patterns/observer/template/observer-only.cs - A templates of the Observer class.

Lecture 5 - slide 42 : 45 Program 2

using System.Collections;
namespace Templates.Observer {

 public class Observer {

   private Subject mySubject;

   public Observer (Subject s){
     mySubject = s;
   }   

   public void Update(){
      SubjectState state = mySubject.GetState();

      //   if (the state is interesting){
      //      react on state change
      //   }
   }
 }
}