获取 WebException 错误中的错误号

Question

如何获取WebException错误中的错误号？

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?
}

Answer 1

您需要运行测试以确保它是一个 ProtocolError：

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

Answer 2

对于获取错误号：

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

Answer 3

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