不应该有Application.ShutDown();或. exit()消息。

Application是一个静态类。它不指向当前应用程序。 你需要进入当前应用程序，然后像这样关闭它:

Application.Current.Shutdown();

Application.Current.ShutdownMode = ShutdownMode.OnExplicitShutdown;

private void _MenuExit_Click(object sender, RoutedEventArgs e)
{
   System.Windows.Application.Current.MainWindow.Close();
}

//Override the onClose method in the Application Main window

protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
    MessageBoxResult result =   MessageBox.Show("Do you really want to close", "",
                                          MessageBoxButton.OKCancel);
    if (result == MessageBoxResult.Cancel)
    {
       e.Cancel = true;
    }
    base.OnClosing(e);
}

在xaml代码中，你可以调用一个预定义的SystemCommand:

Command="SystemCommands.MinimizeWindowCommand"

我认为这应该是首选的方式……

如果你想从另一个没有创建应用程序对象的线程中退出，请使用:

Caliburn微调味

public class CloseAppResult : CancelResult
{
    public override void Execute(CoroutineExecutionContext context)
    {
        Application.Current.Shutdown();
        base.Execute(context);
    }
}

public class CancelResult : Result
{
    public override void Execute(CoroutineExecutionContext context)
    {
        OnCompleted(this, new ResultCompletionEventArgs { WasCancelled = true });
    }
}