1.项目下载地址：https://gitee.com/confusedkitten/avalonia-demo

2.UI库Semi.Avalonia，项目地址  https://github.com/irihitech/Semi.Avalonia

样式预览：

axaml代码 ： 

<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="AvaloniaDemo.Pages.Menu">
	<UserControl.Styles>
		<Style Selector="MenuItem">
			<Setter Property="Margin" Value="20 0 20 0" />
			<Setter Property="Foreground" Value="GreenYellow" />
			<Setter Property="Background" Value="Transparent" />
			<Setter Property="FontSize" Value="18" />
			<Setter Property="Padding" Value="20 0 20 0" />
			<Setter Property="FontWeight" Value="Normal"/>
			<Setter Property="Height" Value="45"/>
			<Setter Property="BorderBrush" Value="Gray"/>
			<Setter Property="BorderThickness" Value="1"/>
			<Setter Property="FontFamily" Value="{StaticResource DefaultFontFamily}"/>
		</Style>
	</UserControl.Styles>
	<StackPanel   HorizontalAlignment="Center"  >
		<StackPanel   HorizontalAlignment="Center" >
			<StackPanel.Resources>
				<SolidColorBrush x:Key="MenuFlyoutBackground">#FFFFFF</SolidColorBrush>
			</StackPanel.Resources>
			<Menu Background="Transparent"   >
				<MenuItem Header="MenuItem1"   ></MenuItem>
				<MenuItem Header="MenuItem2"   />
				<MenuItem Header="点它,测试修改背景色"   >
					<MenuItem Header="MenuItem3.1"   />
					<MenuItem Header="MenuItem3.2"   />
					<MenuItem Header="MenuItem3.3"  />
					<MenuItem Header="MenuItem3.4"   Opacity="0.5"/>
					<MenuItem Header="MenuItem3.5"   Opacity="0.5"/>
				</MenuItem>

			</Menu>
		</StackPanel>
		<StackPanel   HorizontalAlignment="Center"  Margin="0 50 0 0">
			<StackPanel.Resources>
				<SolidColorBrush x:Key="MenuFlyoutBackground">#052350</SolidColorBrush>
			</StackPanel.Resources>
			<Menu Background="Transparent"   >
				<MenuItem Header="MenuItem4" Opacity="0.5"/>
				<MenuItem Header="点它,测试修改背景色" >
					<MenuItem Header="MenuItem5.1" />
					<MenuItem Header="MenuItem5.2" />
					<MenuItem Header="MenuItem5.3" />
				</MenuItem>
			</Menu>
		</StackPanel>
	</StackPanel>
</UserControl>