我有一个非常简单的问题.我正在使用HTTP POST将文件上传到服务器.事情是我需要专门处理连接超时,并在发生超时后添加一些等待算法以重现服务器.
I have a really simple question. I am uploading files to a server using HTTP POST. The thing is I need to specially handle connection timeouts and add a bit of a waiting algorithm after a timeout has occurred to relive the server.
我的代码非常简单:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("SomeURI"); request.Method = "POST"; request.ContentType = "application/octet-stream"; request.KeepAlive = true; request.Accept = "*/*"; request.Timeout = 300000; request.AllowWriteStreamBuffering = false; try { using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { WebHeaderCollection headers = response.Headers; using (Stream Answer = response.GetResponseStream()) { // Handle. } } } catch (WebException e) { if (Timeout_exception) { //Handle timeout exception } }我忽略了文件读取代码,因为这与我们无关.现在,我需要确保一旦引发WebException,就对异常进行过滤以查看它是否确实是超时异常.我曾想将异常消息与之进行比较,但我不确定这是否是正确的方法,因为所讨论的应用程序是商业应用程序,而且恐怕消息会因不同语言而异.以及我要寻找什么消息.
I omitted the file reading code as it is not our concern. Now I need to make sure that once a WebException is thrown, I filter the exception to see if it is indeed a timeout exception. I thought of comparing against the exception message yet I am not sure if this is the right way since the application in question is a commercial app and I am afraid that the message varies between different languages. And what message should I be looking for.
有什么建议吗?
推荐答案您可以查看 WebException.Status . WebExceptionStatus枚举具有Timeout标志:
You can look at WebException.Status. The WebExceptionStatus enum has a Timeout flag:
try { using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { WebHeaderCollection headers = response.Headers; using (Stream answer = response.GetResponseStream()) { // Do stuff } } } catch (WebException e) { if (e.Status == WebExceptionStatus.Timeout) { // Handle timeout exception } else throw; }在这里使用C#6异常过滤器会很方便:
Using C# 6 exception filters can come in handy here:
try { var request = WebRequest.Create("www.google"); using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { WebHeaderCollection headers = response.Headers; using (Stream answer = response.GetResponseStream()) { // Do stuff } } } catch (WebException e) when (e.Status == WebExceptionStatus.Timeout) { // If we got here, it was a timeout exception. }更多推荐
HttpWebRequest超时处理
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