Understanding Unity and Injection Dependencies with MVVM and Prism

I started using the Microsoft Prism framework with Unity for a WPF application, mainly to teach me new concepts.

I'm trying to understand dependency injection and how to use Unity with my view modes, but I don't have a close enough understanding of what I'm doing to even really ask what I'm doing wrong.

Hence, I will go over the scenario I am in and hope someone can help me figure out where I am going wrong.

Consider an EventAggregator script that publishes ModuleA and subscribes ModuleB. In my ModuleA MainWindowViewModel

, I would have a class like this:

private IEventAggregator _eventAggregator;
public MainWindowViewModel(IEventAggregator eventAggregator) {
    _eventAggregator = eventAggregator;
    ...
}

      

        
        
        
      

    

Now when I register my ModuleA MainWindowView

, I would do something like this:

public class ModuleA {
    private readonly IRegionManager _regionManager;
    public ModuleA(IRegionManager regionManager) {
        _regionManager = regionManager;
    }

    public void Initialize() {
        _regionManager.RegisterViewWithRegion("SomeRegion", typeof(MainWindowView));
    }
}

      

        
        
        
      

    

Then, in my project Bootstrapper.cs

, I would create mine ModuleCatalog

:

public class Bootstrapper {
    ...
    protected override void ConfigureModuleCatalog() {
        base.ConfigureModuleCatalog();
        ModuleCatalog moduleCatalog = (ModuleCatalog)this.ModuleCatalog;

        moduleCatalog.AddModule(typeof(ModuleA.ModuleA));
        ...
    }
}

      

        
        
        
      

    

Now I could use ServiceLocator

to instantiate my eventAggregator

in my ViewModel, but I'm trying to do this through Dependency Injection by registering the ViewModel with IUnityContainer

and then adding my View as needed. Also, I see all the time that I have to use an interface for my ViewModel (i.e. IMainWindowViewModel

) to separate concerns.

Can anyone point me to a resource that could clear up the apparent confusion I have? I've read MSDN Prism QuickStarts, including Advanced MVVM Scenarios, but I don't understand how to contextualize the instructions.