Handle back button pressed in UWP

This article is all about handling back button pressed in Universal Windows Platform (PC + Mobile). We will use the SystemNavigationManager of Windows.UI.Core namespace in order to handle.

Handle back button for single page

If you just want to handle navigation for single page. Follow the following steps

Step 1. Use namespace Windows.UI.Core

using Windows.UI.Core;

Step 2. Register back request event for current view. Best place for this is main constructor of class after InitializeComponent().

public MainPage()
{
    this.InitializeComponent();
    //register back request event for current view
    SystemNavigationManager.GetForCurrentView().BackRequested += MainPage_BackRequested;
}

Step 3. Handle BackRequested event

private void Food_BackRequested(object sender, BackRequestedEventArgs e)
{
    if (Frame.CanGoBack)
    {
        Frame.GoBack();
        e.Handled = true;
    }
}

For Complete Application at one place for single rootFrame

Best place for handling all backbutton for all Views is App.xaml.cs

Step 1. Use namespace Windows.UI.Core

using Windows.UI.Core;

Step 2. Register back request event for current view. Best place for this is OnLaunched just before Window.Current.Activate and create an event handle for rootFame Navigated event to handle visibility of AppViewBackButton (for PC)

protected override void OnLaunched(LaunchActivatedEventArgs e)
{
    ...
    rootFrame = new Frame();
    rootFrame.Navigated += OnNavigated;
    ...
    SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;
    Window.Current.Activate();
}

Step 3. Handle BackRequested event

private void OnBackRequested(object sender, BackRequestedEventArgs e)
{
    Frame rootFrame = Window.Current.Content as Frame;
    if (rootFrame.CanGoBack)
    {
        rootFrame.GoBack();
        e.Handled = true;
    }
}

Step 4. Manage visibility of AppViewBackButton (for PC)

private void OnNavigated(object sender, NavigationEventArgs e)
{
    // Each time a navigation event occurs, update the Back button's visibility
    SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
        ((Frame)sender).CanGoBack ?
        AppViewBackButtonVisibility.Visible :
        AppViewBackButtonVisibility.Collapsed;
}