灵活的算法处理（委托学习系列二）

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

namespace DelegateDEMO
{
    public delegate int ArithmeticDelegate(int a , int b);

    //根据传入的方法地址，进行计算
    public class Arithmetic
    {
        private ArithmeticDelegate arithmeticOperate;
        public ArithmeticDelegate ArithmeticOperate 
        {
            get { return arithmeticOperate; }
            set { this.arithmeticOperate = value; }
        }

        //在客户端没有传入方法之前，这个方法是不确定的
        public int DoSomething(int a, int b)
        {
            return ArithmeticOperate(a, b);
        }
    }

    //已经实现的具体方法
    public class ArithmeticFounction 
    {
        public int Add(int a, int b)
        {
            return a + b;
        }

        public int Sub(int a, int b)
        {
            return a - b;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            ArithmeticFounction af = new ArithmeticFounction();

            Arithmetic a = new Arithmetic();
            //将具体方法地址传入，则a可用传入方法进行运算了
            a.ArithmeticOperate = new ArithmeticDelegate(af.Sub);
            //DoSomething现在已经是Sub方法
            int Result = a.DoSomething(20, 3);

            Console.Write(Result.ToString());
            Console.Read();
        }
    }
}