桥接模式 c#

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

namespace ConsoleApplication1
{
    class Program
    {

        public abstract class Color
        {
            public string col;

        }

        public class RedColor : Color
        {
            public RedColor()
            {
                col = "red";
            }
        }

        public class BlueColor : Color
        {
            public BlueColor()
            {
                col = "blue";
            }
        }

        public abstract class Car
        {
            private Color color;

            public Color Color
            {
                get { return color; }
                set { color = value; }
            }

            public abstract void Show();
        }

        public class BigCar : Car
        {
            public override void Show()
            {
                Console.WriteLine("big car " + Color.col);
            }
        }

        public class SmallCar : Car
        {
            public override void Show()
            {
                Console.WriteLine("small car " + Color.col);
            }
        }

        static void Main(string[] args)
        {
            Car car = new BigCar();
            car.Color = new BlueColor();
            car.Show();

            car = new SmallCar();
            car.Color = new RedColor();
            car.Show();

        }
    }
}