Revert everything back. Mission failed.

Wino.Mail/BasePage.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Diagnostics;
+using CommunityToolkit.Mvvm.Messaging;
+using Microsoft.Extensions.DependencyInjection;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Navigation;
+using Wino.Core.Messages.Shell;
+using Wino.Core.UWP;
+using Wino.Mail.ViewModels;
+
+namespace Wino
+{
+    public class BasePage : Page, IRecipient<LanguageChanged>
+    {
+        public UIElement ShellContent
+        {
+            get { return (UIElement)GetValue(ShellContentProperty); }
+            set { SetValue(ShellContentProperty, value); }
+        }
+
+        public static readonly DependencyProperty ShellContentProperty = DependencyProperty.Register(nameof(ShellContent), typeof(UIElement), typeof(BasePage), new PropertyMetadata(null));
+
+        public void Receive(LanguageChanged message)
+        {
+            OnLanguageChanged();
+        }
+
+        public virtual void OnLanguageChanged() { }
+    }
+
+    public abstract class BasePage<T> : BasePage where T : BaseViewModel
+    {
+        public T ViewModel { get; } = App.Current.Services.GetService<T>();
+
+        protected BasePage()
+        {
+            ViewModel.Dispatcher = new UWPDispatcher(Dispatcher);
+        }
+
+        ~BasePage()
+        {
+            Debug.WriteLine($"Disposed {this.GetType().Name}");
+        }
+
+        protected override void OnNavigatedTo(NavigationEventArgs e)
+        {
+            base.OnNavigatedTo(e);
+
+            var mode = GetNavigationMode(e.NavigationMode);
+            var parameter = e.Parameter;
+
+            WeakReferenceMessenger.Default.UnregisterAll(this);
+            WeakReferenceMessenger.Default.RegisterAll(this);
+
+            ViewModel.OnNavigatedTo(mode, parameter);
+        }
+
+        protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
+        {
+            base.OnNavigatingFrom(e);
+
+            var mode = GetNavigationMode(e.NavigationMode);
+            var parameter = e.Parameter;
+
+            WeakReferenceMessenger.Default.UnregisterAll(this);
+
+            ViewModel.OnNavigatedFrom(mode, parameter);
+
+            GC.Collect();
+        }
+
+        private Core.Domain.Models.Navigation.NavigationMode GetNavigationMode(NavigationMode mode)
+        {
+            return (Core.Domain.Models.Navigation.NavigationMode)mode;
+        }
+    }
+}