c# - WP7 应用程序永远不会退出 BeginGetResponse 并进入回调函数

Question

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，当我的代码命中 BeginGetResponse 时，它​​永远不会退出(而且我没有命中 GetResponseCallback 函数中的断点)。我尝试添加 BeginInvoke 调用，但我仍然没有进入此方法。此代码可在 Windows 控制台应用程序中运行 - 它在 Windows Phone 7 上不适用

谁能看出我做错了什么？

谢谢。

Answer 1

如果您在 UI 线程上创建了 HttpWebRequest，请确保您没有阻塞 UI 线程，否则可能会死锁。

您链接的桌面 .NET 示例未针对当前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。