UWP App Certification Launchactivatedeventargs.Prelaunch

manpreet Best Answer 2 years ago

I'm trying to test my UWP application for submitting it to the store with Microsoft App Certification Kit. The only problem I have is:

in the onlaunched method implementation of the app, ensure you handle the launchactivatedeventargs.prelaunch option to be prelaunch event aware

I've never changed it, I'm using the original project from Visual Studio

sealed partial class App : Application
{
    /// 

    /// Initializes the singleton application object.  This is the first line of authored code
    /// executed, and as such is the logical equivalent of main() or WinMain().
    /// 
    public App()
    {
        this.InitializeComponent();
        this.Suspending += OnSuspending;
    }

    /// 

    /// Invoked when the application is launched normally by the end user.  Other entry points
    /// will be used such as when the application is launched to open a specific file.
    /// 
    /// Details about the launch request and process.
    protected override async void OnLaunched(LaunchActivatedEventArgs e) {
    #if DEBUG
        if (System.Diagnostics.Debugger.IsAttached) {
            this.DebugSettings.EnableFrameRateCounter = true;
        }
    #endif
        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;

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

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

        if (!e.PrelaunchActivated) {
            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(FormView), e.Arguments);
            }

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

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

    /// 

    /// Invoked when Navigation to a certain page fails
    /// 
    /// The Frame which failed navigation
    /// Details about the navigation failure
    void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
    {
        throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
    }

    /// 

    /// Invoked when application execution is being suspended.  Application state is saved
    /// without knowing whether the application will be terminated or resumed with the contents
    /// of memory still intact.
    /// 
    /// The source of the suspend request.
    /// Details about the suspend request.
    private void OnSuspending(object sender, SuspendingEventArgs e)
    {
        var deferral = e.SuspendingOperation.GetDeferral();
        //TODO: Save application state and stop any background activity
        deferral.Complete();
    }
}