WPF INotifyPropertyChanged for linked read-only properties

Question

I am trying to understand how to update the UI if I have a read-only property that is dependent on another property, so that changes to one property update both UI elements

Answer 1

If you are only using bar for UI purposes, you could remove it from your model completely. You could bind the UI element to the foo property and use a custom value converter to change the result from foo into foo*foo.

In WPF there are often a lot of ways to accomplish the same thing. Often times, there isn't a correct way, just a personal preference.