Semi.Avalonia/demo/Semi.Avalonia.Demo/Pages/NumericUpDownDemo.axaml

<UserControl
    x:Class="Semi.Avalonia.Demo.Pages.NumericUpDownDemo"
    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"
    d:DesignHeight="450"
    d:DesignWidth="800"
    mc:Ignorable="d">
    <StackPanel HorizontalAlignment="Left" Spacing="20">
        <StackPanel Orientation="Horizontal">
            <NumericUpDown Classes="Large" Width="150" ButtonSpinnerLocation="Left"/>
            <NumericUpDown Width="150" ShowButtonSpinner="False" />
            <NumericUpDown Classes="Small" Width="150" />
        </StackPanel>

        <StackPanel Orientation="Horizontal">
            <NumericUpDown Width="150" ButtonSpinnerLocation="Left" />
            <NumericUpDown Width="150" ShowButtonSpinner="False" />
            <NumericUpDown Width="150" />
        </StackPanel>

        <StackPanel Orientation="Horizontal">
            <NumericUpDown Width="150" ShowButtonSpinner="False" />
            <NumericUpDown IsEnabled="False" Width="150" />
            <NumericUpDown Width="150" ButtonSpinnerLocation="Left" />
        </StackPanel>

        <NumericUpDown
            Width="200"
            Maximum="100"
            Minimum="0" />
        <NumericUpDown
            Width="200"
            Increment="10"
            Maximum="100"
            Minimum="0" />
        <NumericUpDown
            Width="200"
            ButtonSpinnerLocation="Left"
            Maximum="100"
            Minimum="0" />
        <NumericUpDown
            Width="200"
            Maximum="100"
            Minimum="0"
            ShowButtonSpinner="False" />
        <NumericUpDown
            Width="200"
            Classes="Large"
            Maximum="100"
            Minimum="0" />
        <NumericUpDown
            Width="200"
            Classes="Small"
            Maximum="100"
            Minimum="0" />
        <NumericUpDown
            Width="200"
            InnerLeftContent="Price"
            InnerRightContent="$"
            Maximum="100"
            Minimum="0" />
    </StackPanel>
</UserControl>