C#设计模式-结构型模式-3.装饰者模式

Posted 2022-12-10 mr.chenyuelin

装饰者顾名思义就是对一个类添加一些额外的装饰（功能）

结构图：

具体装饰类concreteDecorate就是我们要添加的功能

例子，比如我们盖了一个房子，我们想要装修房子，更安全或者更好看

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 装饰者模式

    //房子抽象接口,component类型
    public abstract  class House
    
        //装修方法
        public abstract void Renovation();
    
    //装饰接口，Decorator
    public abstract class DecorationStrategy:House
    
        protected House house;

        protected DecorationStrategy(House house)
        
            this.house = house;
        
        //装修方法
        public override void Renovation()
        
            if(this.house!=null)
            
                this.house.Renovation();
            
        
    
    //具体装修的房子，concreteComponent
    public sealed class InitFamilyHouse : House
    
        public override void Renovation()
        
            Console.WriteLine("装修家里的房子");
        
    
    //具体安全功能，concreteDecorateA
    public sealed class HouseSecurityDecorator:DecorationStrategy
    
        public HouseSecurityDecorator(House house) : base(house)  
        public override void Renovation()
        
            base.Renovation();
            Console.WriteLine("增加安全系统");
        
    
    //具体保暖功能，concreteDecorateB
    public sealed class KeepWarmDecorator:DecorationStrategy
    
        public KeepWarmDecorator(House house) : base(house)  
        public override void Renovation()
        
            base.Renovation();
            Console.WriteLine("增加保暖系统");
        
    

    class Program
    
        static void Main(string[] args)
        
            House familyHouse = new InitFamilyHouse();

            DecorationStrategy securityHouse = new HouseSecurityDecorator(familyHouse);
            securityHouse.Renovation();

            DecorationStrategy keepWarmHose = new KeepWarmDecorator(familyHouse);
            keepWarmHose.Renovation();