public void AddObserver(KeyValueObserver observer) { if (!observers.Contains(observer)) observers.Add(observer); }
public void RemoveObserver(KeyValueObserver observer) { if (observers.Contains(observer)) observers.Remove(observer); }
public void AddObserver(KeyValueObserver observer) { if (!observers.Contains(observer)) observers.Add(observer); }
public void RemoveObserver(KeyValueObserver observer) { if (observers.Contains(observer)) observers.Remove(observer); }