没有UI线程方法:InvalidOperationException

问题描述 投票:-1回答:1

我在WPF项目中的UI有问题。

概念:

C#中的两个客户端通过聊天与Linux上的Java服务器进行通信。

与其中一位客户,我可以使用'/ kick [user] [reason]'踢另一位聊天者。为了接收从发件人到被踢用户的套接字,我处于异步回调中,因此我很少在UI线程中工作。为解决no-ui方法问题,我使用了Dispatcher。因此,要关闭当前用户界面,我可以这样做

this.Dispatcher.BeginInvoke((System.Threading.ThreadStart)delegate { this.Close(); });

它运行良好,但现在我需要调用另一个UI(用户的连接菜单),但是当我使用“ Show()”方法时,我得到

   'System.InvalidOperationException' in PresentationCore.dll
   at System.Windows.Input.InputManager..ctor()
   at System.Windows.Input.InputManager.GetCurrentInputManagerImpl()
   at System.Windows.Input.KeyboardNavigation..ctor()
   at System.Windows.FrameworkElement.FrameworkServices..ctor()
   at System.Windows.FrameworkElement.EnsureFrameworkServices()
   at System.Windows.FrameworkElement..ctor()
   at System.Windows.Controls.Control..ctor()
   at System.Windows.Window..ctor()

所以我也尝试将其放入Dispatcher

 MainWindow mw = new MainWindow();
 mw.Dispatcher.BeginInvoke((System.Threading.ThreadStart)delegate { mw.Show(); });

但是我遇到相同的错误((System.InvalidOperationException)

该怎么做???

方法:]

数据包接收:(不是很有用,但是也许我可以用其他方式做到这一点...?

    private void callBack(IAsyncResult aResult)
    {
        String message = "";
        try
        {
            int size = sck.EndReceiveFrom(aResult, ref ip);
            if (size > 0)
            {
                byte[] receive = new byte[1024];
                receive = (byte[])aResult.AsyncState;
                message = Encoding.Default.GetString(receive, 0, 1024);
                //class for execute sockets informations that the server sends
                new Event(message, this);
            }
            byte[] buffer = new byte[1024];
            //restart async task
            sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref ip, new AsyncCallback(callBack), buffer);
        }
        catch (Exception) { }
    }

kickUser:

    public void kickUser(String sender, String reason)
    {
        if (!CheckAccess())
        {
            //working well
            this.Dispatcher.BeginInvoke((System.Threading.ThreadStart)delegate { this.Close(); });
            //And here the System.InvalidOperationException
            MainWindow mw = new MainWindow();
            mw.Show();
            //this.Dispatcher.BeginInvoke((System.Threading.ThreadStart)delegate { mw.Show(); });
            //mw.Dispatcher.BeginInvoke((System.Threading.ThreadStart)delegate { mw.Show(); });
            //All do the same OperationException error.
        }
        MessageBox.Show("You get kicked by \"" + sender + "\" for: " + reason, "Server: /kick");
    }
wpf multithreading asynchronous dispatcher invalidoperationexception
1个回答
0
投票

是,我找到了问题!

我只需要创建一个在新的主UI线程中显示窗口的方法。然后,我只需要在关闭the old UI

的委托中调用此方法。
     this.Dispatcher.BeginInvoke((System.Threading.ThreadStart)delegate
     {
         this.Close();
         MainWindow mw = new MainWindow();
         mw.call();
     });

这里是MainWindow类的调用方法((新UI主线程);

    public void call()
    {
        this.Show();
        MessageBox.Show("You get kicked by \"" + "sender" + "\" for: " + "reason", "Server: /kick");
    }
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