Individual skill

mvvm-toolkit-messenger

CommunityToolkit.Mvvm Messenger pub/sub for decoupled communication between ViewModels (or any objects). Covers WeakReferenceMessenger vs StrongReferenceMessenger, IRecipient<TMessage>, RequestMessage<T> / AsyncRequestMessage<T> / CollectionRequestMessage<T>, ValueChangedMessage<T>, channels (tokens), and the ObservableRecipient activation lifecycle. Use across WPF, WinUI 3, .NET MAUI, Uno, and Avalonia.

skills/mvvm-toolkit-messenger/SKILL.md

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Last checked: Nov 4, 2026

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Repository stars (not skill ratings): 40,864
Repository last updated: Nov 6, 2026
License: MIT

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# CommunityToolkit.Mvvm Messenger

Pub/sub messaging for ViewModels (or any objects) without forcing a shared
reference graph. Part of `CommunityToolkit.Mvvm` 8.x.

> **TL;DR.** Default to `WeakReferenceMessenger.Default`. Register handlers
> with the `(recipient, message)` lambda and the `static` modifier so you
> never capture `this`. Inherit from `ObservableRecipient` and toggle
> `IsActive` at activation/deactivation to get automatic register/unregister.

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