（1）xaml文件：
//添加Symbol命名空间
xmlns:esriSymbols="clr-namespace:ESRI.ArcGIS.Client.Symbols;assembly=ESRI.ArcGIS.Client
//创建Symbol
<Grid.Resources>
<esriSymbols:SimpleFillSymbol x:Name="ResultsFillSymbol" Fill="#64FF0000" BorderBrush="Red" BorderThickness="2" />
</Grid.Resources>
//创建GraphicsLayer，显示查询结果
<esri:GraphicsLayer ID="MyGraphicsLayer">
<esri:GraphicsLayer.MapTip>
<Grid Background="LightYellow">
<StackPanel Margin="5">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding [NAME]}" FontWeight="Bold" />
<TextBlock Text=" County, " FontWeight="Bold" />
<TextBlock Text="{Binding [STATE_NAME]}" FontWeight="Bold" />
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock Text="Population (2007): " />
<TextBlock Text="{Binding [POP2007]}" />
</StackPanel>
</StackPanel>
<Border BorderBrush="Black" BorderThickness="1" />
</Grid>
</esri:GraphicsLayer.MapTip>
</esri:GraphicsLayer>
//Find对话框
<Canvas HorizontalAlignment="" VerticalAlignment="" Margin="0,15,7,0" Width="230" >
<Rectangle Fill="#CC5C90B2" Stroke="Gray" RadiusX="10" RadiusY="10" Width="210" Height="55" />
<TextBlock Text="Find的国家名：" Foreground="White" FontSize="10" Margin="10,5,0,0" />
<TextBox x:Name="FindTextBox" Width="150" Margin="15,22,0,0" Text="Wash" />
<Button x:Name="FindButton" Content="Find" Margin="168,23,0,0" Click="FindButton_Click" />
</Canvas>
（2）cs文件
//添加命名空间
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Tasks;
// 点击find按钮，执行Find
private void FindButton_Click(object sender, RoutedEventArgs e)
{
//初始化Find task
FindTask findTask = new FindTask("http://./ArcGIS/rest/services/./MapServer/");
findTask.ExecuteCompleted += FindTask_ExecuteCompleted;
findTask.Failed += FindTask_Failed;
//初始化Find参数：将countries图层的Name字段作为Find Field
FindParameters findParameters = new FindParameters();
findParameters.LayerIds.AddRange(new int[] { 3 });
findParameters.SearchFields.AddRange(new string[] { "NAME" });
//返回find结果的feature geometry
findParameters.ReturnGeometry = true;
//textbox的text作为查询关键字
findParameters.SearchText = FindTextBox.Text;
//执行查询
findTask.ExecuteAsync(findParameters);
}
//find结束后，将结果绘制在地图上
private void FindTask_ExecuteCompleted(object sender, FindEventArgs args)
{
//获取graphicsLayer，清除先前的查询结果
GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
graphicsLayer.ClearGraphics();
// Check for new results
if (args.FindResults.Count > 0)
{
//将结果添加进地图
foreach (FindResult result in args.FindResults)
{
result.Feature.Symbol = ResultsFillSymbol;
graphicsLayer.Graphics.Add(result.Feature);
}
}
else
{
MessageBox.Show("No features found");
}
}
//find失败时，显示失败原因
private void FindTask_Failed(object sender, TaskFailedEventArgs args)
{
MessageBox.Show("Find failed: " + args.Error);
}
（1）xaml文件：
//添加命名空间
xmlns:esriTasks="clr-namespace:ESRI.ArcGIS.Client.Tasks;assembly=ESRI.ArcGIS.Client" xmlns:esriSymbols="clr-namespace:ESRI.ArcGIS.Client.Symbols;assembly=ESRI.ArcGIS.Client xmlns:slData="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
//定义task resources
<Grid.Resources>
<esriSymbols:PictureMarkerSymbol x:Name="IdentifyLocationSymbol" OffsetX="35" OffsetY="35" Source="/Assets/images/i_about.png" />
<esriSymbols:SimpleFillSymbol x:Name="SelectedFeatureSymbol" Fill="#64FF0000" BorderBrush="Red" BorderThickness="2" />
</Grid.Resources>
//创建GraphicsLayer，容纳Identify的地图结果显示
<esri:GraphicsLayer ID="ResultsGraphicsLayer" />
<esri:GraphicsLayer ID="IdentifyIconGraphicsLayer" />
//Identify的属性结果显示界面
<StackPanel Margin="10" HorizontalAlignment="Left">
<Grid>
<Rectangle Fill="#CC5C90B2" Stroke="Gray" RadiusX="10" RadiusY="10" />
<TextBlock Text="点击地图identify feature" Foreground="White" FontSize="10" Margin="10,5,10,5" />
<StackPanel x:Name="IdentifyResultsStackPanel" Margin="15,30,15,10" Visibility="Collapsed">
