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

namespace 里氏替換原則
{
    /// <summary>
    /// 鳥類
    /// </summary>
    public class Bird
    {
        /// <summary>
        /// 吃的方法
        /// </summary>
        public void Eat()
        { }

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

    /// <summary>
    /// 定義一個(gè)企鵝類繼承鳥類
    /// </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 里氏替換原則
{
    /// <summary>
    /// 定義一個(gè)父類寵物類
    /// </summary>
    public  class Pet
    {
    }

    /// <summary>
    /// 定義一個(gè)企鵝類繼承自寵物類
    /// </summary>
    public class PenguinDemo : Pet
    {
        /// <summary>
        /// 游泳的方法
        /// </summary>
        public void Swiming()
        {
            Console.WriteLine("可愛企鵝在游泳");
        }
    }

    /// <summary>
    /// 定義一個(gè)海豚類繼承自寵物類
    /// </summary>
    public class Dolphin : Pet
    {
        /// <summary>
        /// 玩游戲的方法
        /// </summary>
        public void PlayGame()
        {
            Console.WriteLine("神奇泡泡打磚塊");
        }
    }

    /// <summary>
    /// 測(cè)試類
    /// </summary>
    public class Test
    {
        public static void ShowPlay(Pet pet)
        {
            if (pet is PenguinDemo)
            {
                //類型轉(zhuǎn)換
                PenguinDemo pen = (PenguinDemo)pet;
                pen.Swiming();
            }
            if (pet is Dolphin)
            {
                //類型轉(zhuǎn)換
                Dolphin dol = (Dolphin)pet;
                dol.PlayGame();
            }
        }
    }
}