private async Task CreateRootFrame(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();
// TODO: change this value to a cache size that is appropriate for your application
rootFrame.CacheSize = 1;
if (e.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)
{
Type typeOfFirstPage = string.IsNullOrWhiteSpace(SettingsViewModel.Current.MobileServicesUserId)
? typeof(SplashPage)
: await NavigationHelper.DetermineFirstPage();
// If arguments have been passed, e.g. from an NFC tag, then navigate to the appropriate page.
// Set up pages, like create/select baby, take precedence over NFC activation
// but we still need to remember follow the NFC activation once set up is complete by passing
// the existing navigation arguments
if (typeOfFirstPage == typeof(MainPage))
{
typeOfFirstPage = NavigationHelper.DeterminePageFromNavigationArguments(e.Arguments);
}
#if WINDOWS_PHONE_APP
// Removes the turnstile navigation for startup.
if (rootFrame.ContentTransitions != null)
{
this.transitions = new TransitionCollection();
foreach (var c in rootFrame.ContentTransitions)
{
this.transitions.Add(c);
}
}
rootFrame.ContentTransitions = null;
rootFrame.Navigated += this.RootFrame_FirstNavigated;
#endif
// When the navigation stack isn't restored navigate to the first page,
// configuring the new page by passing required information as a navigation
// parameter
if (!rootFrame.Navigate(typeOfFirstPage, e.Arguments))
{
throw new Exception("Failed to create initial page");
}
}
}