首先,这可能被标记为以下线程的副本: Wait for HttpWebRequest.BeginGetResponse to finish in Windows Phone 7但是,该主题中的回复并没有帮助我克服我的问题。
首先,我在UI线程上收集用户数据以处理应用程序注册,其中我还有一个ManualResetEvent实例:
private static ManualResetEvent registrationEvent = new ManualResetEvent(false);
我有另一个处理注册过程的线程(包括HttpWebRequest.BeginGetResponse()及其相应的回调方法。)
Thread t = new Thread(() => RegistrationHandler.sendRegistrationData(url));
t.Start();
在此调用之后,我通过调用
来阻止当前(UI)线程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,我就会实例化HttpWebRequest并在其上调用BeginGetResponse()方法。
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);
}
现在问题是从不调用回调方法(下面的代码),应用程序只是冻结。似乎也没有抛出任何异常。
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。有人可以帮我提一些指导/建议吗?
很抱歉这很详细。谢谢!
答案 0 :(得分:0)
您不应阻止UI thread
,而是使用回调模式。看看这个:Windows Phone 7 - wait for Webclient to complete。希望这有帮助