委托与事件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    public class CarDealer
    {
        public event EventHandler<CarInfoEventArgs> NewCarInfo;
        public void NewCar(string car)
        {
            Console.WriteLine("CarDealer,new car {0}", car);
            if (NewCarInfo != null)
            {
                NewCarInfo(this, new CarInfoEventArgs(car));
            }
        }
    }
    public class CarInfoEventArgs : EventArgs
    {
        public CarInfoEventArgs(string car)
        {
            this.Car = car;
        }
        public string Car { get; private set; }
    }
    public class Consumer
    {
        private string name;
        public Consumer(string name)
        {
            this.name = name;
        }
        public void NewCarIsHere(object sender,CarInfoEventArgs e)
        {
            Console.WriteLine("{0}:Car {1} is new", name, e.Car);
        }
    }
}
static void Main(string[] args)
        {

            var dealer = new CarDealer();

            var michael = new Consumer("Michael");
            dealer.NewCarInfo += michael.NewCarIsHere;
            dealer.NewCar("Mercedes");
            var nick = new Consumer("Nick");
            dealer.NewCarInfo += nick.NewCarIsHere;
            dealer.NewCar("Ferrari");

            
            dealer.NewCarInfo -= michael.NewCarIsHere;
            dealer.NewCar("Toyota");




            Console.ReadKey();
        }