mvvm-toolkit-messenger
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 thestaticmodifier so you never capturethis. Inherit fromObservableRecipientand toggleIsActiveat activation/deactivation to get automatic register/unregister.
When to use this skill
- Two or more ViewModels need to react to an event (login, theme change, save, navigation) without holding references to each other
- A ViewModel needs to ask another VM for a value (request/reply)
- You're scoping events to a sub-system or window with channel tokens
- Diagnosing "my handler never fires" or weak-reference recipient lifetime
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