'How do I access Window Resources in WinUI 3

I've just started working on a WinUi 3 (Desktop) project and have got blocked trying to add Window resources to a Window.

I would have thought the following would work. However there appears to be no Resources property.

<Window.Resources>
    
</Window.Resources>
xamlwinui-3


Solution 1:[1]

Apparently it was a design choice, to quote Miguel, a member of Microsoft, from a Github issue:

[...] the Window object doesn't have Resource property like WPF, for instance. It was a design decision [...]

The alternative is to use the dictionary within the component's context, for instance:

<ListView>
  <ListView.Resources>
   <!-- My resources -->
  </ListView.Resources>
</ListView>

Solution 2:[2]

You're right - there are no Window resources. You can have globally shared resources by making App resources, or you can have <page> and <Control> level resources.

What your probably want is to define your resource dictionaries in App.xml

<Application
x:Class="BOMCheck.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:converters="using:CommunityToolkit.WinUI.UI.Converters"
xmlns:helpers="using:BOMCheck.Helpers"
xmlns:local="using:BOMCheck"
xmlns:media="using:Microsoft.UI.Xaml.Media"
RequestedTheme="Light">
<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Rick Stanley
Solution 2 Plastic Sturgeon

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