResultsDataGrid.SizeChanged+=new SizeChangedEventHandler(objQueryResultsDataGrid_SizeChanged); if (objPagerItem.ItemCount > 0) { txtRecordsDetails.Text = "Displaying " + ((System.Windows.Data.PagedCollectionView)objPagerItem.Source).Count + " Records Out Of " + objPagerItem.ItemCount; } } /// <summary> /// Querytask Failed event /// </summary> /// <param name="sender"></param> /// <param name="args"></param> private void QueryTask_Failed(object sender, TaskFailedEventArgs args) { if (objQueryResultsDataGrid.Columns.Count > 1) { for (int intColcount = 1; intColcount < objQueryResultsDataGrid.Columns.Count; intColcount++) { objQueryResultsDataGrid.Columns.RemoveAt(intColcount); } } MessageBox.Show("Unable To Identify: " + args.Error); } /// <summary> /// Event to handle the query results selection in results displayed in QueryResultsDataGrid /// /// </summary> /// <param name="sender"></param> /// <param name="e"></param> } }

3.运行结果如下：

拉框查询