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

namespace DesignMode
{
   public class BridgeParth
    {
        public void Initiale() {  }
        private Animal _animal;
        public Animal CurAnimal
        {
            get { return _animal; }
            set { _animal = value; }
        }

        public virtual void Age() { _animal.Age(); }
        public virtual void Weight() { _animal.Weight(); }
        public virtual void SerialNum() { _animal.SerialNum(); }

    }


    /// <summary>
    /// 动物的抽象类
    /// </summary>
    public abstract class Animal
    {
        public abstract void Age();
        public abstract void Weight();
        public abstract void SerialNum();
    }

    public class Crow : Animal
    {
        public override void Age()
        {
            Console.WriteLine("Crow Age");
        }

        public override void SerialNum()
        {
            Console.WriteLine("Crow SerialNum");
        }

        public override void Weight()
        {
            Console.WriteLine("Crow Weight");
        }
    }

    public class Fish : Animal
    {
        public override void Age()
        {
            Console.WriteLine("Fish Age");
        }

        public override void SerialNum()
        {
            Console.WriteLine("Fish SerialNum");
        }

        public override void Weight()
        {
            Console.WriteLine("Fish Weight");
        }
    }
}


        static void Main(string[] args)
        {

            BridgeParth bridgeParth = new BridgeParth();
            Crow crow = new Crow();
            Fish fish = new Fish();
            bridgeParth.CurAnimal = crow;
            bridgeParth.Age();
            bridgeParth.SerialNum();
            bridgeParth.Weight();
            bridgeParth.CurAnimal = fish;
            bridgeParth.Age();
            bridgeParth.SerialNum();
            bridgeParth.Weight();
            Console.Read();

        }