装饰器模式

拼搏现实的明天。 2021-09-16 23:56 343阅读 0赞

## 7.装饰器模式 ##

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![70 1][]

class Program
        {
            static void Main(string[] args)
            {
                Phone ap = new ApplePhone(); //新买了个苹果手机
                Decorator aps = new Sticker(ap); //准备贴膜组件
                aps.Print();
     
                Decorator apa = new Accessories(ap); //过了几天新增了挂件组件
                apa.Print();
     
                Sticker s = new Sticker(ap);       //准备贴膜组件
                Accessories a = new Accessories(s);//同时准备挂件
                a.Print(); 
            }
        }
        public abstract class Phone
        {
            public abstract void Print();
        }
        public class ApplePhone:Phone
        {
            public override void Print()
            {
                Console.WriteLine("我有一部苹果手机");
            }
        }
        public abstract class Decorator:Phone
        {
            private Phone p ;    //该装饰对象装饰到的Phone组件实体对象 
            public Decorator(Phone p)
            {
                this.p = p;
            }
            public override void Print()
            {
                if (this.p != null)
                {
                    p.Print();
                }
            }
        }
        public class Sticker:Decorator// 贴膜
        {
            public Sticker(Phone p) : base(p) { }
            public override void Print()
            {
                base.Print();
                AddSticker();
            }
            public void AddSticker()
            {
                Console.WriteLine("现在苹果手机有贴膜了");
            }
        }
        public class Accessories:Decorator// 手机挂件，即具体装饰者
        {
            public Accessories(Phone p) : base(p) { }
            public override void Print()
            {
                base.Print();
                AddAccessories();
            }
            public void AddAccessories()
            {
                Console.WriteLine("现在苹果手机有漂亮的挂件了");
            }
        }

![70 2][]

[70]: /images/20210725/d4ca97942c6c475eaafe17699ae634ef.png
[70 1]: /images/20210725/2ccfb4dc1911420d97db1bdbfe4634ed.png
[70 2]: /images/20210725/9537e2dbc08f4356b332c5710decfad0.png