我怎样才能捕捉到 404?

How can I catch a 404?(我怎样才能捕捉到 404?)

问题描述

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，而不能给出错误的确切代码.

How can I catch a specific 404 error? The WebExceptionStatus.ProtocolError can only detect that an error occurred, but not give the exact code of the error.

例如:

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

只是还不够有用...协议异常可能是 401、503、403 等等.

Is just not useful enough... the protocol exception could be 401, 503, 403, anything really.

推荐答案

使用HttpStatusCode Enumeration，特别是HttpStatusCode.NotFound

类似于:

HttpWebResponse errorResponse = we.Response as HttpWebResponse;
if (errorResponse.StatusCode == HttpStatusCode.NotFound) {
  //
}

在哪里
we 是一个 WebException.

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