How to use ThemeService in Uno Platform?

[Rwagsu]

I’m following the official Uno Platform documentation to use ThemeService:
Uno Platform Docs - ThemeService

Issue :

When resolving IThemeService, it consistently throws "service not found" errors. I tried adding .UseToolkit() to enable ThemeService support, but it resolves to ScopedThemeService instead of ThemeService, which causes this exception:

"System.InvalidOperationException: Unable to resolve service for type 'Microsoft.UI.Xaml.Window' while attempting to activate 'Uno.Extensions.Toolkit.ScopedThemeService'."

It seems ScopedThemeService requires dependencies like ILogger, Window, IDispatcher, and ISettings, but I’m stuck because I don’t know which types implement these interfaces.

Goal :

Get the current app theme.
Set a new theme for the application.

Additional Context :

Documentation hints ThemeService might be deprecated in favor of ScopedThemeService, but I can’t confirm this.
No working examples found for retrieving/setting themes with ScopedThemeService.
Any guidance on resolving dependencies or migrating to ScopedThemeService? Thank you 🥲

[nickrandolph]

The Calculator workshop provides an example of how you can use the ThemeService - https://platform.uno/docs/articles/external/uno.samples/reference/SimpleCalc/README.html

[Rwagsu]

Thank you for your ideas, I found GetThemeService extension method😋