本地机器上的UWP慢速后退按钮

Question

我正在编写Windows 10通用应用程序，我需要添加普通方法

    private void OnBackRequested(object sender, BackRequestedEventArgs e)
    {
        Frame rootFrame = Window.Current.Content as Frame;


        if (rootFrame == null)
            return;

        if (rootFrame.CanGoBack && e.Handled == false)
        {
            e.Handled = true;
            rootFrame.GoBack();
        }

        //debug
        int stop = 0;
    }

...in my

App.xaml.cs

这将处理设备的后退按钮功能。

我在这里用它：

       protected override void OnLaunched(LaunchActivatedEventArgs e)
    {
        Frame rootFrame = Window.Current.Content as Frame;

        // Do not repeat app initialization when the Window already has content,
        // just ensure that the window is active
        if (rootFrame == null)
        {
            // Create a Frame to act as the navigation context and navigate to the first page
            rootFrame = new Frame();

            rootFrame.NavigationFailed += OnNavigationFailed;
            rootFrame.Navigated += OnNavigated;

            if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
            {
                // TODO: Load state from previously suspended application
            }

            // Place the frame in the current Window
            Window.Current.Content = rootFrame;

            // Register a handler for BackRequested events and set the
            // visibility of the Back button
            SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;

            SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
                rootFrame.CanGoBack ?
                AppViewBackButtonVisibility.Visible :
                AppViewBackButtonVisibility.Collapsed;
        }

        if (rootFrame.Content == null)
        {
            // When the navigation stack isn't restored navigate to the first page,
            // configuring the new page by passing required information as a navigation
            // parameter
            rootFrame.Navigate(typeof(MainPage), e.Arguments);
        }

        // Ensure the current window is active
        Window.Current.Activate();
    }

它可以正常工作，但问题是当我在本地机器上构建并运行并使用Back Button在页面之间导航时，它需要大约5000到6000 ms (5-6秒)才能导航到上一页。

当我调试它时，延迟：

    if (rootFrame.CanGoBack && e.Handled == false)
    {
        e.Handled = true;
        rootFrame.GoBack();
    }

    //debug
    int stop = 0;

rootFrame.GoBack()；并且调试变量"stop“为5,778 ms.，当我在移动仿真程序或移动设备上运行它时，延迟时间缩短到~100 ms。

我会感激是有人能帮助我。谢谢。

Answer 1

我发现了导致延迟的原因，这是我的MainPage文件中的两个SQLite方法，用于从SQLite数据库文件获取很多数据。每次传呼时都叫他们。(放置在页面构造函数中)。我把它们分开上课，一切似乎都很好。