Пример #1
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 public void Unsubscribe(IContactObserver observer)
 {
     observers.Remove(observer);
 }
Пример #2
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 public void AddObserver(IContactObserver observer)
 {
     _observers.Add(observer);
 }
Пример #3
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 public void Subscribe(IContactObserver observer)
 {
     observers.Add(observer);
 }