Use compiled bindings insteaed of reflection bindings

src/Controls/MainControl.axaml

@@ -1,5 +1,8 @@
 <UserControl xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-		mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450" x:Class="AvaloniaCoreRTDemo.Controls.MainControl">
+             xmlns:viewModels="clr-namespace:AvaloniaCoreRTDemo.Controls.ViewModels"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450" x:Class="AvaloniaCoreRTDemo.Controls.MainControl"
+			 x:CompileBindings="True"
+			 x:DataType="viewModels:MainViewModel">
 	<Grid ColumnDefinitions="*,*" RowDefinitions="Auto,Auto,*" Margin="32">
 		<TextBlock Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" TextAlignment="Center" Margin="0,6">Welcome to Avalonia UI + NativeAOT!</TextBlock>
 		<Image Grid.Row="1" Grid.Column="0" Stretch="None" Source="{Binding DotNetImage}"/>

src/Windows/AboutWindow.axaml

@@ -1,6 +1,9 @@
 <Window xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:viewModels="clr-namespace:AvaloniaCoreRTDemo.Windows.ViewModels"
         mc:Ignorable="d" x:Class="AvaloniaCoreRTDemo.Windows.AboutWindow" d:DesignWidth="640" d:DesignHeight="256"
-        WindowState="Normal" WindowStartupLocation="CenterOwner" MinHeight="256" MinWidth="640" Height="256" Width="640" MaxHeight="256" MaxWidth="640" Title="About" CanResize="false" ShowInTaskbar="False" Icon="avares://AvaloniaCoreRTDemo/Assets/about.ico">
+        WindowState="Normal" WindowStartupLocation="CenterOwner" MinHeight="256" MinWidth="640" Height="256" Width="640" MaxHeight="256" MaxWidth="640" Title="About" CanResize="false" ShowInTaskbar="False" Icon="avares://AvaloniaCoreRTDemo/Assets/about.ico"
+		x:CompileBindings="True"
+		x:DataType="viewModels:AboutViewModel">
 	<Grid VerticalAlignment="Top" HorizontalAlignment="Left" ColumnDefinitions="Auto,Auto" RowDefinitions="Auto">
 		<Image Margin="0, 60" Grid.Row="0" Grid.Column="0" Stretch="None" Source="{Binding ComputerImage}" VerticalAlignment="Top" HorizontalAlignment="Left">
 			</Image>

src/Windows/MainWindow.axaml

@@ -1,6 +1,10 @@
 <Window xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:controls="clr-namespace:AvaloniaCoreRTDemo.Controls" mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450" x:Class="AvaloniaCoreRTDemo.Windows.MainWindow"
+        xmlns:controls="clr-namespace:AvaloniaCoreRTDemo.Controls"
-        Width="640" Height="480" WindowStartupLocation="CenterScreen" Title="AvaloniaCoreRTDemo" Icon="avares://AvaloniaCoreRTDemo/Assets/app.ico" MinWidth="400" MinHeight="350">
+        xmlns:viewModels1="clr-namespace:AvaloniaCoreRTDemo.Windows.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450" x:Class="AvaloniaCoreRTDemo.Windows.MainWindow"
+        Width="640" Height="480" WindowStartupLocation="CenterScreen" Title="AvaloniaCoreRTDemo" Icon="avares://AvaloniaCoreRTDemo/Assets/app.ico" MinWidth="400" MinHeight="350"
+        x:CompileBindings="True"
+        x:DataType="viewModels1:MainViewModelBase">
     <DockPanel>
         <NativeMenuBar DockPanel.Dock="Top" />
         <controls:MainControl/>
@@ -11,6 +15,7 @@
                 <NativeMenuItem.Menu>
                     <NativeMenu>
                         <NativeMenuItem Header="Exit" Gesture="cmd+e" Command="{Binding FileExitCommand}"/>
+                        <NativeMenuItem Header="About" Gesture="cmd+b" IsEnabled="{Binding AboutEnabled}" Command="{Binding HelpAboutMethod}"/>
                     </NativeMenu>
                 </NativeMenuItem.Menu>
             </NativeMenuItem>

src/Windows/ViewModels/AboutViewModel.cs

@@ -13,19 +13,19 @@ namespace AvaloniaCoreRTDemo.Windows.ViewModels
         private readonly Boolean _darkTheme;
 
         public IBitmap ComputerImage => _computerImage;
-        public static String NCores => Environment.ProcessorCount.ToString();
+        public String NCores => Environment.ProcessorCount.ToString();
-        public static String OS => RuntimeInformation.OSDescription;
+        public String OS => RuntimeInformation.OSDescription;
-        public static String OSArch => RuntimeInformation.OSArchitecture.ToString();
+        public String OSArch => RuntimeInformation.OSArchitecture.ToString();
-        public static String OSVersion => Environment.OSVersion.ToString();
+        public String OSVersion => Environment.OSVersion.ToString();
-        public static String ComputerName => Environment.MachineName;
+        public String ComputerName => Environment.MachineName;
-        public static String UserName => Environment.UserName;
+        public String UserName => Environment.UserName;
-        public static String SystemPath => Environment.SystemDirectory;
+        public String SystemPath => Environment.SystemDirectory;
-        public static String CurrentPath => Environment.CurrentDirectory;
+        public String CurrentPath => Environment.CurrentDirectory;
-        public static String ProcessArch => RuntimeInformation.ProcessArchitecture.ToString();
+        public String ProcessArch => RuntimeInformation.ProcessArchitecture.ToString();
-        public static String RuntimeName => RuntimeInformation.FrameworkDescription;
+        public String RuntimeName => RuntimeInformation.FrameworkDescription;
-        public static String RuntimePath => RuntimeEnvironment.GetRuntimeDirectory();
+        public String RuntimePath => RuntimeEnvironment.GetRuntimeDirectory();
-        public static String RuntimeVersion => RuntimeEnvironment.GetSystemVersion();
+        public String RuntimeVersion => RuntimeEnvironment.GetSystemVersion();
-        public static String FrameworkVersion => Environment.Version.ToString();
+        public String FrameworkVersion => Environment.Version.ToString();
 
         private String ComputerImageName
         {

src/Windows/ViewModels/MainViewModel.cs

@@ -12,53 +12,20 @@ namespace AvaloniaCoreRTDemo.Windows.ViewModels
     {
         private readonly TWindow _window;
 
-        private Boolean _defaultLightEnable = true;
-        private Boolean _defaultDarkEnable = true;
-        private Boolean _fluentLightEnable = true;
-        private Boolean _fluentDarkEnable = true;
-
-        public Boolean DefaultLightEnabled
-        {
-            get => this._defaultLightEnable;
-            set => this.RaiseAndSetIfChanged(ref this._defaultLightEnable, value);
-        }
-
-        public Boolean DefaultDarkEnabled
-        {
-            get => this._defaultDarkEnable;
-            set => this.RaiseAndSetIfChanged(ref this._defaultDarkEnable, value);
-        }
-
-        public Boolean FluentLightEnabled
-        {
-            get => this._fluentLightEnable;
-            set => this.RaiseAndSetIfChanged(ref this._fluentLightEnable, value);
-        }
-
-        public Boolean FluentDarkEnabled
-        {
-            get => this._fluentDarkEnable;
-            set => this.RaiseAndSetIfChanged(ref this._fluentDarkEnable, value);
-        }
-
-        public ReactiveCommand<Unit, Unit> FileExitCommand { get; }
-
         public MainViewModel(TWindow window)
             : base(window.ThemeSwitch)
         {
             this._window = window;
-            this.FileExitCommand = ReactiveCommand.Create(RunFileExit);
             this.ChangeTheme(window.ThemeSwitch.Current);
         }
 
-        public void DefaultLightMethod() => this.ChangeTheme(ApplicationTheme.SimpleLight);
+
-        public void DefaultDarkMethod() => this.ChangeTheme(ApplicationTheme.SimpleDark);
-        public void FluentLightMethod() => this.ChangeTheme(ApplicationTheme.FluentLight);
-        public void FluentDarkMethod() => this.ChangeTheme(ApplicationTheme.FluentDark);
         public override void HelpAboutMethod() => base.RunHelpAbout(this._window);
 
-        private void RunFileExit()
+        public override void DefaultLightMethod() => this.ChangeTheme(ApplicationTheme.SimpleLight);
-            => Environment.Exit(0);
+        public override void DefaultDarkMethod() => this.ChangeTheme(ApplicationTheme.SimpleDark);
+        public override void FluentLightMethod() => this.ChangeTheme(ApplicationTheme.FluentLight);
+        public override void FluentDarkMethod() => this.ChangeTheme(ApplicationTheme.FluentDark);
         
         private void ChangeTheme(ApplicationTheme theme)
         {

src/Windows/ViewModels/MainViewModelBase.cs

@@ -1,5 +1,5 @@
 using System;
-
+using System.Reactive;
 using Avalonia.Controls;
 
 using AvaloniaCoreRTDemo.Interfaces;
@@ -12,6 +12,10 @@ namespace AvaloniaCoreRTDemo.Windows.ViewModels
     {
         private readonly IThemeSwitch _themeSwitch;
         private Boolean _aboutEnable = true;
+        private Boolean _defaultLightEnable = true;
+        private Boolean _defaultDarkEnable = true;
+        private Boolean _fluentLightEnable = true;
+        private Boolean _fluentDarkEnable = true;
 
         public Boolean AboutEnabled
         {
@@ -20,10 +24,47 @@ namespace AvaloniaCoreRTDemo.Windows.ViewModels
         }
 
         public MainViewModelBase(IThemeSwitch window)
-            => this._themeSwitch = window;
+        {
+            this._themeSwitch = window;
+            this.FileExitCommand = ReactiveCommand.Create(RunFileExit);
+        }
+
+        public Boolean DefaultLightEnabled
+        {
+            get => this._defaultLightEnable;
+            set => this.RaiseAndSetIfChanged(ref this._defaultLightEnable, value);
+        }
+
+        public Boolean DefaultDarkEnabled
+        {
+            get => this._defaultDarkEnable;
+            set => this.RaiseAndSetIfChanged(ref this._defaultDarkEnable, value);
+        }
+
+        public Boolean FluentLightEnabled
+        {
+            get => this._fluentLightEnable;
+            set => this.RaiseAndSetIfChanged(ref this._fluentLightEnable, value);
+        }
+
+        public Boolean FluentDarkEnabled
+        {
+            get => this._fluentDarkEnable;
+            set => this.RaiseAndSetIfChanged(ref this._fluentDarkEnable, value);
+        }
+        
+        public ReactiveCommand<Unit, Unit> FileExitCommand { get; }
         
         public abstract void HelpAboutMethod();
 
+        public abstract void DefaultLightMethod();
+        public abstract void DefaultDarkMethod();
+        public abstract void FluentLightMethod();
+        public abstract void FluentDarkMethod();
+        
+        private void RunFileExit()
+            => Environment.Exit(0);
+        
         protected async void RunHelpAbout(Window currentWindow)
         {
             if (this.AboutEnabled)