Setting up source code for Avalonia port.

src/AdvancedCalculator/AdvancedCalculator.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="$(AvaloniaVersion)" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="$(AvaloniaVersion)" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersion)" />
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.0" />
+
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="$(AvaloniaVersion)" />
+  </ItemGroup>
+</Project>

src/AdvancedCalculator/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="AdvancedCalculator.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

src/AdvancedCalculator/App.axaml.cs

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+using AdvancedCalculator.ViewModels;
+using AdvancedCalculator.Views;
+
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core.Plugins;
+using Avalonia.Markup.Xaml;
+
+namespace AdvancedCalculator;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        // Line below is needed to remove Avalonia data validation.
+        // Without this line you will get duplicate validations from both Avalonia and CT
+        BindingPlugins.DataValidators.RemoveAt(0);
+
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainViewModel()
+            };
+        }
+        else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewPlatform)
+        {
+            singleViewPlatform.MainView = new MainView
+            {
+                DataContext = new MainViewModel()
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

src/AdvancedCalculator/ViewModels/MainViewModel.cs

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+namespace AdvancedCalculator.ViewModels;
+
+public partial class MainViewModel : ViewModelBase
+{
+    public string Greeting => "Welcome to Avalonia!";
+}

src/AdvancedCalculator/ViewModels/ViewModelBase.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace AdvancedCalculator.ViewModels;
+
+public class ViewModelBase : ObservableObject
+{
+}

src/AdvancedCalculator/Views/MainView.axaml

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+<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"
+             xmlns:vm="clr-namespace:AdvancedCalculator.ViewModels"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="AdvancedCalculator.Views.MainView"
+             x:DataType="vm:MainViewModel">
+  <Design.DataContext>
+    <!-- This only sets the DataContext for the previewer in an IDE,
+         to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+    <vm:MainViewModel />
+  </Design.DataContext>
+
+  <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+</UserControl>

src/AdvancedCalculator/Views/MainView.axaml.cs

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+using Avalonia.Controls;
+
+namespace AdvancedCalculator.Views;
+
+public partial class MainView : UserControl
+{
+    public MainView()
+    {
+        InitializeComponent();
+    }
+}

src/AdvancedCalculator/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:AdvancedCalculator.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:AdvancedCalculator.Views"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="AdvancedCalculator.Views.MainWindow"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="AdvancedCalculator">
+        <views:MainView />
+</Window>

src/AdvancedCalculator/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace AdvancedCalculator.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}