Get Error number in WebException Error

问题

How To Get Error number in WebException Error?

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?
}

回答1:

You'll want to run a test to make sure that it was a ProtocolError:

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

回答2:

For Get Error Number:

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

回答3:

You could try to parse the message, but there isn't always an error number. A timeout for example doesn't result in an HTTP error code.

回答4:

You can't do that because WebException(s) don't have error numbers. You can define your own error numbers if that's what you want/need to do.

Here's the documentation You can get Status, Message, StackTrace, etc, etc.

来源：https://stackoverflow.com/questions/7440922/get-error-number-in-webexception-error