Question

我正在编写Windows 10 Universal App，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;
    }

...在我的

App.xaml.cs

将处理设备的后退按钮功能。

我在这里使用它：

       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();
    }

它的工作正常，但问题是当我在本地机器上构建和运行并使用后退按钮在页面之间导航时，需要大约5000 - 6000毫秒（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（）;和调试变量“stop”是5,778 ms ....，当我在Mobile Emulator或Mobile Device上运行时，延迟时间减少到~100ms

如果有人能够提供帮助，我将不胜感激。感谢。

Answer 1

我找到了导致延迟的原因，我的MainPage文件中有两个SQL事务方法，用于从SQLite数据库文件中获取大量数据。每次调用分页时都会调用它们。（放在页面构造函数中）。我把它们分开来，并且每个人都很好。

本地机器上的UWP慢速后退按钮

1 个答案: