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.