델리게이트와 비슷하다고, 또는 같다고 보셔도 무방합니다.

다음의 예제는 Head First C#에서 빌려왔습니다.

델리게이트를 먼저 공부하신 후, 녹색으로 색칠한 부분을 눈여겨 보시면 이해가 빠를 것이라 생각됩니다.

    public class Ball
    {
        public event EventHandler BallInPlay;
 

        public void OnBallInPlay(BallEventArgs e)
        {
            if (BallInPlay != null)
            {
                BallInPlay(this, e); // 델리게이트와 동작하는 방식은 거의 같습니다.
            }
        }
    }
 
 
 
    public class BallEventArgs : EventArgs
    {
        public int Trajectory { get; private set; }
        public int Distance { get; private set; }
 

        public BallEventArgs(int Trajectory, int Distance)
        {
            this.Trajectory = Trajectory;
            this.Distance = Distance;
        }
    }
 
    public class Fan
    {
        public Fan(Ball ball)
        {
            ball.BallInPlay += new EventHandler(ball_BallInPlay);
        }
 
 
 
        public void ball_BallInPlay(object sender, EventArgs e)
        {
            if (e is BallEventArgs)
            {
                BallEventArgs ballEventArgs = e as BallEventArgs;
                if (ballEventArgs.Distance > 400 && ballEventArgs.Trajectory > 30)
                {
                    Console.WriteLine("Fan: Home Run! I'm going for the ball!");
                }
                else
                {
                    Console.WriteLine("Fan: Woo-hoo! Yeah!");
                }
            }
        }
    }
 
 
 
    public class Pitcher
    {
        public Pitcher(Ball ball)
        {
            ball.BallInPlay += new EventHandler(ball_BallInPlay);
        }
 
 
 
        void ball_BallInPlay(object sender, EventArgs e)
        {
            if (e is BallEventArgs)
            {
                BallEventArgs ballEventArgs = e as BallEventArgs;
                if (ballEventArgs.Distance < 95 && ballEventArgs.Trajectory < 60)
                {
                    CatchBall();
                }
                else
                {
                    CorverFirstBase();
                }
            }
        }
 
 
 
        private void CatchBall()
        {
            Console.WriteLine("Pitcher: I caught the ball!");
        }
 
 
 
        private void CorverFirstBase()
        {
            Console.WriteLine("Pitcher: I corvered first base.");
        }
    }
 
 
 
    class Program
    {
        static void Main(string[] args)
        {
            Ball ball = new Ball();
            Pitcher pitcher = new Pitcher(ball);
            Fan fan = new Fan(ball);
 
 
 
            BallEventArgs ballEventArgs = new BallEventArgs(100, 40);
            ball.OnBallInPlay(ballEventArgs);
        }
    }