How to call method in window (.xaml.cs) from viewmodel (.cs) without introducing new references in wpf

Question

I\'m looking for a simple way to call a method in my Main Window, but I want to call it from my View Model. Basically, I\'m looking for some king of \"this.parent\" sort of

Answer 1

VM should "know" nothing of your View or Window, the way VM typically "communicates" with V in WPF/MVVM is by rasing events. That way VM remains ignorant of/decoupled from the V and since VM is already DataContext of V it's not hard to subscribe to VM's event.

Example:

VM:

public event EventHandler> DoSomething;
...
Notify(DoSomething, new NotificationEventArgs("Message"));

V:

var vm = DataContext as SomeViewModel; //Get VM from view's DataContext
if (vm == null) return; //Check if conversion succeeded
vm.DoSomething += DoSomething; // Subscribe to event

private void DoSomething(object sender, NotificationEventArgs e)
{
    // Code    
}