装饰器模式

    /// <summary>
    /// 抽象类 
    /// </summary>
    public abstract class Animal
    {
        public abstract void Show();
    }

    public class Dog : Animal
    {
        public override void Show()
        {
            Console.WriteLine("我是狗");
        }
    }

 /// <summary>
    /// 装饰器吃的

  /// <summary>
    /// 装饰器爱好
    /// </summary>
    public class HobbyDecorator : Animal
    {
        private Animal _animal = null;
        public HobbyDecorator(Animal animal)
        {

     static void Main(string[] args)
        {
            ///装饰器添加属性
            Animal dog = new Dog();
            dog = new HobbyDecorator(dog);
            dog = new EatDecorator(dog);
            dog.Show();
            Console.ReadKey();
        }

this._animal = animal;
        }
        public override void Show()
        {
            //调用父类的方法
            this._animal.Show();
            Console.WriteLine("比较喜欢吃屎");

        }
    }

方法
    /// </summary>
    public class EatDecorator : Animal
    {
        public Animal _animal = null;
        public EatDecorator(Animal animal)
        {
            _animal = animal;
        }
        public override void Show()
        {
            _animal.Show();
            Console.WriteLine("喜欢吃骨头");
        }
    }