This document provides an overview of Windows Runtime apps and navigation between pages in a Windows Runtime app. It discusses how apps are suspended and resumed, and how the navigation frame is used to navigate between pages using the Frame.Navigate method. It also describes how the hardware back button can be handled to navigate back or close secondary UI elements on a page.

1. Windows Runtime Apps
Jaliya Udagedara
MVP (Visual C#)

7. Windows Store App
Windows Phone Store App

8. Windows Runtime Apps

10. Windows Runtime contains
more than 90% of Windows
Phone Runtime

19. protected override async void OnLaunched(LaunchActivatedEventArgs e)
{
ApplicationExecutionState state = e.PreviousExecutionState;
ActivationKind kind = e.Kind;
///...
}

20. • App is suspended
• All code stopped
• No timers tick
• No events fire
• Process still alive and in memory
• Code has a chance to respond
(next slide)

21. private async void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
await SuspensionManager.SaveAsync();
deferral.Complete();
}

22. • Same app is resumed
• Same process, same memory so
values of variables are intact
• All code runs
• Code has a chance to respond.
Launch Switcher

23. public App()
{
this.InitializeComponent();
this.Suspending += this.OnSuspending;
this.Resuming += App_Resuming;
}
void App_Resuming(object sender, object e)
{
// TODO: whatever you need to do to resume your app
}

24. http://bit.ly/w8Resuming

28. Window
Frame
Page
Window

29. 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();
...
// Place the frame in the current Window
Window.Current.Content = rootFrame;
}
if (rootFrame.Content == null)
{
// Navigate to the first page
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
// Ensure the current window is active
Window.Current.Activate();
}

30. private void itemListView_ItemClick(object sender, ItemClickEventArgs e)
{
// Navigate to the appropriate destination page, configuring the new page
// by passing required information as a navigation parameter
var itemId = ((MyListViewItem)e.ClickedItem).UniqueId;
Frame.Navigate(typeof(MyDetailPage), itemId);
}

31. private void btnGoBack_Click(
object sender, RoutedEventArgs e)
{
if (this.Frame.CanGoBack)
this.Frame.GoBack();
}

34. public sealed partial class SecondPage : Page
{
...
protected override void OnNavigatedTo(NavigationEventArgs e)
{
Windows.Phone.UI.Input.HardwareButtons.BackPressed += HardwareButtons_BackPressed;
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
Windows.Phone.UI.Input.HardwareButtons.BackPressed -= HardwareButtons_BackPressed;
}
async void HardwareButtons_BackPressed(object sender, Windows.Phone.UI.Input.BackPressedEventArgs e)
{
e.Handled = true; // We've handled this button press
if (SecondaryUI.Visibility == Visibility.Visible ) // If the secondary UI is visible, hide it
{
FadeOutSecondaryStoryboard.Begin();
}
else
{
if (Frame.CanGoBack)
Frame.GoBack();
}
}

40. Add Windows Phone 8.1 or Windows 8.1

41. Context Switcher in the Editor

42. Context Switcher in the XAML Editor

43. Better IntelliSense

44. Devices Window

45. Switching Startup Projects

48. • Universal App

49. Thank You!
http://www.jaliyaudagedara.blogspot.com/