WinUI Frame-based navigation and MVVM Toolkit temporary fix

src/NET_8/DateCalculator/DateCalculator.Maui/DateCalculator.Maui.csproj

@@ -19,6 +19,7 @@
         <ImplicitUsings>enable</ImplicitUsings>
         <RootNamespace>DateCalculator</RootNamespace>
         <WindowsPackageType>None</WindowsPackageType>
+        <WindowsSdkPackageVersion>10.0.19041.38</WindowsSdkPackageVersion>
 
         <!-- Display name -->
         <ApplicationTitle>DateCalculator</ApplicationTitle>

src/NET_8/DateCalculator/DateCalculator.WinUI/App.xaml.cs

@@ -1,10 +1,14 @@
+using Microsoft.UI.Xaml.Navigation;
+
 namespace DateCalculator.WinUI
 {
     /// <summary>
     /// Provides application-specific behavior to supplement the default Application class.
     /// </summary>
     public partial class App : Application
     {
+        private Window window = Window.Current;
+
         /// <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().
@@ -18,13 +22,30 @@ public App()
         /// 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="args">Details about the launch request and process.</param>
-        protected override void OnLaunched(LaunchActivatedEventArgs args)
+        /// <param name="e">Details about the launch request and process.</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
         {
-            m_window = new MainWindow();
-            m_window?.Activate();
+            window ??= new Window();
+
+            if (window.Content is not Frame rootFrame)
+            {
+                rootFrame = new Frame();
+                rootFrame.NavigationFailed += OnNavigationFailed;
+                window.Content = rootFrame;
+            }
+
+            _ = rootFrame.Navigate(typeof(MainPage), e.Arguments);
+            window.Activate();
         }
 
-        private Window? m_window;
+        /// <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);
+        }
     }
 }

src/NET_8/DateCalculator/DateCalculator.WinUI/DateCalculator.WinUI.csproj

@@ -9,6 +9,7 @@
         <UseWinUI>true</UseWinUI>
         <EnableMsixTooling>true</EnableMsixTooling>
         <WindowsPackageType>None</WindowsPackageType>
+        <WindowsSdkPackageVersion>10.0.19041.38</WindowsSdkPackageVersion>
 
         <!-- Project Options -->
         <Nullable>enable</Nullable>

src/NET_8/DateCalculator/DateCalculator.WinUI/Imports.cs

@@ -2,4 +2,5 @@
 global using DateCalculator.WinUI.Views;
 
 global using Microsoft.UI.Xaml;
+global using Microsoft.UI.Xaml.Controls;
 global using Microsoft.UI.Xaml.Data;

src/NET_8/DateCalculator/DateCalculator.WinUI/Views/MainWindow.xaml → src/NET_8/DateCalculator/DateCalculator.WinUI/Views/MainPage.xaml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<Window
-    x:Class="DateCalculator.WinUI.Views.MainWindow"
+<Page
+    x:Class="DateCalculator.WinUI.Views.MainPage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:conv="using:DateCalculator.WinUI.Converters"
@@ -9,7 +9,7 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:vm="using:DateCalculator.ViewModels"
     mc:Ignorable="d">
-    <Window.Content>
+    <Page.Content>
         <StackPanel
             x:Name="content"
             Margin="30">
@@ -115,5 +115,5 @@
                 <TextBlock Text="{Binding DiffInDays}" />
             </StackPanel>
         </StackPanel>
-    </Window.Content>
-</Window>
+    </Page.Content>
+</Page>

src/NET_8/DateCalculator/DateCalculator.WinUI/Views/MainWindow.xaml.cs → src/NET_8/DateCalculator/DateCalculator.WinUI/Views/MainPage.xaml.cs

@@ -3,9 +3,9 @@ namespace DateCalculator.WinUI.Views
     /// <summary>
     /// An empty window that can be used on its own or navigated to within a Frame.
     /// </summary>
-    public sealed partial class MainWindow : Window
+    public sealed partial class MainPage : Page
     {
-        public MainWindow()
+        public MainPage()
         {
             this.InitializeComponent();
         }

src/NET_8/UnifiedDateCalculator/DateCalculator.Maui/DateCalculator.Maui.csproj

@@ -18,6 +18,7 @@
         <ImplicitUsings>enable</ImplicitUsings>
         <RootNamespace>DateCalculator.Maui</RootNamespace>
         <WindowsPackageType>None</WindowsPackageType>
+        <WindowsSdkPackageVersion>10.0.19041.38</WindowsSdkPackageVersion>
 
         <!-- Display name -->
         <ApplicationTitle>DateCalculator.Maui</ApplicationTitle>