Communicate two view models in WPF MVVM [closed]

Answer 1

I would use a IService that is implemented by each view model. Then in the view models you can pass the service properties to properties of the view model that implement INotifypropertychanged. For example, I have a service called INavigationService that is implemented by my view models and it has properties like CanNavigate, currentView etc that I bind to in my view models. Changes to these properties can cause navigation or change properties that other view models are binding to.