private static void Observer()
{
Product product = new Product();
// We have four shops wanting to keep updated price set by product owner
Shop shop1 = new Shop("Shop 1");
Shop shop2 = new Shop("Shop 2");
Shop shop3 = new Shop("Shop 3");
Shop shop4 = new Shop("Shop 4");
//Lets use ArrayList for first two shops
product.Suscribe(shop1);
product.Suscribe(shop2);
//Lets use event-delegate for other two shops
product.Suscribe2(shop3);
product.Suscribe2(shop4);
Console.WriteLine("Todas las tiendas se han suscrito");
//Now lets try chaging the products price, this should update the shops automatically
product.ChangePrice(23.0f); //<------------------Notifica a todas las tiendas
//Now shop2 and shop 4 are not interested in new prices so they unsubscribe
product.Unsuscribe(shop2);
product.Unsuscribe2(shop4);
Console.WriteLine("La tienda 2 y 4 han cancelado su suscripción");
//Now lets try changing the products price again
product.ChangePrice(26.0f);//<------------------Notifica a la tienda 1 y 3
Console.Read();
}
static void Main()
{
Product product = new Product();
product.AddObserver(new CustomerObserver());
product.ChangePrice();
Console.Read();
}