WPF窗口在加载后立即自动关闭

Question

WPF MainWindow显示1秒后将自动关闭。我在wpf项目中只有这个主窗口。运行该应用程序时没有错误显示。在不显示任何错误的情况下，MainWindow加载后不久便关闭了。 App.xaml.cs中没有任何代码。

这是在MainWindow中编写的代码。

   public partial class MainWindow : Window
    {
      private Socket clientSocket;
      private byte[] buffer;

      public MainWindow()
      {
        InitializeComponent();
      }

      private bool CheckField()
      {
        if (txtIP.Text == string.Empty)
        {
            MessageBox.Show("Please specify IP Address");
            return false;
        }

        if (txtPort.Text == string.Empty)
        {
            MessageBox.Show("Please specify Port Number");
            return false;
        }

        return true;
    }

     private void btnGreen_Click(object sender, RoutedEventArgs e)
     {
        if(CheckField()) SendMessage("GREEN");
     }

     private void btnRed_Click(object sender, RoutedEventArgs e)
     {
        if (CheckField()) SendMessage("RED");
     }

     private void Window_Loaded(object sender, RoutedEventArgs e)
     {          
        try
        {
            clientSocket = new Socket(AddressFamily.InterNetwork, 
            SocketType.Stream, ProtocolType.Tcp);

            // if below code commented, window will not close

            clientSocket.BeginConnect(new IPEndPoint(IPAddress.Loopback, 
            3333), new AsyncCallback(ConnectCallback), null);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
     }

     private void ConnectCallback(IAsyncResult ar)
     {
        clientSocket.EndConnect(ar);
     }    

     public void SendMessage(string xmlstring)
     {
        try
        {
            byte[] xmlbuffer = Encoding.ASCII.GetBytes(xmlstring);
            clientSocket.BeginSend(xmlbuffer, 0, xmlbuffer.Length, 
            SocketFlags.None, new AsyncCallback(SendCallback), null);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
      }

      private void SendCallback(IAsyncResult ar)
      {
        clientSocket.EndSend(ar);
        buffer = new byte[clientSocket.ReceiveBufferSize];
      }

   }

这是怎么了？