/// <summary>
/// Initializes the Frame and its content.
/// </summary>
/// <param name="args">The <see cref="IActivatedEventArgs"/> instance containing the event data.</param>
/// <returns>A task of a Frame that holds the app content.</returns>
protected virtual async Task <Frame> InitializeFrameAsync(IActivatedEventArgs args)
{
CreateAndConfigureContainer();
EventAggregator = CreateEventAggregator();
// Create a Frame to act as the navigation context and navigate to the first page
var rootFrame = CreateRootFrame();
if (ExtendedSplashScreenFactory != null)
{
Page extendedSplashScreen = ExtendedSplashScreenFactory.Invoke(args.SplashScreen);
rootFrame.Content = extendedSplashScreen;
}
var frameFacade = new FrameFacadeAdapter(rootFrame, EventAggregator);
//Initialize PrismApplication common services
SessionStateService = CreateSessionStateService();
//Configure VisualStateAwarePage with the ability to get the session state for its frame
SessionStateAwarePage.GetSessionStateForFrame =
frame => SessionStateService.GetSessionStateForFrame(frameFacade);
//Associate the frame with a key
SessionStateService.RegisterFrame(frameFacade, "AppFrame");
NavigationService = CreateNavigationService(frameFacade, SessionStateService);
DeviceGestureService = CreateDeviceGestureService();
DeviceGestureService.GoBackRequested += OnGoBackRequested;
DeviceGestureService.GoForwardRequested += OnGoForwardRequested;
// Set a factory for the ViewModelLocator to use the default resolution mechanism to construct view models
Logger.Log("Configuring ViewModelLocator", Category.Debug, Priority.Low);
ConfigureViewModelLocator();
OnRegisterKnownTypesForSerialization();
bool canRestore = await SessionStateService.CanRestoreSessionStateAsync();
bool shouldRestore = canRestore && ShouldRestoreState(args);
if (shouldRestore)
{
await SessionStateService.RestoreSessionStateAsync();
}
await OnInitializeAsync(args);
if (shouldRestore)
{
// Restore the saved session state and navigate to the last page visited
try
{
SessionStateService.RestoreFrameState();
NavigationService.RestoreSavedNavigation();
_isRestoringFromTermination = true;
}
catch (SessionStateServiceException)
{
// Something went wrong restoring state.
// Assume there is no state and continue
}
}
return(rootFrame);
}
protected virtual async Task <Frame> InitializeFrameAsync(IActivatedEventArgs args)
{
var services = CreateServices();
var rootFrame = CreateRootFrame(services);
var eventAggregator = CreateEventAggregator(services);
var frameFacade = CreateFrameFacade(services, rootFrame, eventAggregator);
this.SessionStateService = CreateSessionStateService(services);
this.NavigationService = CreateNavigationService(services, frameFacade, this.SessionStateService);
services.AddSingleton <Frame>(rootFrame);
services.AddSingleton <IEventAggregator>(eventAggregator);
services.AddSingleton <IFrameFacade>(frameFacade);
services.AddSingleton <ISessionStateService>(this.SessionStateService);
services.AddSingleton <INavigationService>(this.NavigationService);
ConfigureServices(services);
if (ExtendedSplashScreenFactory != null)
{
Page extendedSplashScreen = ExtendedSplashScreenFactory.Invoke(args.SplashScreen);
rootFrame.Content = extendedSplashScreen;
}
this.Provider = services.BuildServiceProvider();
var deviceGestureService = this.Provider.GetRequiredService <IDeviceGestureService>();
SessionStateAwarePage.GetSessionStateForFrame =
frame => SessionStateService.GetSessionStateForFrame(frameFacade);
//Associate the frame with a key
SessionStateService.RegisterFrame(frameFacade, "AppFrame");
deviceGestureService.GoBackRequested += OnGoBackRequested;
deviceGestureService.GoForwardRequested += OnGoForwardRequested;
deviceGestureService.UseTitleBarBackButton = true;
ConfigureViewModelLocator();
OnRegisterKnownTypesForSerialization();
bool canRestore = await SessionStateService.CanRestoreSessionStateAsync();
bool shouldRestore = canRestore && ShouldRestoreState(args);
if (shouldRestore)
{
await SessionStateService.RestoreSessionStateAsync();
}
Configure(this.Provider);
await OnInitializeAsync(args);
if (shouldRestore)
{
// Restore the saved session state and navigate to the last page visited
try
{
SessionStateService.RestoreFrameState();
NavigationService.RestoreSavedNavigation();
_isRestoringFromTermination = true;
}
catch (SessionStateServiceException)
{
// Something went wrong restoring state.
// Assume there is no state and continue
}
}
return(rootFrame);
}
