Windows Reactor – React like WinUI 3 framework
Microsoft has introduced Microsoft.UI.Reactor, a new declarative, component-based C# framework for building WinUI 3 desktop applications. This framework allows developers to create applications using a familiar React-like approach while maintaining compatibility with existing WinUI controls and XAML. Reactor aims to bridge the gap for developers transitioning from other frameworks by providing a type-safe UI construction method without replacing the traditional XAML/MVVM model.
- ▪Microsoft.UI.Reactor is an experimental framework designed for building WinUI 3 desktop apps.
- ▪Reactor allows for a declarative approach to UI development, enabling co-located state and type-safe UI construction.
- ▪Developers can continue using XAML and MVVM while also integrating Reactor components into their applications.
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Microsoft.UI.Reactor A declarative, component-based C# framework for building WinUI 3 desktop apps. Status: Experimental · April 2026 What Reactor is — and isn't Reactor is not a new UI platform. It is a new way to describe WinUI content. Every control you render is a real WinUI control — Button, TextBox, NavigationView, TreeView — just authored differently. Apps built with Reactor interop freely with XAML, MVVM, existing controls, and the rest of the WinUI ecosystem. What Reactor adds on top of WinUI: A virtual element tree and reconciler that diff old vs.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.