WindowsMarkupExtensions

Windows Markup Extensions for UWP apps. It requires the Windows Fall Creators Update (16299) as the minimum version.

Get it on nuget:

   PM> Install-Package WindowsMarkupExtensions 

The OnDevice markup extension can be used for DeviceFamily specific property values. It is inspired on the OnPlatform/OnIdiom markup extensions from Xamarin.Forms 3.2, see xamarin/Xamarin.Forms#2608

<Page
    x:Class="TestApp.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    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"
    xmlns:wme="using:ReflectionIT.WindowsMarkupExtensions"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid>
        <TextBlock Text="{wme:OnDevice Desktop=Hello, Xbox=World}"
                   FontSize="{wme:OnDevice Team=42, IoT=60, Default=21}" 
                   HorizontalAlignment="Center" 
                   VerticalAlignment="Center"/>
    </Grid>
</Page>

Run the test app to see it in use.