相关疑难解决方法(0)

我有以下代码:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "HEAD";
request.Credentials = MyCredentialCache;

try
{
    request.GetResponse();
}
catch
{
}

如何捕获特定的404错误？WebExceptionStatus.ProtocolError只能检测到发生了错误,但未提供错误的确切代码.

例如:

catch (WebException ex)
{
    if (ex.Status != WebExceptionStatus.ProtocolError)
    {
        throw ex;
    }
}

只是没用得多......协议异常可能是401,503,403,真的是什么.