WP7 应用程序从不退出 BeginGetResponse 并进入回调函数

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问题描述

我有以下代码:

private void GetRequestStreamCallback(IAsyncResult asynchronousResult)
        {
            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

            // End the operation
            Stream postStream = request.EndGetRequestStream(asynchronousResult);

            //Console.WriteLine("Please enter the input data to be posted:");
            //string postData = Console.ReadLine();
            string postData = "my data";

            // Convert the string into a byte array.
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);

            // Write to the request stream.
            postStream.Write(byteArray, 0, postData.Length);
            postStream.Close();

                // Start the asynchronous operation to get the response
                IAsyncResult result =
                      (IAsyncResult)request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);

        }

        private void GetResponseCallback(IAsyncResult asynchronousResult)
        {
            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;

            // End the operation
            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
            Stream streamResponse = response.GetResponseStream();
            StreamReader streamRead = new StreamReader(streamResponse);
            string responseString = streamRead.ReadToEnd();
            Console.WriteLine(responseString);
            // Close the stream object
            streamResponse.Close();
            streamRead.Close();

            // Release the HttpWebResponse
            response.Close();
            allDone.Set();

            Dispatcher.BeginInvoke((Action)(() => Debug.WriteLine("George")));
        }

但是，当我的代码遇到 BeginGetResponse 时，它​​永远不会退出(而且我没有在 GetResponseCallback 函数中遇到断点).我尝试添加了 BeginInvoke 调用，但我仍然没有进入这个方法.此代码适用于 Windows 控制台应用程序 - 它在 Windows Phone 7 上没有 teorg

However when my code hits BeginGetResponse it never exits (and I do not hit a breakpoint in the GetResponseCallback function). I tried adding the BeginInvoke call, but I still never enter this method. This code works in a windows console app - it's on Windows Phone 7 that it doesn'teorg

谁能看出我做错了什么?

Can anyone see what I am doing wrong?

谢谢.

推荐答案

如果你已经在UI线程上创建了HttpWebRequest，那么一定不要阻塞UI线程，否则会死锁.

If you have created the HttpWebRequest on the UI thread, then make sure you don't block the UI thread, otherwise you can deadlock.

您链接的桌面 .NET 示例并未针对当前的电话网络堆栈进行优化.您应该更改代码，以便在后台线程上创建 HttpWebRequest.

The sample from the desktop .NET you have linked isn't optimized for the current phone networking stack. You should change the code so that you create the HttpWebRequest on a background thread.

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