如何从异步方法回调中更新c#wpf中的gui

本文关键字：更新 c#wpf 中的 gui 回调 异步方法 | 更新日期: 2023-09-27 18:09:54

我在stackoverflow和net上搜索过，但找不到问题的解决方案。

我以异步方式从流中读取。我想回调以更新gui

[STAThread]
    private void ClientLoggedCallback(IAsyncResult res)
    {
        try
        {
            MailClient.Helpers.Client.getInstance().client.GetStream().EndWrite(res);
            MailClient.Helpers.Client.getInstance().asyncRecieveEncryptedProtocolMessage(new AsyncCallback(LoginInfo_recieved));
        }
        catch { }
    }
    [STAThread]
    private void LoginInfo_recieved(IAsyncResult res)
    {
        try
        {
            MailClient.Helpers.Client.getInstance().client.GetStream().EndRead(res);
            MailClient.AsyncState state = (MailClient.AsyncState)res.AsyncState;
            string answer = Aes.DecryptStringFromBytes_Aes(state.buffer, state.AES_KEY, state.AES_IV);
            if (answer.Contains("OK"))
            {
                string[] answer_params = answer.Split(',');
                LoggedUserInfo.USER_ID = Convert.ToInt32(answer_params[1]);
                LoggedUserInfo.USER_LOGIN = answer_params[2];
                //zalogowano
                //this.TargetWindow = new MessageListsWindow();
                Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Background, new Action(() => this.TargetWindow = new MessageListsWindow()));
                //System.Windows.Application.Current.Dispatcher.Invoke(DispatcherPriority.Background,  new Action(() => this.TargetWindow = new MessageListsWindow()));
            }
            else
            {
                //zle dane
                System.Windows.MessageBox.Show("Zle dane");
            }
        }
        catch(Exception exep) { }
    }

这是asyncSendEncryptedProtocolMessage 的声明

asyncSendEncryptedProtocolMessage(string message, AsyncCallback callBack)

使用功能

clientStream.BeginWrite(encryptedMessage, 0, encryptedMessage.Length, callBack, st);

当代码执行时，我得到异常"调用线程必须是STA，因为许多UI组件都需要它。"我读过"SetApartmentState(ApartmentState.STA(；"，但我不知道如何将其应用于回调。我也尝试过使用STAThread属性，但它不起作用。我使用MVVM Light框架。

StackTrace

" w System.Windows.Threading.DispatcherObject.VerifyAccess()'r'n   w System.Windows.Application.get_MainWindow()'r'n   w MailClient.ViewModel.MainWindowModel.LoginInfo_recieved(IAsyncResult res) w c:''Users''oem''Documents''Visual Studio 2012''Projects''MvvmLight3''MailClient''ViewModel''MainWindowModel.cs:wiersz 171"

如何从异步方法回调中更新c#wpf中的gui

 public static void Dispatch(this DispatcherObject source, Action func)
    {
        if (source.Dispatcher.CheckAccess())
            func();
        else
            source.Dispatcher.Invoke(func);
    }

然后像这样使用：

MailClient.Helpers.Client.getInstance()
.asyncRecieveEncryptedProtocolMessage(new AsyncCallback(()=> 
Application.Current.MainWindow.Dispatch(LoginInfo_recieved)));
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