Windows Phone 7 上 HttpWebRequest 中的 NotSupportedException [英] NotSupportedException in HttpWebRequest on Windows Phone 7

问题描述

我有一个用 silverlight 构建的 Windows Phone 7 应用程序.此应用程序已部署.我在日志文件中注意到，我的用户的操作偶尔会抛出NotSupportedException".我一直无法生产这个.但是，由于我的日志，我知道它发生在此处显示的 Execute 方法中:

I have a Windows Phone 7 application built with silverlight. This application has been deployed. I've noticed in the log files that occasionally, my user's actions throw a "NotSupportedException". I have not been able to produce this. However, because of my logs, I know that it is happening in the Execute method shown here:

public void Execute()
{
  try
  {
    // 1. Build the query
   string serviceUrl = GetServiceUrl;

    // 2. Asynchronously execute the query using HttpWebRequest
    WebRequest request = HttpWebRequest.Create(serviceUrl);
    request.BeginGetResponse(new AsyncCallback(ServiceRequest_Completed), request);
  }   catch (Exception ex)
  {
    LogException(ex, "1");
  }
}


private void ServiceRequest_Completed(IAsyncResult result)
{
  try
  {
    // 1. Get the response from the service call
    WebRequest request = (WebRequest)(result.AsyncState);
    WebResponse response = request.EndGetResponse(result);

    // 2. Do stuff with response
  } 
  catch (Exception ex)
  {
    LogException(ex, "2");
  }
}

我知道它发生在 Execute 方法中，因为日志文件中写入的是1"而不是2".我的问题是，什么会导致这种情况?我查看了 MSDN 文档 看起来我正在做我应该做的事情.就像我说的，我无法在本地复制它.但我确实知道由于日志文件，它经常由不同的用户发生.

I know it is happening in the Execute method because the "1" is written in the log file instead of the "2" My question is, what would cause this? I looked at the MSDN documentation and it looks like I'm doing what I should be doing. Like I said, I can't reproduce it locally. But I do know that it is happening regularly by different users because of the log files.

推荐答案

之前有一个标题非常相似的问题 - https://stackoverflow.com/questions/4053197/httpwebrequest-leads-me-to-system-notsupportedexception

There is a previous question with a very similar title - https://stackoverflow.com/questions/4053197/httpwebrequest-leads-me-to-system-notsupportedexception

这个问题的答案似乎是使用 ServiceRequest_Completed 而不是 new AsyncCallback(ServiceRequest_Completed)

The answer to that problem seems to have been using ServiceRequest_Completed instead of new AsyncCallback(ServiceRequest_Completed)

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