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Messaging

IMessageHub: weak subscribe by default, recipient-first handlers, and when to use a command or a service instead.

Messaging

The handler must use the recipient argument so a weak subscribe does not pin the ViewModel. Do not write (msg) => this.Refresh() — that captures this and defeats the weak table.

hub.Subscribe<HomeViewModel, CartChanged>(
    this,
    static (vm, _) => vm.Refresh(),
    weak: true);

Discussion

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