概述
装饰者模式也是一种结构类型的设计模式，它可以在不改变原有结构的情况下为对象添加新的功能，和组合模式有类似的地方，满足开闭原则。主要组成部分有，装饰者，装饰者接口，装饰功能，然后就可以根据对应的需求，用装饰功能装饰装饰者。
需求：需要为三个小朋友装饰服饰，小明需要衣服，小张需要衣服和帽子，小红需要衣服，帽子和鞋子。
装饰者模式
internal class Program
{private static void Main(string[] args){IDecorator XiaoMing = new Person("小明:");IDecorator cloth = new Clothing(XiaoMing);Console.WriteLine(cloth.Dicoration());IDecorator XiaoZhang = new Person("小张:");IDecorator CH = new Clothing(new Hat(XiaoZhang));Console.WriteLine(CH.Dicoration());IDecorator XiaoHong = new Person("小红:");IDecorator CHS = new Clothing(new Hat(new Shoe(XiaoHong)));Console.WriteLine(CHS.Dicoration());}public interface IDecorator//装饰者接口{string Dicoration();}public class Person : IDecorator//人{private readonly string _Name;public Person(string name){_Name = name;}public string Dicoration(){return _Name;}}public abstract class PersonDecorator : IDecorator//装饰者抽象类{protected IDecorator _Decorator;public PersonDecorator(IDecorator decorator){_Decorator = decorator;}public abstract string Dicoration();}public class Clothing : PersonDecorator//衣服{public Clothing(IDecorator decorator) : base(decorator) { }public override string Dicoration(){return _Decorator.Dicoration()+" 衣服";}}public class Hat : PersonDecorator//帽子{public Hat(IDecorator decorator) : base(decorator) { }public override string Dicoration(){return _Decorator.Dicoration()+" 帽子";}}public class Shoe : PersonDecorator//鞋子{public Shoe(IDecorator decorator) : base(decorator) { }public override string Dicoration(){return _Decorator.Dicoration() + " 鞋子";}}
}输出
小明: 衣服
小张: 帽子 衣服
小红: 鞋子 帽子 衣服