C#의뢰 및 이벤트 단순화

C# 간단한 이벤트 적용

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace TestIO

{

    public delegate double PriceHandler();



    public class PriceManager

    {

        public PriceHandler GetPriceHandler;



        //    ，     100  8.8   ，        

        public double GetPrice()

        {

            //GetPriceHandler.GetInvocationList();        ,             

            if (GetPriceHandler.GetInvocationList().Count() > 0)

            {

                if (GetPriceHandler() > 100)

                    return GetPriceHandler() * 0.88;

                else

                    return GetPriceHandler();

            }

            return -1;

        }

    }



    class Program

    {

        static void Main(string[] args)

        {

            PriceManager priceManager = new PriceManager();



            //  priceManager GetPrice       

            //       Invoke    ，       



            priceManager.GetPriceHandler = new PriceHandler(ComputerPrice);

            Console.WriteLine(string.Format("GetPrice
  Computer's price is {0}!",

                priceManager.GetPrice()));

            //priceManager.GetPrice();

            Console.WriteLine(string.Format("Invoke
  Computer's price is {0}!",

                priceManager.GetPriceHandler.Invoke()));



            Console.WriteLine();



            priceManager.GetPriceHandler = new PriceHandler(BookPrice);

            Console.WriteLine(string.Format("GetPrice
  Book's price is {0}!",

                priceManager.GetPrice()));

            Console.WriteLine(string.Format("Invoke
  Book's price is {0}!",

                priceManager.GetPriceHandler.Invoke()));



            Console.ReadKey();

        }

        //     98  

        public static double BookPrice()

        {

            return 98.0;

        }

        //      8800  

        public static double ComputerPrice()

        {

            return 8800.0;

        }

    } 









}

이 코드는 cnblogs
http://www.cnblogs.com/philzhou/archive/2012/04/05/2433663.html