static void Main()
{
ProductNotifier productNotifier = new ProductNotifier();
ProductObserver productObserver = new ProductObserver("*****@*****.**");
productNotifier.Subscribe(productObserver);
productNotifier.Subscribe(new ProductObserver("*****@*****.**"));
productNotifier.Subscribe(new ProductObserver("*****@*****.**"));
Console.ReadKey();
Console.WriteLine("\n\n");
productNotifier.ProductCount++; //increase product count - then all the subscribed members will get notification
Console.ReadKey();
Console.WriteLine("\n\n");
productNotifier.Unsubscribe(productObserver);
Console.ReadKey();
Console.WriteLine("\n\n");
productNotifier.ProductCount++; //increase product count - then all the subscribed members will get notification
Console.ReadKey();
}
public void Unsubscribe(ProductObserver observer)
{
Console.WriteLine(observer.ObserverName + " Unsubscribed from notification");
productObserver.Remove(observer);
}
public void Subscribe(ProductObserver observer)
{
Console.WriteLine(observer.ObserverName + " Subscribed for notification");
productObserver.Add(observer);
}