silverlight异步请求 httpwebrequest

Question

request.BeginGetResponse(new AsyncCallback(ResponseReady), request);
           allDone.WaitOne();在allDone.WaitOne();执行后就一直等待然后我想实现同步怎么做呀

Answer 1

public class Http
    {
        private  ManualResetEvent allDone = new ManualResetEvent(false);
        private string sendData；               public delegate void CallBack(string url);
        public event CallBack CallBackEvent;        //post方式
        public void PostRequest(string url, string dataStr)
        {
            this.sendData = dataStr;
            Uri endpoint = new Uri(url);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endpoint);
            request.Method = "POST";
            request.ContentType = "text/xml";
            request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);
            allDone.WaitOne();        }        void RequestReady(IAsyncResult asyncResult)
        {
            HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
            Stream requestStream = request.EndGetRequestStream(asyncResult);
            StreamWriter sw = new StreamWriter(requestStream);
            byte[] byteArray = Encoding.Unicode.GetBytes(sendData);
            sw.Write(sendData);
            requestStream.Write(byteArray, 0, sendData.Length);
            sw.Close();
            request.BeginGetResponse(new AsyncCallback(ResponseReady), request);        }
        
        void ResponseReady(IAsyncResult asyncResult)
        {
            HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyncResult);
            try 
            {
                using (Stream responseStream = response.GetResponseStream())
                {
                    StreamReader reader = new StreamReader(responseStream);
                    string retureValue = reader.ReadToEnd();
                    if (CallBackEvent != null)
                    {
                        CallBackEvent(retureValue);
                    }
                    reader.Close();
                }
            }
            catch(Exception)
            {            }
            finally
            {
                 allDone.Set();            }
    }
这个是个类，我在外面使用的类的PostRequest时候到上面那句就一直等待
怎么回事呀，如何实现异步中的同步呀

Answer 2

silverlight 不支持同步请求。
只能异步