SilverLight中数据与通信之WebRequest

亦凉 2022-08-07 12:50 155阅读 0赞

SilverLight中 数据与通信之WebRequest

1.新建一个处理类BookHandler.ashx

publicclass BookHandler : IHttpHandler

public void ProcessRequest(HttpContext context)

//context.Response.ContentType = "text/plain";

//context.Response.Write(PriceList\[Int32.Parse(context.Request.QueryString\["No"\])\]);

context.Response.ContentType = "text/plain";

context.Response.Write(PriceList\[Int32.Parse(context.Request.Form\["No"\])\]);

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:

publicpartial class MainPage : UserControl

private string bookNo = "0";

public MainPage()

InitializeComponent();

Loaded += new RoutedEventHandler(MainPage\_Loaded);

void MainPage\_Loaded(object sender, RoutedEventArgs e)

List<Book> books = new List<Book>() \{

new Book("精通 ASP.NET 3.5"),

new Book("ASP.NET AJAX 实践"),

new Book("Silverlight 实践"),

new Book("ASP.NET 3.5 Unleashed"),

new Book("Introducing Microsoft ASP.NET AJAX")

\};

Books.ItemsSource = books;

void Books\_SelectionChanged(object sender, SelectionChangedEventArgs e)

bookNo = Books.SelectedIndex.ToString();

//这里涉及两个问题：

//1.跨线程更新UI //可参考 http://www.cnblogs.com/RChen/archive/2008/07/25/1250948.html

//2.跨域调用

Uri endpoint = new Uri("http://localhost:4699/BookHandler.ashx");

WebRequest request = WebRequest.Create(endpoint);

request.Method = "POST";

request.ContentType = "application/x-www-form-urlencoded";

request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);

void RequestReady(IAsyncResult asyncResult)

WebRequest request = asyncResult.AsyncState as WebRequest;

Stream requestStream = request.EndGetRequestStream(asyncResult);

using (StreamWriter writer = new StreamWriter(requestStream))

writer.Write(String.Format("No=\{0\}", bookNo));

writer.Flush();

request.BeginGetResponse(new AsyncCallback(ResponseReady), request);

void ResponseReady(IAsyncResult asyncResult)

WebRequest request = asyncResult.AsyncState as WebRequest;

WebResponse response = request.EndGetResponse(asyncResult);

using (Stream responseStream = response.GetResponseStream())

StreamReader reader = new StreamReader(responseStream);

//更新界面

lblPrice.Dispatcher.BeginInvoke(new UpdatePriceDelegate(UpdatePrice), reader.ReadToEnd());

private delegate void UpdatePriceDelegate(string price);

private void UpdatePrice(string price)

lblPrice.Text = "价格:" \+ price;

public class Book

public Book(string name)

this.Name = name;

public string Name

get;

set;

SilverLight中数据与通信之WebRequest

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