feat: initialize Avalonia demo.

src/Avalonia/Directory.Build.props

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+<Project>
+  <PropertyGroup>
+    <Nullable>enable</Nullable>
+    <AvaloniaVersion>11.0.6</AvaloniaVersion>
+  </PropertyGroup>
+</Project>

src/Avalonia/HandyControlDemo_Avalonia/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="HandyControlDemo.App"
+             RequestedThemeVariant="Default">
+    <Application.Styles>
+        <StyleInclude Source="avares://HandyControl/Themes/Theme.axaml"/>
+        <StyleInclude Source="avares://HandyControlDemo/Resources/Themes/Theme.axaml"/>
+        <!--<FluentTheme />-->
+        <!--<hc:Theme/>-->
+    </Application.Styles>
+</Application>

src/Avalonia/HandyControlDemo_Avalonia/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core.Plugins;
+using Avalonia.Markup.Xaml;
+
+
+namespace HandyControlDemo;
+
+// ReSharper disable once PartialTypeWithSinglePart
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        BindingPlugins.DataValidators.RemoveAt(0);
+
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = new MainWindow();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}

src/Avalonia/HandyControlDemo_Avalonia/HandyControlDemo_Avalonia.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <!--If you are willing to use Windows/MacOS native APIs you will need to create 3 projects.
+    One for Windows with net7.0-windows TFM, one for MacOS with net7.0-macos and one with net7.0 TFM for Linux.-->
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AssemblyName>HandyControlDemo</AssemblyName>
+    <RootNamespace>HandyControlDemo</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove="Resources\Img\cloud.png" />
+    <None Remove="Resources\Img\icon.ico" />
+  </ItemGroup>
+  <ItemGroup>
+    <AvaloniaResource Include="Resources\Img\icon.ico" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia.Desktop" Version="$(AvaloniaVersion)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\HandyControl_Avalonia\HandyControl_Avalonia.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <AvaloniaResource Include="Resources\Img\cloud.png" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Update="App.axaml.cs">
+      <DependentUpon>App.axaml</DependentUpon>
+    </Compile>
+    <Compile Update="Views\Styles\ButtonDemoCtrl.axaml.cs">
+      <DependentUpon>ButtonDemoCtrl.axaml</DependentUpon>
+    </Compile>
+  </ItemGroup>
+</Project>

src/Avalonia/HandyControlDemo_Avalonia/MainWindow.axaml

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+<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:views="clr-namespace:HandyControlDemo.Views"
+        mc:Ignorable="d"
+        d:DesignWidth="800"
+        d:DesignHeight="450"
+        Background="{DynamicResource SecondaryRegionBrush}"
+        Icon="/Resources/Img/icon.ico"
+        x:Class="HandyControlDemo.MainWindow"
+        WindowStartupLocation="CenterScreen"
+        Title="HandyControlDemo">
+	<views:MainWindowContent/>
+</Window>

src/Avalonia/HandyControlDemo_Avalonia/MainWindow.axaml.cs

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

src/Avalonia/HandyControlDemo_Avalonia/Program.cs

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+using System;
+using Avalonia;
+
+namespace HandyControlDemo;
+
+public class Program
+{
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .LogToTrace();
+}

src/Avalonia/HandyControlDemo_Avalonia/Resources/Themes/Basic/Basic.axaml

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+<ResourceDictionary xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+	<ResourceDictionary.MergedDictionaries>
+        <MergeResourceInclude Source="Brushes.axaml"/>
+    </ResourceDictionary.MergedDictionaries>
+</ResourceDictionary>

src/Avalonia/HandyControlDemo_Avalonia/Resources/Themes/Basic/Brushes.axaml

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+<ResourceDictionary xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+	<DrawingBrush x:Key="CloudDrawingBrush" Stretch="Uniform" TileMode="Tile" SourceRect="0 0 157 157" DestinationRect="0 0 157 157" Opacity=".1">
+        <DrawingBrush.Drawing>
+            <ImageDrawing ImageSource="avares://HandyControlDemo/Resources/Img/cloud.png" Rect="0 0 157 157"/>
+        </DrawingBrush.Drawing>
+    </DrawingBrush>
+</ResourceDictionary>

