设计模式学习笔记--装饰模式

 1 using System;
 2
 3 namespace Decorator
 4 {
 5     /// <summary>
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/21 22:56:57
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Beverage说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址
10     /// </summary>
11     public abstract class Beverage
12     {
13         protected string description = "Unknown Beverage";
14
15         public virtual string GetDescription()
16         {
17             return description;
18         }
19
20         public abstract double Cost();
21     }
22 }

 1 using System;
 2
 3 namespace Decorator
 4 {
 5     /// <summary>
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/21 23:02:25
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Espresso说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址
10     /// </summary>
11     public class Espresso:Beverage
12     {
13         public Espresso()
14         {
15             description = "Espresso";
16         }
17
18         public override double Cost()
19         {
20             return 1.99;
21         }
22     }
23 }

 1 using System;
 2
 3 namespace Decorator
 4 {
 5     /// <summary>
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/21 23:00:21
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// CondimentDecorator说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址
10     /// </summary>
11     public abstract class CondimentDecorator:Beverage
12     {
13         private Beverage beverage;
14
15         public CondimentDecorator(Beverage beverage)
16         {
17             this.beverage = beverage;
18         }
19
20         public override string GetDescription()
21         {
22             return beverage.GetDescription();
23         }
24
25         public override double Cost()
26         {
27             return beverage.Cost();
28         }
29     }
30 }

 1 using System;
 2
 3 namespace Decorator
 4 {
 5     /// <summary>
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/21 23:07:18
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Mocha说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址
10     /// </summary>
11     public class Mocha : CondimentDecorator
12     {
13         public Mocha(Beverage beverage)
14             : base(beverage)
15         { }
16
17         public override string GetDescription()
18         {
19             return base.GetDescription() + "+ Mocha";
20         }
21
22         public override double Cost()
23         {
24             return base.Cost() + 0.20;
25         }
26     }
27 }

 1 using System;
 2
 3 namespace Decorator
 4 {
 5     /// <summary>
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/21 23:10:42
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Soy说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址
10     /// </summary>
11     public class Soy : CondimentDecorator
12     {
13         public Soy(Beverage beverage)
14             : base(beverage)
15         { }
16
17         public override string GetDescription()
18         {
19             return base.GetDescription() + "+ Soy";
20         }
21
22         public override double Cost()
23         {
24             return base.Cost() + 0.30;
25         }
26     }
27 }

 1 using System;
 2
 3 namespace Decorator
 4 {
 5     /// <summary>
 6     /// 作者：bzyzhang
 7     /// 时间：2016/5/21 23:13:05
 8     /// 博客地址：http://www.cnblogs.com/bzyzhang/
 9     /// Whip说明：本代码版权归bzyzhang所有，使用时必须带上bzyzhang博客地址
10     /// </summary>
11     public class Whip : CondimentDecorator
12     {
13         public Whip(Beverage beverage)
14             : base(beverage)
15         { }
16
17         public override string GetDescription()
18         {
19             return base.GetDescription() + "+ Whip";
20         }
21
22         public override double Cost()
23         {
24             return base.Cost() + 0.60;
25         }
26     }
27 }

 1 using System;
 2
 3 namespace Decorator
 4 {
 5     class Program
 6     {
 7         static void Main(string[] args)
 8         {
 9             Espresso beverage1 = new Espresso();
10             Mocha mocha = new Mocha(beverage1);
11             Soy soy = new Soy(mocha);
12             Whip whip = new Whip(soy);
13
14             Console.WriteLine(whip.GetDescription()+"  "+whip.Cost());
15         }
16     }
17 }