在父类中定义一系列的抽象行为，具体的实现交由子类去实现，类似于ppt的模版，具体实现总是由我们自己去书写ppt。

using System;using System.Collections;using System.Collections.Generic;using System.Linq;namespace ConsoleApplication1{    class Program    {        public abstract class Dish        {            public void Cook()            {                StrikeFire();                PutOil();                PutSoil();                PutFood();                TurnOffFire();            }            public void StrikeFire()            {                Console.WriteLine("strike fire");            }            public void PutOil()            {                Console.WriteLine("put oil");            }            public void PutSoil()            {                Console.WriteLine("put soil");            }            /// 
            /// 具体放什么交由子类去完成            /// 
            public abstract void PutFood();                        public void TurnOffFire()            {                Console.WriteLine("turn off fire");            }        }        public class Meat : Dish        {            public override void PutFood()            {                Console.WriteLine("put meat");            }        }        static void Main(string[] args)        {            Meat meat = new Meat();            meat.Cook();        }    }}