<UserControl x:Class="SilverlightAppDemo12.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400" Loaded="UserControl_Loaded">

<Grid Background="#46461F">
<Grid.RowDefinitions>
<RowDefinition Height="40"></RowDefinition>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="40"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<Border Grid.Row="0" Grid.Column="0" CornerRadius="15"
Width="240" Height="36"
Margin="20 0 0 0" HorizontalAlignment="Left">
<TextBlock Text="书籍列表" Foreground="White"
HorizontalAlignment="Left" VerticalAlignment="Center"
Margin="20 0 0 0"></TextBlock>
</Border>
<ListBox x:Name="Books" Grid.Row="1" Margin="40 10 10 10"
SelectionChanged="Books_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Name}" Height="32"></TextBlock>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Border Grid.Row="2" Grid.Column="0" CornerRadius="15"
Width="240" Height="36" Background="Orange"
Margin="20 0 0 0" HorizontalAlignment="Left">
<TextBlock x:Name="lblPrice" Text="价格：" Foreground="White"
HorizontalAlignment="Left" VerticalAlignment="Center"
Margin="20 0 0 0"></TextBlock>
</Border>
</Grid>
</UserControl>

public class BookHandler : IHttpHandler
{
public static readonly string[] PriceList = new string[] {
"66.00",
"78.30",
"56.50",
"28.80",
"77.00"
};
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
　　　　//主要语句。是此接口提供的返回值
　　　　　　context.Response.Write(PriceList[Int32.Parse(context.Request.QueryString["No"])]);
}

public bool IsReusable
{
get
{
return false;
}
}

void UserControl_Loaded(object sender, RoutedEventArgs e)
{
List<Book> books = new List<Book>() {
new Book("Professional ASP.NET 3.5"),
new Book("ASP.NET AJAX In Action"),
new Book("Silverlight In Action"),
new Book("ASP.NET 3.5 Unleashed"),
new Book("Introducing Microsoft ASP.NET AJAX")
};

Books.ItemsSource = books;

}

void Books_SelectionChanged(object sender, SelectionChangedEventArgs e)
{//端口49955是设定了的提供此服务的端口
Uri endpoint = new Uri(String.Format("http://localhost:49955/BookHandler.ashx?No={0}", Books.SelectedIndex));

WebClient client = new WebClient();
client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);

client.DownloadStringAsync(endpoint);
}

void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
if (e.Error == null)
{
lblPrice.Text = "价格：" + e.Result;
}
else
{
lblPrice.Text = e.Error.Message;
}
}