【转】ArcGIS API for Silverlight/WPF 2.1学习笔记（五）

2、Find示例代码

（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);

}

3、Identify示例代码

（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);

}

4、Adress locator示例代码（暂未学）

5、Geometry示例代码（暂未学）

6、Geoprocessing示例代码（暂未学）

7、Route示例代码（暂未学）