通常，当一个函数正在发生时，对UI的任何更新都会被阻止，直到函数结束。这是因为帧直到函数结束才被推动。您可以通过调用这样的方法来强制执行此更新;

void AllowUIToUpdate()
    {
        DispatcherFrame frame = new DispatcherFrame();
        Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Render, new DispatcherOperationCallback(delegate (object parameter)
        {
            frame.Continue = false;
            return null;
        }), null);

        Dispatcher.PushFrame(frame);
        //EDIT:
        Application.Current.Dispatcher.Invoke(DispatcherPriority.Background,
                                      new Action(delegate { }));
    }

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编辑：我在AllowUIToUpdate函数中添加了额外的一行，现在一切都如预期的那样运行了！

对@刘易斯_Heslop答案的改进，它可以完美地与MVVM一起工作：

private static void AllowUIToUpdate()
{
    DispatcherFrame frame = new();
    // DispatcherPriority set to Input, the highest priority
    Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Input, new DispatcherOperationCallback(delegate (object parameter)
    {
        frame.Continue = false;
        Thread.Sleep(20); // Stop all processes to make sure the UI update is perform
        return null;
    }), null);
    Dispatcher.PushFrame(frame);
    // DispatcherPriority set to Input, the highest priority
    Application.Current.Dispatcher.Invoke(DispatcherPriority.Input, new Action(delegate { }));
}

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