Question

我编写了一个C＃程序，它每5秒发布一次HTTP心跳请求，它在开始时运行良好，但在大约20-40分钟之后，它继续在方法HttpWebRequest.BeginGetRequestStream（）（或HttpWebResponse.EndGetResponse）上抛出webException。（）如果我不需要发布数据）。

我在一些特定的计算机上遇到了这个问题，这些计算机的性能并不好。

我做了几次尝试，但仍然得到了相同的结果：

更改其他服务器地址
使用socket发布http请求，并在新的套接字（在socket.connect（）之前）获取socketException
异步和同步http请求
使用.net 4.0（我目前使用.net3.5）
winForm和WPF程序中的代码几乎相同
确保不使用代理或防火墙

这是异常堆栈跟踪：

   System.Net.WebException: the underlying connection was closed:unable to connect to the remote server. 
---> System.Net.Sockets.SocketException: an invalid argument was supplied.
at System.Net.Sockets.Socket..ctor(AddressFamily addressFamily, SocketType socketType, ProtocolType protocolType)
at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout)
at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback)
at System.Net.Connection.CompleteStartConnection(Boolean async, HttpWebRequest httpWebRequest)

这是我的代码的核心部分：

    public MainWindow()
    {
        InitializeComponent();
        timer = new Timer(new TimerCallback(delegate (object obj)
        {
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "GET";
                request.KeepAlive = false;
                IAsyncResult result = request.BeginGetResponse(new AsyncCallback(ResponseCallback), request);
                ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), request, 15000, true);
            }
            catch(Exception e)
            {
                Console.WriteLine(e.ToString());
            }
        }), null, Timeout.Infinite, Timeout.Infinite);
    }

    private void TimeoutCallback(object state, bool timeout)
    {
        if (timeout)
        {
            HttpWebRequest request = state as HttpWebRequest;
            if (request != null)
            {
                request.Abort();
            }
        }
    }

    private void ResponseCallback(IAsyncResult result)
    {
        try
        {
            HttpWebRequest request = (HttpWebRequest)result.AsyncState;
            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(result);

            Stream responseStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responseStream);
            string responseString = reader.ReadToEnd();
            responseStream.Close();
            reader.Close();
            response.Close();

            Console.WriteLine(responseString);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }
    }

我认为代码没有任何问题，也许是.net问题或网络问题，如果有人给我一些建议，我将非常感激。

c＃在运行一段时间后抛出webexception和socketexception

0 个答案: