static void Main(string[] args)
{
DummyProduct product = new DummyProduct();
// 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");
//Attach the shops to the subscriber
product.Attach(shop1);
product.Attach(shop2);
product.Attach(shop3);
product.Attach(shop4);
//changing the products price and the amount, this should update the shops automatically
product.ChangePriceAndAmount(23.0f, 10);
//shop2 and shop 4 are not interested in new prices so they unsubscribe
product.Detach(shop2);
product.Detach(shop4);
//Now lets try changing the products price and amount again
product.ChangePriceAndAmount(26.0f, 20);
Console.Read();
}
public void Detach(Shop product)
{
//detach the observers with subjects
list.Remove(product);
}
public void Attach(Shop product)
{
//attach the observers with subjects
list.Add(product);
}