/DataBoundApp1/App.xaml.cs

using System;

using System.Collections.Generic;

using System.IO.IsolatedStorage;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Navigation;

using System.Windows.Shapes;

using DataBoundApp1.ViewModels;

using Microsoft.Phone.Controls;

using Microsoft.Phone.Shell;



namespace DataBoundApp1

{

	public partial class App : Application

	{

		private static MainViewModel viewModel = null;



		/// <summary>

		/// A static ViewModel used by the views to bind against.

		/// </summary>

		/// <returns>The MainViewModel object.</returns>

		public static MainViewModel ViewModel

		{

			get

			{

				// Delay creation of the view model until necessary

				if (viewModel == null)

					viewModel = new MainViewModel();



				return viewModel;

			}

		}



		/// <summary>

		/// Provides easy access to the root frame of the Phone Application.

		/// </summary>

		/// <returns>The root frame of the Phone Application.</returns>

		public PhoneApplicationFrame RootFrame { get; private set; }



		/// <summary>

		/// Constructor for the Application object.

		/// </summary>

		public App()

		{

			// Global handler for uncaught exceptions. 

			UnhandledException += Application_UnhandledException;



			// Standard Silverlight initialization

			InitializeComponent();



			// Phone-specific initialization

			InitializePhoneApplication();



			// Show graphics profiling information while debugging.

			if (System.Diagnostics.Debugger.IsAttached)

			{

				// Display the current frame rate counters.

				Application.Current.Host.Settings.EnableFrameRateCounter = true;



				// Show the areas of the app that are being redrawn in each frame.

				//Application.Current.Host.Settings.EnableRedrawRegions = true;



				// Enable non-production analysis visualization mode, 

				// which shows areas of a page that are handed off GPU with a colored overlay.

				//Application.Current.Host.Settings.EnableCacheVisualization = true;



				// Disable the application idle detection by setting the UserIdleDetectionMode property of the

				// application's PhoneApplicationService object to Disabled.

				// Caution:- Use this under debug mode only. Application that disables user idle detection will continue to run

				// and consume battery power when the user is not using the phone.

				PhoneApplicationService.Current.UserIdleDetectionMode = IdleDetectionMode.Disabled;

			}



		}



		private void SaveFavorites()

		{

			if (IsolatedStorageSettings.ApplicationSettings.Contains("fav"))

			{

				IsolatedStorageSettings.ApplicationSettings["fav"] = ViewModel.Favorites;

			}

			else

			{

				IsolatedStorageSettings.ApplicationSettings.Add("fav", ViewModel.Favorites);

			}

		}



		// Code to execute when the application is launching (eg, from Start)

		// This code will not execute when the application is reactivated

		private void Application_Launching(object sender, LaunchingEventArgs e)

		{

		}



		// Code to execute when the application is activated (brought to foreground)

		// This code will not execute when the application is first launched

		private void Application_Activated(object sender, ActivatedEventArgs e)

		{

			// Ensure that application state is restored appropriately

			if (!App.ViewModel.IsDataLoaded)

			{

				App.ViewModel.LoadData();

			}

		}



		// Code to execute when the application is deactivated (sent to background)

		// This code will not execute when the application is closing

		private void Application_Deactivated(object sender, DeactivatedEventArgs e)

		{

			SaveFavorites();

		}



		// Code to execute when the application is closing (eg, user hit Back)

		// This code will not execute when the application is deactivated

		private void Application_Closing(object sender, ClosingEventArgs e)

		{

			SaveFavorites();

		}



		// Code to execute if a navigation fails

		private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)

		{

			if (System.Diagnostics.Debugger.IsAttached)

			{

				// A navigation has failed; break into the debugger

				System.Diagnostics.Debugger.Break();

			}

		}



		// Code to execute on Unhandled Exceptions

		private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)

		{

			if (System.Diagnostics.Debugger.IsAttached)

			{

				// An unhandled exception has occurred; break into the debugger

				System.Diagnostics.Debugger.Break();

			}

		}



		#region Phone application initialization



		// Avoid double-initialization

		private bool phoneApplicationInitialized = false;



		// Do not add any additional code to this method

		private void InitializePhoneApplication()

		{

			if (phoneApplicationInitialized)

				return;



			// Create the frame but don't set it as RootVisual yet; this allows the splash

			// screen to remain active until the application is ready to render.

			RootFrame = new PhoneApplicationFrame();

			RootFrame.Navigated += CompleteInitializePhoneApplication;



			// Handle navigation failures

			RootFrame.NavigationFailed += RootFrame_NavigationFailed;



			// Ensure we don't initialize again

			phoneApplicationInitialized = true;

		}



		// Do not add any additional code to this method

		private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)

		{

			// Set the root visual to allow the application to render

			if (RootVisual != RootFrame)

				RootVisual = RootFrame;



			// Remove this handler since it is no longer needed

			RootFrame.Navigated -= CompleteInitializePhoneApplication;

		}



		#endregion

	}

}