SilverLight中数据与通信之WebClient

雨点打透心脏的1/2处 2022-08-07 12:50 134阅读 0赞

**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**

前台代码：

<Grid.RowDefinitions>

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

</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>

</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>

后台代码：

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;

SilverLight中数据与通信之WebClient

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