<TextBlock Text="Select a result from the list to display it" Foreground="White" FontSize="10" Margin="0,0,0,5" />
<ComboBox x:Name="IdentifyComboBox" SelectionChanged="IdentifyComboBox_SelectionChanged" />
<ScrollViewer MaxHeight="340" Margin="0,10,0,0">
<slData:DataGrid x:Name="IdentifyDetailsDataGrid" AutoGenerateColumns="False" HeadersVisibility="None" >
<slData:DataGrid.Columns>
<slData:DataGridTextColumn Binding="{Binding Path=Key}" FontWeight="Bold"/>
<slData:DataGridTextColumn Binding="{Binding Path=Value}"/>
</slData:DataGrid.Columns>
</slData:DataGrid>
</ScrollViewer>
</StackPanel>
</Grid>
</StackPanel>
（2）cs文件
//添加命名空间
using ESRI.ArcGIS.Client.Tasks;
using ESRI.ArcGIS.Client.Symbols;
// IdentifyResult
private List<IdentifyResult> _lastIdentifyResult;
public MainPage() { InitializeComponent(); }
// 点击地图，执行Identify
private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs args)
{
//在identify的地方（鼠标点击附近）显示一个icon
GraphicsLayer graphicsLayer = MyMap.Layers["IdentifyIconGraphicsLayer"] as GraphicsLayer;
graphicsLayer.ClearGraphics();
ESRI.ArcGIS.Client.Graphic graphic = new ESRI.ArcGIS.Client.Graphic()
{
Geometry = args.MapPoint,
Symbol = IdentifyLocationSymbol
};
graphicsLayer.Graphics.Add(graphic);
// 初始化Identify task
IdentifyTask identifyTask = new IdentifyTask("http://./ArcGIS/rest/services/./MapServer");
identifyTask.ExecuteCompleted += IdentifyTask_ExecuteCompleted;
identifyTask.Failed += IdentifyTask_Failed;
//初始化Identify parameters，指定searching的layers
IdentifyParameters identifyParameters = new IdentifyParameters();
identifyParameters.LayerOption = LayerOption.all;
// 设置identify parameters：通过地图的现有属性
identifyParameters.MapExtent = MyMap.Extent;
identifyParameters.Width = (int)MyMap.ActualWidth;
identifyParameters.Height = (int)MyMap.ActualHeight;
//通过点击执行Identify features
identifyParameters.Geometry = args.MapPoint;
identifyTask.ExecuteAsync(identifyParameters);
}
//identify完成后，查询结果的Attribute显示窗口
private void IdentifyTask_ExecuteCompleted(object sender, IdentifyEventArgs args)
{
//清除旧的结果
IdentifyComboBox.Items.Clear();
// Check for new results
if (args.IdentifyResults.Count > 0)
{
IdentifyResultsStackPanel.Visibility = Visibility.Visible;
//将结果添加到ComboBox
foreach (IdentifyResult result in args.IdentifyResults)
{
string title = string.Format("{0} ({1})", result.Value.ToString(), result.LayerName);
IdentifyComboBox.Items.Add(title);
}
// Workaround for ComboBox bug
IdentifyComboBox.UpdateLayout();
// Store the list of identify results
_lastIdentifyResult = args.IdentifyResults;
// Initialize ComboBox and fire SelectionChanged
IdentifyComboBox.SelectedIndex = 0;
}
else
{
// Hide ComboBox and attributes DataGrid and notify user
IdentifyResultsStackPanel.Visibility = Visibility.Collapsed;
MessageBox.Show("No features found");
}
}
//多个结果时，点击下拉框更改其它结果
void IdentifyComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
//地图上清除先前的结果
GraphicsLayer graphicsLayer = MyMap.Layers["ResultsGraphicsLayer"] as GraphicsLayer;
graphicsLayer.ClearGraphics();
// Check that ComboBox has a selected item. Needed because SelectionChanged fires
// when ComboBox.Clear is called.
if (IdentifyComboBox.SelectedIndex > -1)
{
// Update DataGrid with selected feature's attributes
Graphic selectedFeature = _lastIdentifyResult[IdentifyComboBox.SelectedIndex].Feature;
IdentifyDetailsDataGrid.ItemsSource = selectedFeature.Attributes;
// Apply symbol and add selected feature to map
selectedFeature.Symbol = SelectedFeatureSymbol;
graphicsLayer.Graphics.Add(selectedFeature);
}
}
//identify失败时，显示失败原因
private void IdentifyTask_Failed(object sender, TaskFailedEventArgs args)
{
MessageBox.Show("Identify failed: " + args.Error);
}