I’m having a hard time to decouple two classes.

I have my code behind (will call it “class A”) that I use to tweak the interface (defined in xaml).

Next I have a class B that is only logic. But while the logic is executing I have to update the UI.

My problem is that I can’t “return” from the class B back to A to update the UI because B has not finished working. And I can’t give the view itself to modifiy to B because it would couple A and B.

I suppose that I have to use some interfaces logic but I don’t know how.

For example :

Class A {      private void OnClickEvent()      {          var B = new(B);          b.work();      }       private void UpdateUI()      {         ...      } }   Class B {     public void work()     {         while (...)         {              ...              //Here, how to call A.UpdateUI() ?              ...         }     } } 

Thanks !