设计模式学习--装饰者模式(Decorator Pattern)

    /// <summary>
    /// 装饰者模式模型,接口
    /// </summary>
    public interface IDecorator
    {
        string Name { get; }
        int Sum { get; }
        void Add(IDecorator decorator);
    }

    /// <summary>
    /// 装饰者类
    /// </summary>
    public class CDecorator:IDecorator
    {
        private string myName;

        private int mySum;

        private ArrayList myDecorator;

        public CDecorator()
        {
            myName = "";
            mySum = 0;
            myDecorator = new ArrayList();
        }

        //只读属性,名称
        public string Name
        {
            get
            {
                string result = myName;
                foreach (IDecorator d in myDecorator)
                {
                    result += ", " + d.Name;
                }
                return myName;
            }
        }

        //只读属性,合计值
        public int Sum
        {
            get
            {
                int result = mySum;
                foreach (IDecorator d in myDecorator)
                {
                    result += d.Sum;
                }
                return mySum;
            }
        }

        //添加装饰者对象
        public void Add(IDecorator decorator)
        {
            myDecorator.Add(decorator);
        }
    }

    //应用测试
    class Program
    {
        static void Main(string[] args)
        {
            CDecorator decoratorA = new CDecorator("decoratorA", 1);
            CDecorator decoratorB = new CDecorator("decoratorB", 2);
            CDecorator decoratorC = new CDecorator("decoratorC", 3);
            
            decoratorA.Add(decoratorB);
            decoratorA.Add(decoratorC);

            Console.WriteLine(decoratorA.Name);
            Console.WriteLine(decoratorA.Sum);

            Console.Read();
        }
    }