silverlight与WebRequest通信

客户端代码

using System.IO;
namespace webrequest
{
    public partial class MainPage : UserControl
    {

        public MainPage()
        {
            InitializeComponent();
        }

        //定义异步委托方法
        delegate void DispatcherInvoke(string str);
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            //Url地址(必须是绝对地址)
            string url = "http://localhost:53822/timeHandler.ashx?day=10";
            //创建WebRequest对象
            WebRequest request = HttpWebRequest.Create(new Uri(url, UriKind.Absolute));
            //请求类型
            request.Method = "GET";
            //开始获取响应并进行异步回调
            request.BeginGetResponse(new AsyncCallback(responseReady), request);
            //其请求是异步回调方式的，从BeginGetResponse开始，并通过AsyncCallback指定回调方法；
        }

        public void responseReady(IAsyncResult ar)
        {
            WebRequest resquest = ar.AsyncState as WebRequest;
            WebResponse response = resquest.EndGetResponse(ar);
            //直接读取将发生跨线程错误：跨域线程访问无效
            //using (Stream stream = response.GetResponseStream())
            //{
            //    StreamReader reader = new StreamReader(stream);
            //    MessageBox.Show(reader.ReadToEnd());
            //}
            //因为其回调不是UI线程，所以不能直接对UI进行操作，这里使用Dispatcher.BeginInvoke()异步执行委托方法           
            Dispatcher.BeginInvoke(() =>
            {
                using (Stream stream = response.GetResponseStream())
                {
                    StreamReader reader = new StreamReader(stream);
                    MessageBox.Show(reader.ReadToEnd());
                }
            });
        }
    }
}

服务端参照：silverlight与WebClient通信