How to pass the UI Dispatcher to the ViewModel

Question

I\'m supposed to be able to access the Dispatcher that belongs to the View I need to pass it to the ViewModel. But the View should not know anything about the ViewModel, so

Answer 1

why would not you use

 System.Windows.Application.Current.Dispatcher.Invoke(
         (Action)(() => {ObservableCollectionMemeberOfVM.Add("xx"); } ));

instead of keeping reference to GUI dispatcher.