static void Main(string[] args)
{
Subject subject = new Subject();
//Observer1 takes a subscription to the subject
Observer observerOne = new Observer("observer 1");
subject.Subscribe(observerOne);
Console.WriteLine("Add first item");
subject.Inventory++;
// Observer2 also subscribes to the store
subject.Subscribe(new Observer("Observer 2"));
Console.WriteLine("Add second item");
subject.Inventory++;
// Observer1 unsubscribes and Observer3 subscribes to notifications.
subject.Unsubscribe(observerOne);
subject.Subscribe(new Observer("Observer 3"));
Console.WriteLine("Add third item");
subject.Inventory++;
Console.ReadLine();
}
static void Main(string[] args)
{
Subject subject = new Subject();
// Observer1 takes a subscription to the store
Observer observer1 = new Observer("Observer 1");
subject.Subscribe(observer1);
// Observer2 also subscribes to the store
subject.Subscribe(new Observer("Observer 2"));
subject.Inventory++;
// Observer1 unsubscribes and Observer3 subscribes to notifications.
subject.Unsubscribe(observer1);
subject.Subscribe(new Observer("Observer 3"));
subject.Inventory++;
Console.ReadLine();
}