设计模式学习笔记--装饰模式

using System;

namespace Decorator
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/21 22:56:57 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Beverage说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public abstract class Beverage
    {
        protected string description = "Unknown Beverage";

        public virtual string GetDescription()
        {
            return description;
        }

        public abstract double Cost();
    }
}

using System;

namespace Decorator
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/21 23:02:25 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Espresso说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Espresso:Beverage
    {
        public Espresso()
        {
            description = "Espresso";
        }

        public override double Cost()
        {
            return 1.99;
        }
    }
}

using System;

namespace Decorator
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/21 23:00:21 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// CondimentDecorator说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public abstract class CondimentDecorator:Beverage
    {
        private Beverage beverage;

        public CondimentDecorator(Beverage beverage)
        {
            this.beverage = beverage;
        }

        public override string GetDescription()
        {
            return beverage.GetDescription();
        }

        public override double Cost()
        {
            return beverage.Cost();
        }
    }
}

using System;

namespace Decorator
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/21 23:07:18 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Mocha说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Mocha : CondimentDecorator
    {
        public Mocha(Beverage beverage)
            : base(beverage)
        { }

        public override string GetDescription()
        {
            return base.GetDescription() + "+ Mocha";
        }

        public override double Cost()
        {
            return base.Cost() + 0.20;
        }
    }
}

using System;

namespace Decorator
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/21 23:10:42 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Soy说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Soy : CondimentDecorator
    {
        public Soy(Beverage beverage)
            : base(beverage)
        { }

        public override string GetDescription()
        {
            return base.GetDescription() + "+ Soy";
        }

        public override double Cost()
        {
            return base.Cost() + 0.30;
        }
    }
}

using System;

namespace Decorator
{
    /// <summary> 
    /// 作者：bzyzhang
    /// 时间：2016/5/21 23:13:05 
    /// 博客地址：http://www.cnblogs.com/bzyzhang/
    /// Whip说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址 
    /// </summary> 
    public class Whip : CondimentDecorator
    {
        public Whip(Beverage beverage)
            : base(beverage)
        { }

        public override string GetDescription()
        {
            return base.GetDescription() + "+ Whip";
        }

        public override double Cost()
        {        
            return base.Cost() + 0.60;
        }
    }
}

using System;

namespace Decorator
{
    class Program
    {
        static void Main(string[] args)
        {
            Espresso beverage1 = new Espresso();
            Mocha mocha = new Mocha(beverage1);
            Soy soy = new Soy(mocha);
            Whip whip = new Whip(soy);

            Console.WriteLine(whip.GetDescription()+"  "+whip.Cost());
        }
    }
}