static void Main(string[] args)
{
Publisher dailyNoise = new Publisher();
// Register a couple of subscribers.
Subscriber joe = new Subscriber("Joe", "Ah, the paper's in my rose bush again!");
joe.Subscribe(dailyNoise);
Subscriber moe = new Subscriber("Moe", "Dang! Soggy paper again!");
moe.Subscribe(dailyNoise);
// Also subscribe from Main() itself.
Console.WriteLine("Main() subscribes.");
dailyNoise.NewEdition += DailyNoise_NewEdition;
// Put out a new edition.
dailyNoise.Publish(DateTime.Today, "Latest Celebrity Arrest!");
// Unsubscribe joe.
joe.UnSubscribe(dailyNoise);
// Put out another edition.
dailyNoise.Publish(new DateTime(2008, 1, 22), "Perp Walks!");
// Unsubscribe moe.
moe.UnSubscribe(dailyNoise);
// Put out another edition.
dailyNoise.Publish(new DateTime(4008, 1, 22), "Busted again?!?");
Console.WriteLine("Main() unsubscribes.");
dailyNoise.NewEdition -= DailyNoise_NewEdition;
// Wait for user to acknowledge results.
Console.WriteLine("Press Enter to terminate...");
Console.Read();
}
// UnSubscribe - Call this method to remove this Subscriber from the list of
// subscribers to the NewEdition event.
public void UnSubscribe(Publisher p)
{
Console.WriteLine("{0} unsubscribes.", Name);
// Note: instead of 'new EventHandler<NewEditionEventArgs>(this.NewEditionPublished)',
// you can use this shorthand form: just give the method name. Compare to Subscribe().
// (You can even put a lambda expression here: see Chapter 16 on lambda expressions.)
p.NewEdition -= this.NewEditionPublished;
}
// Subscribe - Call this method to add this Subscriber to the list of
// subscribers to the NewEdition event.
public void Subscribe(Publisher p)
{
Console.WriteLine("{0} subscribes.", Name);
p.NewEdition += new EventHandler(this.NewEditionPublished);
}