WP7上带有HttpWebRequest的ManualResetEvent [英] ManualResetEvent with HttpWebRequest on WP7

问题描述

首先，可以将其标记为以下线程的重复项:等待HttpWebRequest.BeginGetResponse在Windows Phone 7中完成，但是，该线程中的响应并没有帮助我解决问题.

To start off with, this might be tagged as a duplicate of the following thread: Wait for HttpWebRequest.BeginGetResponse to finish in Windows Phone 7, however, the responses in that thread did not help me get over my problem.

首先，我在UI线程上收集用户数据以处理应用程序注册，在这里我还有一个ManualResetEvent实例:

To begin with, I am collecting user data on the UI Thread in order to process application registration, where I also have an instance of ManualResetEvent:

private static ManualResetEvent registrationEvent = new ManualResetEvent(false);

我有另一个线程来处理注册过程(并包括HttpWebRequest.BeginGetResponse()及其对应的回调方法.)

I have another thread which handles the registration process (and includes the HttpWebRequest.BeginGetResponse() and its corresponding callback method.)

Thread t = new Thread(() => RegistrationHandler.sendRegistrationData(url));
t.Start();

此调用之后，我立即调用

Right after this call, I block the current (UI) thread with a call to

registrationEvent.WaitOne();

//Process the response, update some UI elements and navigate to a different page.
httpSessionCompleted(response);

一旦处理注册过程的线程开始，我将实例化HttpWebRequest并在其上调用BeginGetResponse()方法.

Once the thread handling the registration process starts, I am instantiating HttpWebRequest and invoking the BeginGetResponse() method on it.

try
{
    HttpWebRequest request = HttpWebRequest.CreateHttp(url);
    request.Method = "POST";
    request.ContentType = mimeType;

    request.BeginGetResponse(new AsyncCallback(GetRequestCallback), request);
}
catch (Exception ex)
{
    Console.WriteLine("Exception caught in sendData(): {0}", ex.Message);
}

现在的问题是，永远不会调用回调方法(下面的代码)，并且应用程序只会冻结.似乎也没有引发任何异常.

Now the issue is that the callback method (code below) is never invoked, and the application just freezes. There also doesn't seem to be any exception(s) thrown either.

try
{
    HttpWebRequest request = (HttpWebRequest)asyncResult.AsyncState;

    if (request != null)
    {
        using (HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyncResult))
                {
                    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                    {
                        String result = reader.ReadToEnd();
                        Globals.HostResponse = result;
                        //Signalling the calling thread to continue execution
                        RegistrationPage.RegistrationEvent.Set();
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception caught in GetRequestCallback(): {0}", ex.Message);
        }

理想情况下，我希望我的应用程序在回调方法完成执行后从httpSessionCompleted()继续.有人可以帮我一些指导/建议吗?

I ideally want my application to continue from httpSessionCompleted() after the callback method finishes execution. Can someone please help me with some guidance/suggestions?

很抱歉，很冗长.谢谢！

Sorry for being verbose. Thanks!

推荐答案

您不应阻止 UI线程，而应使用回调模式.查看以下内容: Windows Phone 7-等待Webclient完成.希望这会有所帮助

You should not block UI thread, use callback pattern instead. Look at this: Windows Phone 7 - wait for Webclient to complete . Hope this helps

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