在MIX08上，Chris Pendlenton演示了一款Silverlight地图控件，给大家留下了深刻的印象。时隔一年，在MIX09上，微软终于发布了这款名叫“Virtual Earth Silverlight Map Control”的Silverlight控件技术预览版。
Virtual Earth Silverlight Map Control将Virtual Earth融入了Silverlight，使开发者不必再去使用大量麻烦的Javascript API来开发Virtual Earth应用了。除此之外，它还具有以下优点：
- 对数据和地图进行动画开发；
- 可缩放的界面，包括将来的移动版；
- 深入整合视频、音频和图像，不仅仅是弹出层；
- 支持自定义主题的地图控件；
- 跨浏览器支持，不再需要考虑 CSS Hack 和跨浏览器的 JavaScript 问题。
这个控件的应用非常简单。下面我们就打开Visual Studio 2008,随便试试吧！
效果图：（围观链接：http://azuredrive.blob.core.windows.net/netdrive1/file_e31368a2-988b-4429-b75b-2eb865185c76.html 注：该控件是同时支持Silverlight 2.0和3.0的，但本例中我使用了3.0）
第一步：打开VS2008，新建Silverlight项目。(2.0与3.0的Silverlight Tools均可)
第二步：添加对Microsoft.VirtualEarth.MapControl.dll的引用。
Microsoft.VirtualEarth.MapControl.dll位于Virtual Earth Silverlight Map Control (CTP) SDK安装路径内。
第三步：在Silverlight的MainPage.xaml(2.0中是Page.xaml)中插入地图控件。
<UserControl x:Class="SilverlightApplication1.Page"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:m="clr-namespace:Microsoft.VirtualEarth.MapControl;assembly=Microsoft.VirtualEarth.MapControl">
<Grid x:Name="LayoutRoot" Background="White">
<m:Map/>
</Grid>
</UserControl>
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:m="clr-namespace:Microsoft.VirtualEarth.MapControl;assembly=Microsoft.VirtualEarth.MapControl">
<Grid x:Name="LayoutRoot" Background="White">
<m:Map/>
</Grid>
</UserControl>
如果你F5运行它的话，你已经可以看到Virtual Earth地图呈现在你的Silverlight项目里了。我们还要做更多。
第四步：拖入一些简单的控件。
<UserControl x:Class="SLLiveEarthControl.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:VirtualEarth="clr-namespace:Microsoft.VirtualEarth.MapControl;assembly=Microsoft.VirtualEarth.MapControl" Width="700" Height="500"> <Grid x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="40" /> <RowDefinition Height="40" /> </Grid.RowDefinitions> <VirtualEarth:Map x:Name="viewMap" Mode="AerialWithLabels" Grid.Column="0" Grid.Row="0" Grid.RowSpan="3" Padding="5" View="29.544,106.518,0.0000 14.0000 0.0000" MouseDoubleClick="MapWithImages_MouseDoubleClick" /> <StackPanel Orientation="Horizontal" Opacity="0.7" Grid.Column="0" Grid.Row="1" HorizontalAlignment="Center"> <Button x:Name="btnNorthAmerica" Click="ChangeMapView_Click" Tag="39.89341,116.33235,0.0000 14.0000 0.0000" Margin="5" Height="20" > <TextBlock>北京</TextBlock> </Button> <Button x:Name="btnChengdu" Click="ChangeMapView_Click" Tag="30.67,104.074,0.0000 14.0000 0.0000" Margin="5" Height="20" > <TextBlock>成都</TextBlock> </Button> <Button x:Name="btnShanghai" Click="ChangeMapView_Click" Tag="31.10,121.411,0.0000 13.0000 0.0000" Margin="5" Height="20" > <TextBlock>上海</TextBlock> </Button> <Button x:Name="btnVancouver" Click="ChangeMapView_Click" Tag="29.544,106.518,0.0000 14.0000 0.0000" Margin="5" Height="20" > <TextBlock>重庆</TextBlock> </Button> </StackPanel> <StackPanel Orientation="Horizontal" Opacity="0.9" Grid.Column="0" Grid.Row="2" HorizontalAlignment="Center"> <TextBlock Text="双击地图可以添加图钉。 更改经纬度后可点击Fly to换位置. " Padding="5" Foreground="Red" Width="178" TextWrapping="Wrap"/> <TextBlock Text="Latitude: " Padding="12" Foreground="Red" /> <TextBox x:Name="txtLatitude" Text="" Height="20" /> <TextBlock Text="Longitude: " Padding="12" Foreground="Red" /> <TextBox x:Name="txtLongitude" Text="" Height="20" /> <Button x:Name="btnFlyto" Click="btnFlyto_Click" Foreground="Red" Margin="5" Height="20" > <TextBlock>Fly to</TextBlock> </Button> </StackPanel> </Grid></UserControl>第五步：写后台代码。
using System;using System.Windows;using System.Windows.Controls;using System.Globalization;using Microsoft.VirtualEarth.MapControl;using Microsoft.VirtualEarth.MapControl.Design;using System.Windows.Media;using System.Windows.Media.Imaging;namespace SLLiveEarthControl
{
public partial class MainPage : UserControl
{ 
LocationConverter locConverter = new LocationConverter(); // Converts the Button's location Tag to a map view.. MapViewSpecificationConverter viewConverter = new MapViewSpecificationConverter(); private MapLayer imageLayer = new MapLayer(); public MainPage() { InitializeComponent(); viewMap.AddChild(imageLayer); viewMap.ViewChangeOnFrame += new EventHandler<MapEventArgs>(viewMap_ViewChangeOnFrame); viewMap.AnimationLevel = AnimationLevel.Full;
} private void viewMap_ViewChangeOnFrame(object sender, MapEventArgs e) { Map map = sender as Map; if (map != null) { MapViewSpecification mapViewSpec = map.View; // 根据地图当前的状态动态改变txtLatitude和txtLongitude的值 txtLatitude.Text = string.Format(CultureInfo.InvariantCulture, "{0:F5}", mapViewSpec.Center.Latitude); txtLongitude.Text = string.Format(CultureInfo.InvariantCulture, "{0:F5}", mapViewSpec.Center.Longitude); } } private void ChangeMapView_Click(object sender, RoutedEventArgs e) { viewMap.View = (MapViewSpecification)viewConverter.ConvertFrom(((Button)sender).Tag); } private void MapWithImages_MouseDoubleClick(object sender, MapMouseEventArgs e) { e.Handled = true; Location pinLocation = viewMap.ViewportPointToLocation(e.ViewportPoint); Image pin = new Image(); Random r = new Random(); pin.Source = new BitmapImage(new Uri(r.Next() % 2==0 ? "female.png" : "male.png", UriKind.RelativeOrAbsolute)); pin.Stretch = Stretch.None; imageLayer.AddChild(pin, pinLocation, PositionMethod.BottomCenter); } private void btnFlyto_Click(object sender, RoutedEventArgs e) { viewMap.View = new MapViewSpecification(new Location(Double.Parse(txtLatitude.Text), Double.Parse(txtLongitude.Text)), 14); } }
}你可能已经注意到，我们在编程时已经完全脱离了Javascript；Virtual Earth在我们的手中，已经变得和TextBox,DataGrid一样，只是一个控制非常方便的控件了。 : )
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附件：
本例代码下载：SLLiveEarthControl.rar