src/Avalonia/HandyControlDemo_Avalonia/Resources/Themes/Theme.axaml

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+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Styles.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <MergeResourceInclude Source="Basic/Basic.axaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Styles.Resources>
+</Styles>

src/Avalonia/HandyControlDemo_Avalonia/Views/Main/MainWindowContent.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:views="clr-namespace:HandyControlDemo.Views"
+             mc:Ignorable="d"
+             d:DesignWidth="800"
+             d:DesignHeight="450"
+             Background="{StaticResource CloudDrawingBrush}"
+             x:Class="HandyControlDemo.Views.MainWindowContent">
+	<Grid MinHeight="300" MinWidth="200" HorizontalAlignment="Center" VerticalAlignment="Center">
+		<Grid.RowDefinitions>
+			<RowDefinition Height="Auto"/>
+			<RowDefinition/>
+		</Grid.RowDefinitions>
+		<Border Grid.RowSpan="2" CornerRadius="10" Background="{DynamicResource RegionBrush}" Effect="{StaticResource EffectShadow4}"/>
+		<Border Grid.Row="0" Height="32" CornerRadius="10 10 0 0" Background="{DynamicResource TitleBrush}">
+            <TextBlock Text="Button" Foreground="{DynamicResource TextIconBrush}" VerticalAlignment="Center" HorizontalAlignment="Center"/>
+        </Border>
+		<views:ButtonDemoCtrl Grid.Row="1"/>
+	</Grid>
+</UserControl>

src/Avalonia/HandyControlDemo_Avalonia/Views/Main/MainWindowContent.axaml.cs

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

src/Avalonia/HandyControlDemo_Avalonia/Views/Styles/ButtonDemoCtrl.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"
+             mc:Ignorable="d"
+             d:DesignWidth="800"
+             d:DesignHeight="450"
+             x:Class="HandyControlDemo.Views.ButtonDemoCtrl">
+	<StackPanel Orientation="Horizontal" VerticalAlignment="Top" Spacing="4" Margin="32">
+        <Button Content="default" />
+        <Button Content="primary" Classes="primary"/>
+        <Button Content="success" Classes="success"/>
+        <Button Content="info" Classes="info"/>
+        <Button Content="warning" Classes="warning"/>
+        <Button Content="danger" Classes="danger"/>
+    </StackPanel>
+</UserControl>

src/Avalonia/HandyControlDemo_Avalonia/Views/Styles/ButtonDemoCtrl.axaml.cs

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

src/Avalonia/HandyControlDemo_Avalonia/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="HandyControlDemo"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

src/Avalonia/HandyControl_Avalonia/HandyControl_Avalonia.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
+    <AssemblyName>HandyControl</AssemblyName>
+    <RootNamespace>HandyControl</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="$(AvaloniaVersion)" />
+  </ItemGroup>
+</Project>

src/Avalonia/HandyControl_Avalonia/Properties/AssemblyInfo.cs

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+using Avalonia.Metadata;
+
+[assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Themes")]
+[assembly: XmlnsPrefix("https://handyorg.github.io/handycontrol", "hc")]

