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Asked: 2026-06-18T01:06:42+00:00

I am using the MVVM pattern in my WPF application. In one of my

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I am using the MVVM pattern in my WPF application. In one of my Views I have a button that when clicked uses Commands to talk to its ViewModel. The problem I have is that I need the ViewModel to then talk to other ViewModels to call some of their public methods. I use IOC (Unity) and inject the container into the first ViewModel, so could access the others by using this. I’m not sure if this fits in with the MVVM concept.

Is it possible for all my ViewModels to somehow subscribe to the one button click?
Are any of these the recommended way of solving this problem or is there a better way?

To explain a bit more about my application, each view is a tab control with several textboxes. On the first tab there is also a button and combobox. The user is free to enter their own data or select an option from the combo. In this instance, if the button is then clicked I need all the tabs to load their textboxes based on the selected item in the combo from the first tab. I somehow need to wire this button click in such a way that the value from the combo is passed to all the related viewmodels.

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1 Answer

  1. Editorial Team

    You can use the EventAggregator. Have the command publish an event that the other ViewModels can subscribe to.
    When the event is raised they’ll all get the event, without needing for one VM to know the other VMs

    Another option is to use Composite Commands instead of a regular command.
    Make the command the button uses a composite command, and have the other viewmodels register to that Composite command.

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