c# - 如何(真正)取消 Windows Phone 上的 ConnectAsync 请求？

Question

我正在开发一个将连接到我的服务器的 Windows Phone 应用程序。它通过在您按下登录按钮时使用 ConnectAsync 来实现。但是如果服务器宕机了，你想取消连接尝试，怎么办？

这是我最近尝试关闭套接字连接时完成的当前客户端代码。假设您知道如何关闭连接后就可以轻松实现超时。

    private IPAddress ServerAddress = new IPAddress(0xff00ff00); //Censored my IP
    private int ServerPort = 13000;
    private Socket CurrentSocket;
    private SocketAsyncEventArgs CurrentSocketEventArgs;
    private bool Connecting = false;

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            if (Connecting)
            {
                CurrentSocket.Close();
                CurrentSocket.Dispose();
                CurrentSocketEventArgs.Dispose();
                CurrentSocket = null;
                CurrentSocketEventArgs = null;
            }
            UserData userdata = new UserData();
            userdata.Username = usernameBox.Text;
            userdata.Password = passwordBox.Password;

            Connecting = ConnectToServer(userdata);
        }
        catch (Exception exception)
        {
            Dispatcher.BeginInvoke(() => MessageBox.Show("Error: " + exception.Message));
        }
    }

    private bool ConnectToServer(UserData userdata)
    {
        CurrentSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        //Create a new SocketAsyncEventArgs
        CurrentSocketEventArgs = new SocketAsyncEventArgs();
        CurrentSocketEventArgs.RemoteEndPoint = new IPEndPoint(ServerAddress, ServerPort);
        CurrentSocketEventArgs.Completed += ConnectionCompleted;
        CurrentSocketEventArgs.UserToken = userdata;
        CurrentSocketEventArgs.SetBuffer(new byte[1024], 0, 1024);

        CurrentSocket.ConnectAsync(CurrentSocketEventArgs);
        return true;
    }

编辑:让我印象深刻的一个想法是，即使服务器软件没有打开，也许是服务器计算机在请求时堆积起来？那可能吗？

Answer 1

我相信

socket.Close()

应该取消异步连接尝试。因此可能需要捕获一些异常。