在 WebException 错误中获取错误编号

Question

如何在WebException错误中获取错误编号？

try
{
     HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("site");
     HttpWebResponse response = (HttpWebResponse)request.GetResponse();
     Stream stream = response.GetResponseStream();
     int i = stream.ReadByte();
}
catch (WebException e)
{
     //How To Get Error number in WebException Error?
}

- Ali Yousefi

Answer 1

你需要运行一个测试来确保它是一个ProtocolError：

if (e.Status == WebExceptionStatus.ProtocolError) 
{
    Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
    Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
}

- Neil Knight

---

如何获取HTTP子状态值？例如，404.13内容长度过大。参考：http://www.iis.net/configreference/system.webserver/security/requestfiltering/requestlimits - Kiquenet

Answer 2

获取错误编号：

catch(System.Net.WebException e)
{
    int errorNumber = (int)e.Status;
}

- Ali Yousefi

Answer 3

您可以尝试解析该消息，但并不总是有错误编号。例如，超时并不会导致 HTTP 错误代码。

- Guffa