c# - Windows Phone 7 上的 HttpWebRequest

Question

我有这个代码:

        private HttpWebRequest request;
        private HttpWebResponse wResponse;
        private CookieContainer cookieContainer = new CookieContainer();
        #region PRIVATE METHODS
        private void RunRequest(string url)
        {
            request = HttpWebRequest.Create(new Uri(url)) as HttpWebRequest;
            request.UserAgent = "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.205 Safari/534.16";
            request.ContentType = "application/x-www-form-urlencoded";
            request.CookieContainer = cookieContainer;
            request.Method = "GET";

            StartWebRequest(request);

            //Do smthng
            while (wResponse == null) { }
        }

        private void StartWebRequest(HttpWebRequest request)
        {
            request.BeginGetResponse(FinishWebRequest, request);
        }

        private void FinishWebRequest(IAsyncResult result)
        {
            wResponse = (result.AsyncState as HttpWebRequest).EndGetResponse(result) as HttpWebResponse;
        }
        #endregion

并且 wRequest 变量未填充任何响应。在 AsyncState 中我有这个:

可能是什么问题？

附:相同的代码在桌面应用程序上运行良好。

谢谢， 帕维尔.

Answer 1

您的代码中有两个问题。

1. 您没有正确使用异步回调方法:

   替换

   request.BeginGetResponse(FinishWebRequest, request);

   与

   request.BeginGetResponse(new AsyncCallback(FinishWebRequest), request);

2. 为 GET 请求指定 Content-Type 无效，必须 对于 POST 请求。修改RunRequest()方法:

   private void RunRequest(string url, string method)
   {
       request = HttpWebRequest.Create(new Uri(url)) as HttpWebRequest;
       request.UserAgent = "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.205 Safari/534.16";
       request.Method = method; // method can be GET, POST etc.
       if (method == "POST")
           request.ContentType = "application/x-www-form-urlencoded";
       request.CookieContainer = cookieContainer;
       ...
   }