Using shared resources

When building graphical user interfaces, you will often want to use a resource such as a brush to paint the background of controls or an instance of a class to perform custom conversions. Resources can be defined at the following levels and shared with everything at that level or lower:

• Application
• Page
• Control

Defining resources to share across an app

A good place to define shared resources is at the app level, so let’s see how to do that:

1. In the Resources folder, in the Styles folder, add a new .NET MAUI Resource Dictionary (XAML) project item named Northwind.xaml.
2. Add markup inside the existing ResourceDictionary element to define a linear gradient brush with a key of rainbow, as shown highlighted in the following markup:

   <?xml version="1.0" encoding="utf-8" ?>
   <ResourceDictionary xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                xmlns...