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The Visual Studio 2017 default UWP Application
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<Application | |
x:Class="Sample.App" | |
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | |
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | |
xmlns:local="using:Sample" | |
RequestedTheme="Light" /> |
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using System; | |
using System.Collections.Generic; | |
using System.IO; | |
using System.Linq; | |
using System.Runtime.InteropServices.WindowsRuntime; | |
using Windows.ApplicationModel; | |
using Windows.ApplicationModel.Activation; | |
using Windows.Foundation; | |
using Windows.Foundation.Collections; | |
using Windows.UI.Xaml; | |
using Windows.UI.Xaml.Controls; | |
using Windows.UI.Xaml.Controls.Primitives; | |
using Windows.UI.Xaml.Data; | |
using Windows.UI.Xaml.Input; | |
using Windows.UI.Xaml.Media; | |
using Windows.UI.Xaml.Navigation; | |
namespace Sample | |
{ | |
/// <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 such as when the application is launched to open a specific file. | |
/// </summary> | |
/// <param name="e">Details about the launch request and process.</param> | |
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(); | |
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 == false) | |
{ | |
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(MainPage), e.Arguments); | |
} | |
// Ensure the current window is active | |
Window.Current.Activate(); | |
} | |
} | |
/// <summary> | |
/// Invoked when Navigation to a certain page fails | |
/// </summary> | |
/// <param name="sender">The Frame which failed navigation</param> | |
/// <param name="e">Details about the navigation failure</param> | |
void OnNavigationFailed(object sender, NavigationFailedEventArgs e) | |
{ | |
throw new Exception("Failed to load Page " + e.SourcePageType.FullName); | |
} | |
/// <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 void OnSuspending(object sender, SuspendingEventArgs e) | |
{ | |
var deferral = e.SuspendingOperation.GetDeferral(); | |
//TODO: Save application state and stop any background activity | |
deferral.Complete(); | |
} | |
} | |
} |
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