C#面向对象设计原则之里氏替换原则

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

namespace 里氏替换原则
{
    /// <summary>
    /// 鸟类
    /// </summary>
    public class Bird
    {
        /// <summary>
        /// 吃的方法
        /// </summary>
        public void Eat()
        { }

        /// <summary>
        /// 飞的方法
        /// </summary>
        public void Fly()
        { }
    }

    /// <summary>
    /// 定义一个企鹅类继承鸟类
    /// </summary>
    public class Penguin : Bird
    {

    }

    public class Test
    {
        public static void ShowFly(Bird bird)
        {
            bird.Fly();
        }

        public static void Main()
        {
            ShowFly(new Penguin());
        }
    }
}

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

namespace 里氏替换原则
{
    /// <summary>
    /// 定义一个父类宠物类
    /// </summary>
    public  class Pet
    {
    }

    /// <summary>
    /// 定义一个企鹅类继承自宠物类
    /// </summary>
    public class PenguinDemo : Pet
    {
        /// <summary>
        /// 游泳的方法
        /// </summary>
        public void Swiming()
        {
            Console.WriteLine("可爱企鹅在游泳");
        }
    }

    /// <summary>
    /// 定义一个海豚类继承自宠物类
    /// </summary>
    public class Dolphin : Pet
    {
        /// <summary>
        /// 玩游戏的方法
        /// </summary>
        public void PlayGame()
        {
            Console.WriteLine("神奇泡泡打砖块");
        }
    }

    /// <summary>
    /// 测试类
    /// </summary>
    public class Test
    {
        public static void ShowPlay(Pet pet)
        {
            if (pet is PenguinDemo)
            {
                //类型转换
                PenguinDemo pen = (PenguinDemo)pet;
                pen.Swiming();
            }
            if (pet is Dolphin)
            {
                //类型转换
                Dolphin dol = (Dolphin)pet;
                dol.PlayGame();
            }
        }
    }
}