Avalonia/samples/ControlCatalog/Pages/TextBoxPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="ControlCatalog.Pages.TextBoxPage"
             xmlns:sys="clr-namespace:System;assembly=netstandard">
  <StackPanel Orientation="Vertical" Spacing="4">
    <Label Classes="h1">TextBox</Label>
    <Label Classes="h2">A control into which the user can input text</Label>

    <StackPanel Orientation="Horizontal"
              Margin="0,16,0,0"
              HorizontalAlignment="Center"
              Spacing="16">
      <StackPanel Orientation="Vertical" Spacing="8">
        <TextBox Text="Lorem ipsum dolor sit amet, consectetur adipiscing elit." Width="200" />
        <TextBox Width="200" Watermark="ReadOnly" IsReadOnly="True" Text="This is read only"/>
        <TextBox Width="200" Watermark="Watermark" />
        <TextBox Width="200"
                 Watermark="Floating Watermark"
                 UseFloatingWatermark="True"
                 Text="Lorem ipsum dolor sit amet, consectetur adipiscing elit."/>
        
        <TextBox Width="200" Text="Validation Error">
          <DataValidationErrors.Error>
            <sys:Exception /> 
          </DataValidationErrors.Error>
        </TextBox>

        <TextBox Width="200"
                 Watermark="Password Box"
                 Classes="revealPasswordButton"
                 UseFloatingWatermark="True"
                 PasswordChar="*"
                 Text="Password" />
        <TextBox Width="200" Text="Left aligned text" TextAlignment="Left" />
        <TextBox Width="200" Text="Center aligned text" TextAlignment="Center" />
        <TextBox Width="200" Text="Right aligned text" TextAlignment="Right" />
        <TextBox Width="200" Text="Custom selection brush"
                  SelectionStart="5" SelectionEnd="22"
                  SelectionBrush="Green" SelectionForegroundBrush="Yellow"/>
        <TextBox Width="200" Text="Custom caret brush" CaretBrush="DarkOrange"/>
      </StackPanel>

      <StackPanel Orientation="Vertical" Spacing="8">
        <TextBox AcceptsReturn="True" TextWrapping="Wrap" Width="200" Height="125"
                 Text="Multiline TextBox with TextWrapping.&#xD;&#xD;Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est." />
        <TextBox AcceptsReturn="True" Width="200" Height="125"
                 Text="Multiline TextBox with no TextWrapping.&#xD;&#xD;Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa. Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus turpis elit sit amet quam. Vivamus pretium ornare est." />

        <TextBox Classes="clearButton" Text="Clear Content" Width="200" FontWeight="Normal" FontStyle="Normal" Watermark="Watermark" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
      </StackPanel>
      <StackPanel Orientation="Vertical" Spacing="8">
        <Label Classes="h2" Target="{Binding #firstResMFont}">res_m fonts</Label>
        <TextBox Width="200" x:Name="firstResMFont" Text="Custom font regular" FontWeight="Normal" FontStyle="Normal" FontFamily="resm:ControlCatalog.Assets.Fonts?assembly=ControlCatalog#Source Sans Pro"/>
        <TextBox Width="200" Text="Custom font bold" FontWeight="Bold" FontStyle="Normal" FontFamily="resm:ControlCatalog.Assets.Fonts?assembly=ControlCatalog#Source Sans Pro"/>
        <TextBox Width="200" Text="Custom font italic" FontWeight="Normal" FontStyle="Italic" FontFamily="resm:ControlCatalog.Assets.Fonts.SourceSansPro-Italic.ttf?assembly=ControlCatalog#Source Sans Pro"/>
        <TextBox Width="200" Text="Custom font italic bold" FontWeight="Bold" FontStyle="Italic" FontFamily="resm:ControlCatalog.Assets.Fonts.SourceSansPro-*.ttf?assembly=ControlCatalog#Source Sans Pro"/>
      </StackPanel>

      <StackPanel Orientation="Vertical" Spacing="8">
        <Label Classes="h2" Target="{Binding #firstResFont}">_res fonts</Label>
        <TextBox Width="200" x:Name="firstResFont" Text="Custom font regular" FontWeight="Normal" FontStyle="Normal" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
        <TextBox Width="200" Text="Custom font bold" FontWeight="Bold" FontStyle="Normal" FontFamily="avares://ControlCatalog/Assets/Fonts#Source Sans Pro"/>
        <TextBox Width="200" Text="Custom font italic" FontWeight="Normal" FontStyle="Italic" FontFamily="/Assets/Fonts/SourceSansPro-Italic.ttf#Source Sans Pro"/>
        <TextBox Width="200" Text="Custom font italic bold" FontWeight="Bold" FontStyle="Italic" FontFamily="/Assets/Fonts/SourceSansPro-*.ttf#Source Sans Pro"/>
      </StackPanel>
    </StackPanel>
  </StackPanel>
</UserControl>