SilverLight中数据与通信之WebClient
1. 新建一个处理类BookHandler.ashx
注意:IhttpHandler要求必须实现接口ProcessRequest(HttpContext context)和bool IsReusable
public class BookHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
context.Response.Write(PriceList[Int32.Parse(context.Request.QueryString["No"])]);
}
public bool IsReusable
{
get
{
return false;
}
}
public static readonly string[] PriceList = new string[] {
"66.00",
"78.30",
"56.50",
"28.80",
"77.00"
};
}
2. 调用
<Grid x:Name="LayoutRoot" 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>
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
Loaded += new RoutedEventHandler(MainPage_Loaded);
}
void MainPage_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)
{
Uri endpoint = new Uri(String.Format("http://localhost:4699/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;
}
}
}
public class Book
{
public Book(string name)
{
this.Name = name;
}
public string Name
{
get;
set;
}
}
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