我以前的应用程序无法在 WP8 上运行时遇到问题，该应用程序在 WP7 上运行良好。
这是我用于 http 请求的代码：
public void SendMessage()
{
request = WebRequest.Create(uri) as HttpWebRequest;
request.Method = "POST";
request.AllowReadStreamBuffering = true;
request.ContentType = "application/octet-stream";
try
{
// get device info
String deviceInfo = String.Format("platform,{0};os,{1};width,{2};height,{3};dpi,{4};",
Config.PLATFORM_NAME,
Environment.OSVersion.Version.ToString(),
System.Windows.Application.Current.Host.Content.ActualWidth.ToString(),
System.Windows.Application.Current.Host.Content.ActualHeight.ToString(),
96);
request.Headers["X_MX_DEVICE_INFO"] = deviceInfo;
}
catch (Exception) {}
request.BeginGetRequestStream(new AsyncCallback(ProcessRequestStream), null);
}
private void ProcessRequestStream(IAsyncResult asyncResult)
{
if (!message.IsCancelled())
{
try
{
using (Stream stream = request.EndGetRequestStream(asyncResult))
{
message.GetRequest(stream);
}
request.BeginGetResponse(new AsyncCallback(ProcessResponseStream), null);
}
catch (Exception e)
{
syncContext.Post(OnEnd, e);
}
}
else
{
syncContext.Post(OnEnd, null);
}
}
private void ProcessResponseStream(IAsyncResult asyncResult)
{
if (!message.IsCancelled())
{
try
{
response = (HttpWebResponse)request.EndGetResponse(asyncResult);
if (HttpStatusCode.OK != response.StatusCode)
{
throw new Exception("http status error: " + response.ToString());
}
syncContext.Post(SetResponse, response);
}
catch (Exception e)
{
syncContext.Post(OnEnd, e);
}
}
else
{
syncContext.Post(OnEnd, null);
}
}
private void SetResponse(object state)
{
Exception ex = null;
try
{
using (Stream stream = ((HttpWebResponse)state).GetResponseStream())
{
message.SetRespone(stream);
}
}
catch (Exception e)
{
ex = e;
}
syncContext.Post(OnEnd, ex);
}
private void OnEnd(object state)
{
message.OnEnd((Exception)state);
}
}
看起来好像 BeginGetResponse 的回调没有被触发。我试过 Fiddler 来看看什么响应回来了，看起来好像什么都没有回来，但只是针对 WP8。
这有什么可能的原因吗？