Announcing .NET Community Toolkit 8.4 | Community Feed

The 8.4 release of the .NET Community Toolkit lands one of the MVVM Toolkit’s most requested features — partial property support — alongside a big batch of new analyzers, a migration code fixer, and assorted fixes and performance improvements.

What you’ll learn

Partial properties for [ObservableProperty] — how the .NET 9 SDK’s partial and semi-auto (field keyword) properties let you declare observable properties that integrate cleanly with C#, including custom accessibility, attributes, and modifiers like new, sealed, override, and required
Native AOT for WinRT — why moving to partial properties makes [ObservableProperty] fully AOT safe for UWP and WinUI 3 apps using CsWinRT
A one-click code fixer — how to migrate every [ObservableProperty] field in your solution to partial properties automatically, plus the <LangVersion>preview</LangVersion> requirement to enable it
A wave of new analyzers — the MVVMTK0041–MVVMTK0055 diagnostics that catch invalid declarations, guide AOT-safe patterns, and flag unsupported combinations with [GeneratedBindableCustomProperty]
Other improvements — Windows SDK version validation, attribute forwarding to accessors, a new AsStream() extension over ReadOnlySequence<byte>, and more

Read the full announcement for code examples, the complete diagnostic list, and links to get started with the 8.4 release.