SilverLight中数据与通信之WebClient

概述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     {         publ

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

前台代码：

<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>

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;

        }

}

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