Avalonia/samples/ControlCatalog/Pages/NumericUpDownPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:sys="clr-namespace:System;assembly=netstandard"
             x:Class="ControlCatalog.Pages.NumericUpDownPage">
  <StackPanel Orientation="Vertical" Spacing="4">
    <TextBlock Margin="2" Classes="h1">Numeric up-down control</TextBlock>
    <TextBlock Margin="2" Classes="h2" TextWrapping="Wrap">Numeric up-down control provides a TextBox with button spinners that allow incrementing and decrementing numeric values by using the spinner buttons, keyboard up/down arrows, or mouse wheel.</TextBlock>

    <TextBlock Margin="2,5,2,2" FontSize="14" FontWeight="Bold">Features:</TextBlock>
    <Grid Margin="2" ColumnDefinitions="Auto,Auto,Auto,Auto" RowDefinitions="Auto,Auto">
      <Grid Grid.Row="0" Grid.Column="0" ColumnDefinitions="Auto, Auto" RowDefinitions="Auto,Auto,Auto,Auto,Auto">
        <TextBlock Grid.Row="0" Grid.Column="0" VerticalAlignment="Center" Margin="2">ShowButtonSpinner:</TextBlock>
        <CheckBox Grid.Row="0" Grid.Column="1" IsChecked="{Binding #upDown.ShowButtonSpinner}" VerticalAlignment="Center" Margin="2"/>

        <TextBlock Grid.Row="1" Grid.Column="0" VerticalAlignment="Center" Margin="2">IsReadOnly:</TextBlock>
        <CheckBox Grid.Row="1" Grid.Column="1" IsChecked="{Binding #upDown.IsReadOnly}" VerticalAlignment="Center" Margin="2"/>

        <TextBlock Grid.Row="2" Grid.Column="0" VerticalAlignment="Center" Margin="2">AllowSpin:</TextBlock>
        <CheckBox Grid.Row="2" Grid.Column="1" IsChecked="{Binding #upDown.AllowSpin}" VerticalAlignment="Center" Margin="2"/>

        <TextBlock Grid.Row="3" Grid.Column="0" VerticalAlignment="Center" Margin="2">ClipValueToMinMax:</TextBlock>
        <CheckBox Grid.Row="3" Grid.Column="1" IsChecked="{Binding #upDown.ClipValueToMinMax}" VerticalAlignment="Center" Margin="2"/>

      </Grid>
      <Grid Grid.Row="0" Grid.Column="1" Margin="10,2,2,2" ColumnDefinitions="Auto, 120" RowDefinitions="Auto,Auto,Auto,Auto,Auto">
        <TextBlock Grid.Row="0" Grid.Column="0" VerticalAlignment="Center" Margin="2">FormatString:</TextBlock>
        <ComboBox Grid.Row="0" Grid.Column="1" Items="{Binding Formats}" SelectedItem="{Binding SelectedFormat}"
                  VerticalAlignment="Center" Margin="2">
          <ComboBox.ItemTemplate>
            <DataTemplate>
              <StackPanel Orientation="Horizontal" Spacing="2">
                <TextBlock Text="{Binding Name}"/>
                <TextBlock Text="-"/>
                <TextBlock Text="{Binding Value}"/>
              </StackPanel>
            </DataTemplate>
          </ComboBox.ItemTemplate>
        </ComboBox>

        <TextBlock Grid.Row="1" Grid.Column="0" VerticalAlignment="Center" Margin="2">ButtonSpinnerLocation:</TextBlock>
        <ComboBox Grid.Row="1" Grid.Column="1" Items="{Binding SpinnerLocations}" SelectedItem="{Binding #upDown.ButtonSpinnerLocation}"
                  VerticalAlignment="Center" Margin="2"/>

        <TextBlock Grid.Row="2" Grid.Column="0" VerticalAlignment="Center" Margin="2">CultureInfo:</TextBlock>
        <ComboBox Grid.Row="2" Grid.Column="1" Items="{Binding Cultures}" SelectedItem="{Binding #upDown.CultureInfo}"
                  VerticalAlignment="Center" Margin="2"/>

        <TextBlock Grid.Row="3" Grid.Column="0" VerticalAlignment="Center" Margin="2">Watermark:</TextBlock>
        <TextBox Grid.Row="3" Grid.Column="1" Text="{Binding #upDown.Watermark}" VerticalAlignment="Center" Margin="2" />

        <TextBlock Grid.Row="4" Grid.Column="0" VerticalAlignment="Center" Margin="2">Text:</TextBlock>
        <TextBox Grid.Row="4" Grid.Column="1" Text="{Binding #upDown.Text}" VerticalAlignment="Center" Margin="2" />
      </Grid>
      <Grid Grid.Row="0" Grid.Column="2" Margin="10,2,2,2" RowDefinitions="Auto,Auto,Auto,Auto,Auto" ColumnDefinitions="Auto, Auto">
        <TextBlock Grid.Row="0" Grid.Column="0" VerticalAlignment="Center" Margin="10,2,2,2">Minimum:</TextBlock>
        <NumericUpDown Grid.Row="0" Grid.Column="1" Value="{Binding #upDown.Minimum}"
                       CultureInfo="{Binding #upDown.CultureInfo}" VerticalAlignment="Center" Margin="2" HorizontalAlignment="Center"/>

        <TextBlock Grid.Row="1" Grid.Column="0" VerticalAlignment="Center" Margin="10,2,2,2">Maximum:</TextBlock>
        <NumericUpDown Grid.Row="1" Grid.Column="1" Value="{Binding #upDown.Maximum}"
                       CultureInfo="{Binding #upDown.CultureInfo}" VerticalAlignment="Center" Margin="2" HorizontalAlignment="Center"/>

        <TextBlock Grid.Row="2" Grid.Column="0" VerticalAlignment="Center" Margin="10,2,2,2">Increment:</TextBlock>
        <NumericUpDown Grid.Row="2" Grid.Column="1" Value="{Binding #upDown.Increment}" VerticalAlignment="Center"
                       Margin="2" HorizontalAlignment="Center"/>

        <TextBlock Grid.Row="3" Grid.Column="0" VerticalAlignment="Center" Margin="10,2,2,2">Value:</TextBlock>
        <NumericUpDown Grid.Row="3" Grid.Column="1" Value="{Binding #upDown.Value}" VerticalAlignment="Center"
                       Margin="2" HorizontalAlignment="Center"/>

      </Grid>
    </Grid>

    <StackPanel Margin="2,10,2,2" Orientation="Horizontal" Spacing="10">
      <TextBlock FontSize="14" FontWeight="Bold" VerticalAlignment="Center">Usage of NumericUpDown:</TextBlock>
      <NumericUpDown Name="upDown" Minimum="0" Maximum="10" Increment="0.5"
                     CultureInfo="en-US" VerticalAlignment="Center"
                     Watermark="Enter text" FormatString="{Binding SelectedFormat.Value}"/>
      
      <TextBlock FontSize="14" FontWeight="Bold" VerticalAlignment="Center">NumericUpDown with Validation Errors:</TextBlock>
      <NumericUpDown Minimum="0" Maximum="10" Increment="0.5"
                     CultureInfo="en-US" VerticalAlignment="Center"
                     Watermark="Enter text" FormatString="{Binding SelectedFormat.Value}">
        <DataValidationErrors.Error>
          <sys:Exception /> 
        </DataValidationErrors.Error>
      </NumericUpDown>
    </StackPanel>

  </StackPanel>
</UserControl>