Update completed solution for chapter 8

Chapter08/Complete/MyMediaCollection/App.xaml.cs

@@ -3,13 +3,17 @@ using Microsoft.Extensions.Hosting;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using Microsoft.UI.Xaml.Navigation;
+using Microsoft.Windows.AppLifecycle;
+using Microsoft.Windows.AppNotifications;
+using MyMediaCollection.Helpers;
 using MyMediaCollection.Interfaces;
 using MyMediaCollection.Services;
 using MyMediaCollection.ViewModels;
 using MyMediaCollection.Views;
 using System;
-using System.Net;
+using System.Runtime.InteropServices;
 using System.Threading.Tasks;
+using WinRT.Interop;
 
 namespace MyMediaCollection
 {
@@ -18,6 +22,11 @@ namespace MyMediaCollection
     /// </summary>
     public partial class App : Application
     {
+        [DllImport("user32.dll", SetLastError = true)]
+        static extern void SwitchToThisWindow(IntPtr hWnd, bool turnOn);
+
+        private NotificationManager notificationManager;
+
         public static IHost HostContainer { get; private set; }
 
         /// <summary>
@@ -27,13 +36,45 @@ namespace MyMediaCollection
         public App()
         {
             this.InitializeComponent();
+            notificationManager = new NotificationManager();
+            notificationManager.Init();
+            AppDomain.CurrentDomain.ProcessExit += CurrentDomain_ProcessExit;
+        }
+
+        private void CurrentDomain_ProcessExit(object sender, EventArgs e)
+        {
+            notificationManager.Unregister();
+        }
+
+        public static void ToForeground()
+        {
+            if (m_window != null)
+            {
+                IntPtr handle = WindowNative.GetWindowHandle(m_window);
+                if (handle != IntPtr.Zero)
+                {
+                    SwitchToThisWindow(handle, true);
+                }
+            }
+        }
+
+        public static string GetFullPathToExe()
+        {
+            var path = AppDomain.CurrentDomain.BaseDirectory;
+            var pos = path.LastIndexOf("\\");
+            return path.Substring(0, pos);
+        }
+
+        public static string GetFullPathToAsset(string assetName)
+        {
+            return $"{GetFullPathToExe()}\\Assets\\{assetName}";
         }
 
         /// <summary>
         /// Invoked when the application is launched.
         /// </summary>
         /// <param name="args">Details about the launch request and process.</param>
-        protected override async void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        protected override async void OnLaunched(LaunchActivatedEventArgs args)
         {
             m_window = new MainWindow();
             var rootFrame = new Frame();
@@ -41,6 +82,22 @@ namespace MyMediaCollection
             rootFrame.NavigationFailed += RootFrame_NavigationFailed;
             rootFrame.Navigate(typeof(MainPage), args);
             m_window.Content = rootFrame;
+
+            var currentInstance = AppInstance.GetCurrent();
+            if (currentInstance.IsCurrent)
+            {
+                AppActivationArguments activationArgs = currentInstance.GetActivatedEventArgs();
+                if (activationArgs != null)
+                {
+                    ExtendedActivationKind extendedKind = activationArgs.Kind;
+                    if (extendedKind == ExtendedActivationKind.AppNotification)
+                    {
+                        var notificationActivatedEventArgs = (AppNotificationActivatedEventArgs)activationArgs.Data;
+                        notificationManager.ProcessLaunchActivationArgs(notificationActivatedEventArgs);
+                    }
+                }
+            }
+
             m_window.Activate();
         }
 
@@ -49,7 +106,7 @@ namespace MyMediaCollection
             throw new Exception($"Error loading page {e.SourcePageType.FullName}");
         }
 
-        private Window m_window;
+        private static Window m_window;
 
         internal Window Window => m_window;