Implementing “close window” command with MVVM

Question

So my first attempt did everything out of the code behind, and now I\'m trying to refactor my code to use the MVVM pattern, following the guidance of the MVVM in the box inf

Answer 1

MVVM-light with a custom message notification to avoid the window to process every notificationmessage

In the viewmodel:

public class CloseDialogMessage : NotificationMessage
{
    public CloseDialogMessage(object sender) : base(sender, "") { }
}

private void OnClose()
{
    Messenger.Default.Send(new CloseDialogMessage(this));
}

Register the message in the window constructor:

Messenger.Default.Register(this, nm =>
{
    Close();
});