// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=234227
/// Provides application-specific behavior to supplement the default Application class.
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().
this.Suspending += OnSuspending;
/// 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.
/// <param name="args">Details about the launch request and process.</param>
protected 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();
if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
//TODO: Load state from previously suspended application
// 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
if (!rootFrame.Navigate(typeof(MainPage), args.Arguments))
throw new Exception("Failed to create initial page");
// Ensure the current window is active
/// 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.
/// <param name="sender">The source of the suspend request.</param>
/// <param name="e">Details about the suspend request.</param>
private void OnSuspending(object sender, SuspendingEventArgs e)
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: Save application state and stop any background activity
private void OnQuerySubmitted(object sender, SearchPaneQuerySubmittedEventArgs args)
if (MainPage.Current != null)
protected override void OnWindowCreated(WindowCreatedEventArgs args)
// Register QuerySubmitted handler for the window at window creation time and only registered once
// so that the app can receive user queries at any time.
SearchPane.GetForCurrentView().QuerySubmitted += OnQuerySubmitted;
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