{

/// <summary>

/// Provides application-specific behavior to supplement the default Application class.

/// </summary>

sealed partial class App : Application

{

/// <summary>

/// 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().

/// </summary>

public App()

{

this.InitializeComponent();

this.Suspending += OnSuspending;

}

/// <summary>

/// Invoked when the application is launched normally by the end user. Other entry points

/// will be used when the application is launched to open a specific file, to display

/// search results, and so forth.

/// </summary>

/// <param name="args">Details about the launch request and process.</param>

protected async override void OnLaunched(LaunchActivatedEventArgs args)

{

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();

HelloWorld.Common.SuspensionManager.RegisterFrame(rootFrame, "appFrame");

if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)

{

//TODO: Load state from previously suspended application

await HelloWorld.Common.SuspensionManager.RestoreAsync();

}

// Place the frame in the current Window

Window.Current.Content = rootFrame;

}

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

if (!rootFrame.Navigate(typeof(MainPage), args.Arguments))

{

throw new Exception("Failed to create initial page");

}

}

// Ensure the current window is active

Window.Current.Activate();

}

/// <summary>

/// 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.

/// </summary>

/// <param name="sender">The source of the suspend request.</param>

/// <param name="e">Details about the suspend request.</param>

private async void OnSuspending(object sender, SuspendingEventArgs e)

{

var deferral = e.SuspendingOperation.GetDeferral();

//TODO: Save application state and stop any background activity

await HelloWorld.Common.SuspensionManager.SaveAsync();

deferral.Complete();

}

}