src/Avalonia/HandyControl_Avalonia/Themes/Basic/Brushes.axaml

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+<ResourceDictionary xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <SolidColorBrush x:Key="LightPrimaryBrush" Color="{DynamicResource LightPrimaryColor}"/>
+    <LinearGradientBrush x:Key="PrimaryBrush" EndPoint="1,0" StartPoint="0,0">
+        <GradientStop Color="{DynamicResource PrimaryColor}" Offset="0"/>
+        <GradientStop Color="{DynamicResource DarkPrimaryColor}" Offset="1"/>
+    </LinearGradientBrush>
+    <SolidColorBrush x:Key="DarkPrimaryBrush" Color="{DynamicResource DarkPrimaryColor}"/>
+
+    <SolidColorBrush x:Key="PrimaryTextBrush" Color="{DynamicResource PrimaryTextColor}"/>
+    <SolidColorBrush x:Key="SecondaryTextBrush" Color="{DynamicResource SecondaryTextColor}"/>
+    <SolidColorBrush x:Key="ThirdlyTextBrush" Color="{DynamicResource ThirdlyTextColor}"/>
+    <SolidColorBrush x:Key="ReverseTextBrush" Color="{DynamicResource ReverseTextColor}"/>
+    <SolidColorBrush x:Key="TextIconBrush" Color="{DynamicResource TextIconColor}"/>
+
+    <SolidColorBrush x:Key="BorderBrush" Color="{DynamicResource BorderColor}"/>
+    <SolidColorBrush x:Key="SecondaryBorderBrush" Color="{DynamicResource SecondaryBorderColor}"/>
+    <SolidColorBrush x:Key="BackgroundBrush" Color="{DynamicResource BackgroundColor}"/>
+    <SolidColorBrush x:Key="RegionBrush" Color="{DynamicResource RegionColor}"/>
+    <SolidColorBrush x:Key="SecondaryRegionBrush" Color="{DynamicResource SecondaryRegionColor}"/>
+    <SolidColorBrush x:Key="ThirdlyRegionBrush" Color="{DynamicResource ThirdlyRegionColor}"/>
+    <LinearGradientBrush x:Key="TitleBrush" EndPoint="1,0" StartPoint="0,0">
+        <GradientStop Color="{DynamicResource TitleColor}" Offset="0"/>
+        <GradientStop Color="{DynamicResource SecondaryTitleColor}" Offset="1"/>
+    </LinearGradientBrush>
+
+    <SolidColorBrush x:Key="DefaultBrush" Color="{DynamicResource DefaultColor}"/>
+    <SolidColorBrush x:Key="DarkDefaultBrush" Color="{DynamicResource DarkDefaultColor}"/>
+
+    <SolidColorBrush x:Key="LightDangerBrush" Color="{DynamicResource LightDangerColor}"/>
+    <LinearGradientBrush x:Key="DangerBrush" EndPoint="1,0" StartPoint="0,0">
+        <GradientStop Color="{DynamicResource DangerColor}" Offset="0"/>
+        <GradientStop Color="{DynamicResource DarkDangerColor}" Offset="1"/>
+    </LinearGradientBrush>
+    <SolidColorBrush x:Key="DarkDangerBrush" Color="{DynamicResource DarkDangerColor}"/>
+
+    <SolidColorBrush x:Key="LightWarningBrush" Color="{DynamicResource LightWarningColor}"/>
+    <LinearGradientBrush x:Key="WarningBrush" EndPoint="1,0" StartPoint="0,0">
+        <GradientStop Color="{DynamicResource WarningColor}" Offset="0"/>
+        <GradientStop Color="{DynamicResource DarkWarningColor}" Offset="1"/>
+    </LinearGradientBrush>
+    <SolidColorBrush x:Key="DarkWarningBrush" Color="{DynamicResource DarkWarningColor}"/>
+
+    <SolidColorBrush x:Key="LightInfoBrush" Color="{DynamicResource LightInfoColor}"/>
+    <LinearGradientBrush x:Key="InfoBrush" EndPoint="1,0" StartPoint="0,0">
+        <GradientStop Color="{DynamicResource InfoColor}" Offset="0"/>
+        <GradientStop Color="{DynamicResource DarkInfoColor}" Offset="1"/>
+    </LinearGradientBrush>
+    <SolidColorBrush x:Key="DarkInfoBrush" Color="{DynamicResource DarkInfoColor}"/>
+
+    <SolidColorBrush x:Key="LightSuccessBrush" Color="{DynamicResource LightSuccessColor}"/>
+    <LinearGradientBrush x:Key="SuccessBrush" EndPoint="1,0" StartPoint="0,0">
+        <GradientStop Color="{DynamicResource SuccessColor}" Offset="0"/>
+        <GradientStop Color="{DynamicResource DarkSuccessColor}" Offset="1"/>
+    </LinearGradientBrush>
+    <SolidColorBrush x:Key="DarkSuccessBrush" Color="{DynamicResource DarkSuccessColor}"/>
+
+    <SolidColorBrush x:Key="AccentBrush" Color="{DynamicResource AccentColor}"/>
+    <SolidColorBrush x:Key="DarkAccentBrush" Color="{DynamicResource DarkAccentColor}"/>
+
+    <SolidColorBrush x:Key="DarkMaskBrush" Color="{DynamicResource DarkMaskColor}"/>
+    <SolidColorBrush x:Key="DarkOpacityBrush" Color="{DynamicResource DarkOpacityColor}"/>
+
+</ResourceDictionary>