Close, Hide, Move borderless window without passing Window instance MVVM Light

Question

Hi everyone,
I'm now working with an app which is on MVVM Model, and I'm using MVVM Light to make that app . I wonder if I can close the current window and open another one without passing Window instance or not . I've seen a way which helps me to close the current window
without passing the instance through MVVM Command :
return new RelayCommand(() => Application.Current.Windows.Cast<Window>().Single(w => w.DataContext == this).Close());
But what if I handle the MouseDown event, I have to use LinQ so many times.
Can anyone help me please ?

Answer 1

If you want to do something with a window without having a reference to it, you could send a message from a class using the Messenger and then subscribe to this message in the window class itself and close it or do whatever from there.
public class CloseWindowMessage
ViewModel:
return new RelayCommand(() => { GalaSoft.MvvmLight.Messaging.Messenger.Default.Send<CloseWindowMessage>(new CloseWindowMessage()); } );
Window:
GalaSoft.MvvmLight.Messaging.Messenger.Default.Register<CloseWindowMessage>
this,
(action) => this.Close()
Please refer to the following links for more information about how to use the Messenger in MVVM Light:
http://stackoverflow.com/questions/16993918/mvvm-light-messenger-sending-and-registering-objects
https://msdn.microsoft.com/en-us/magazine/dn745866.aspx
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