Microsoft has released .NET Community Toolkit 8.4, with support for partial properties in MVVM Toolkit source generators as well as new MVVM Toolkit diagnostic analyzers.

The update was unveiled December 12. Source code for the .NET Community Toolkit can be found on GitHub.

Partial properties now are available thanks to new C# language features in the .NET 9 SDK. MVVM Toolkit source generators now will leverage partial properties and semi-auto properties for defining observable properties. Declaring properties is now integrated with the C# language, instead of the MVVM Toolkit creating a new property and inferring its characteristics based on the annotated field. .NET Community Toolkit 8.4 also introduces 16 new diagnostics to the set of analyzers in the MVVM Toolkit, providing both general code analysis for MVVM scenarios and CsWinRT trim/AOT code analysis for UWP and WinUI 3.