禁用按钮是要在整个事件结束后才会响应(转载)

最新推荐文章于 2022-07-30 15:54:00 发布

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本文介绍了一个在WPF应用程序中实现按钮禁用并延迟重新启用的方法。通过使用Dispatcher操作来确保在特定事件（如长时间运行的操作）完成后才重新启用按钮。此方法利用了DispatcherFrame和DispatcherOperation来控制UI线程的行为。

[size=medium]禁用按钮是要在整个事件结束后才会响应[/size]


public class WpfApplication
    {
        private static DispatcherOperationCallback exitFrameCallback = new DispatcherOperationCallback(ExitFrame);

        public static void DoEvents()
        {
            DispatcherFrame nestedFrame = new DispatcherFrame();
            DispatcherOperation exitOperation = Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background, exitFrameCallback, nestedFrame);

            Dispatcher.PushFrame(nestedFrame);
            if (exitOperation.Status != DispatcherOperationStatus.Completed)
            {
                exitOperation.Abort();
            }
        }

        private static Object ExitFrame(Object state)
        {
            DispatcherFrame frame = state as DispatcherFrame;
            frame.Continue = false;
            return null;
        }
    }


private void button_Click(object sender, RoutedEventArgs e)
        {
            button.IsEnabled = false;
            WpfApplication.DoEvents();
            i++;
            button.Content = i.ToString();
            System.Threading.Thread.Sleep(2000);
            button.IsEnabled = true;
        }