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Adding WinUI 2 to an Uno Platform application

The WinUI 2 library provides additional controls above those that are available in the UWP framework. This article explains how to use WinUI 2 controls in an Uno Platform application.

Tip

If you're looking for information on WinUI 3, which is a total replacement for UWP XAML, read our WinUI 3 explainer or our WinUI 3 upgrade guide.

Enabling WinUI 2 controls

  1. In the UWP head project of your solution, install the WinUI 2 NuGet package.

  2. There's no extra package to install for non-Windows head projects - the WinUI 2 controls are already included in the Uno.UI NuGet package which is installed with the default Uno Platform template.

  3. Open the App.xaml file inside the shared project used by all platform heads. Add the XamlControlsResources resource dictionary to your application resources inside App.xaml.

    	<Application>
		<Application.Resources>
			<XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
		</Application.Resources>
	</Application>

    Or, if you have other existing application-scope resources, add XamlControlsResources at the top (before other resources) as a merged dictionary:

    	<Application.Resources>
		<ResourceDictionary>
			<ResourceDictionary.MergedDictionaries>
				<XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
				<!-- Other merged dictionaries here -->
			</ResourceDictionary.MergedDictionaries>
			<!-- Other app resources here -->
		</ResourceDictionary>
	</Application.Resources>

  4. Now you're ready to use WinUI 2 controls in your application. Sample usage for the NumberBox control:

    <Page x:Class="UnoLovesWinUI.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UnoLovesWinUI"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:winui="using:Microsoft.UI.Xaml.Controls"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <winui:NumberBox />
    </Grid>
</Page>