Init

AvaloniaCrossPlatformTest/App.axaml

@@ -0,0 +1,15 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="using:AvaloniaCrossPlatformTest"
+             x:Class="AvaloniaCrossPlatformTest.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

AvaloniaCrossPlatformTest/App.axaml.cs

@@ -0,0 +1,54 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using System.Linq;
+using Avalonia.Markup.Xaml;
+using AvaloniaCrossPlatformTest.ViewModels;
+using AvaloniaCrossPlatformTest.Views;
+
+namespace AvaloniaCrossPlatformTest;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            // Avoid duplicate validations from both Avalonia and the CommunityToolkit. 
+            // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins
+            DisableAvaloniaDataAnnotationValidation();
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainViewModel()
+            };
+        }
+        else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewPlatform)
+        {
+            singleViewPlatform.MainView = new MainView
+            {
+                DataContext = new MainViewModel()
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private void DisableAvaloniaDataAnnotationValidation()
+    {
+        // Get an array of plugins to remove
+        var dataValidationPluginsToRemove =
+            BindingPlugins.DataValidators.OfType<DataAnnotationsValidationPlugin>().ToArray();
+
+        // remove each entry found
+        foreach (var plugin in dataValidationPluginsToRemove)
+        {
+            BindingPlugins.DataValidators.Remove(plugin);
+        }
+    }
+}

AvaloniaCrossPlatformTest/AvaloniaCrossPlatformTest.csproj

@@ -0,0 +1,24 @@
+<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"/>
+        <PackageReference Include="Avalonia.Themes.Fluent"/>
+        <PackageReference Include="Avalonia.Fonts.Inter"/>
+        <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+        <PackageReference Include="Avalonia.Diagnostics">
+            <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+            <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="CommunityToolkit.Mvvm"/>
+    </ItemGroup>
+</Project>

AvaloniaCrossPlatformTest/ViewLocator.cs

@@ -0,0 +1,30 @@
+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using AvaloniaCrossPlatformTest.ViewModels;
+
+namespace AvaloniaCrossPlatformTest;
+
+public class ViewLocator : IDataTemplate
+{
+    public Control? Build(object? param)
+    {
+        if (param is null)
+            return null;
+
+        var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        var type = Type.GetType(name);
+
+        if (type != null)
+        {
+            return (Control)Activator.CreateInstance(type)!;
+        }
+
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    public bool Match(object? data)
+    {
+        return data is ViewModelBase;
+    }
+}

AvaloniaCrossPlatformTest/ViewModels/MainViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace AvaloniaCrossPlatformTest.ViewModels;
+
+public partial class MainViewModel : ViewModelBase
+{
+    [ObservableProperty] private string _greeting = "Welcome to Avalonia!";
+}

AvaloniaCrossPlatformTest/ViewModels/ViewModelBase.cs

@@ -0,0 +1,7 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace AvaloniaCrossPlatformTest.ViewModels;
+
+public abstract class ViewModelBase : ObservableObject
+{
+}

AvaloniaCrossPlatformTest/Views/MainView.axaml

@@ -0,0 +1,21 @@
+<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:AvaloniaCrossPlatformTest.ViewModels"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="AvaloniaCrossPlatformTest.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>
+
+  <StackPanel>
+      <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+      <Label x:Name="Yee"/>
+      <Button Content="YUHHHHH"
+              Click="Button_OnClick"/>
+  </StackPanel>
+</UserControl>

AvaloniaCrossPlatformTest/Views/MainView.axaml.cs

@@ -0,0 +1,23 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace AvaloniaCrossPlatformTest.Views;
+
+public partial class MainView : UserControl
+{
+
+    private int _count = 0;
+    
+    public MainView()
+    {
+        InitializeComponent();
+        
+        Yee.Content = _count.ToString();
+    }
+
+    private void Button_OnClick(object? sender, RoutedEventArgs e)
+    {
+        _count++;
+        Yee.Content = (_count).ToString();
+    }
+}

AvaloniaCrossPlatformTest/Views/MainWindow.axaml

@@ -0,0 +1,12 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:AvaloniaCrossPlatformTest.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:views="clr-namespace:AvaloniaCrossPlatformTest.Views"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="AvaloniaCrossPlatformTest.Views.MainWindow"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="AvaloniaCrossPlatformTest">
+        <views:MainView />
+</Window>

AvaloniaCrossPlatformTest/Views/MainWindow.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace AvaloniaCrossPlatformTest.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}