我的HttpWebRequest有什么問題

Question

我不知道我的代碼中缺少什么。

如果我撥打404網址，我的代碼會獲得例外。

HttpWebRequest req = WebRequest.Create(args.Url) as HttpWebRequest;
req.AllowAutoRedirect = true;
req.Timeout = args.TimeOut;
req.UserAgent = args.UserAgent;   
HttpWebResponse answer = req.GetResponse() as HttpWebResponse;
objResult.Status =answer.StatusCode;
Stream stream = answer.GetResponseStream();

我在req.GetResponse（）上得到一個例外

我得到了錯誤

遠程服務器返回錯誤：（404）Not Found。

我不應該收到HttpStatusCode.NotFound嗎？

解決方案 ：

try
      {
        HttpWebRequest req = WebRequest.Create(args.Url) as HttpWebRequest;
        req.AllowAutoRedirect = true;
        req.Timeout = args.TimeOut;
        req.UserAgent = args.UserAgent;       
        HttpWebResponse answer = req.GetResponse() as HttpWebResponse;

        objResult.Status =answer.StatusCode;       
      }
      catch (WebException ex)
      {
        HttpWebResponse response = ex.Response as HttpWebResponse;
        objResult.Status = response.StatusCode;       
      }

Answer 1

HttpWebRequest在非成功的響應狀態上拋出異常。
此行為是設計使然。

您可以通過捕獲WebException並檢查其Response屬性來獲取Response 。