标签：tor out ice nbsp 代码 ble scribe 例子 size
四人组之装饰者模式。
1、例子：饮料和调料包之间的计价功能等实现。
2.实质上：相同接口，实现功能的不断扩充。
3.优美的一句话：“代码应如晚霞中池中莲花一样关闭（免于改变），又如晨曦中此花一样绽放（功能扩展）”。不修改代码的情况下进行扩展
4.实质上：装饰者可以在被装饰者行为之前(后)加上自己的行为，
为什么装饰者和被装饰者继承同一个baseclass ？
为了和被装饰者在类型匹配的基础上达到新的行为
实现：
1 static void Main(string[] args) 2 { 3 Coffee myCoffee = new Coffee(10);//一个被装饰者对象 4 5 DecoratorBase myDecorate = new DecoratorSugar(myCoffee, 0.1);//创建装饰者 6 myDecorate = new DecoratorSugar(myDecorate, 0.1);//双糖 7 myDecorate = new DecoratorMilk(myDecorate, 0.3); 8 9 Console.WriteLine("price:" + myDecorate.GetCost()); 10 Console.WriteLine("describe:" + myDecorate.GetDescribe()); 11 } 12 13 /// <summary> 14 /// 饮料相关基类：装饰者和被装饰者 15 /// </summary> 16 class Drink 17 { 18 protected string mDescribe = string.Empty; 19 protected double mCost = 0.0; 20 21 public Drink() 22 { 23 mDescribe = "--BaseDrink--"; 24 } 25 26 public virtual string GetDescribe() 27 { 28 return mDescribe; 29 } 30 public virtual double GetCost() 31 { 32 return mCost; 33 } 34 } 35 36 /// <summary> 37 /// 被装饰者：咖啡 38 /// </summary> 39 class Coffee : Drink 40 { 41 public Coffee(double price) 42 { 43 mDescribe = "--Coffee--"; 44 mCost = price; 45 } 46 } 47 /// <summary> 48 /// 被装饰者：果汁 49 /// </summary> 50 class Juice : Drink 51 { 52 public Juice(double price) 53 { 54 mCost = price; 55 } 56 } 57 58 /// <summary> 59 /// 装饰者 60 /// </summary> 61 class DecoratorBase : Drink 62 { 63 protected Drink mDrink = null; 64 65 public DecoratorBase(Drink drink, double price) 66 { 67 mDrink = drink; 68 69 mCost = price; 70 mDescribe = "--decorate--"; 71 } 72 } 73 74 class DecoratorSugar : DecoratorBase 75 { 76 public DecoratorSugar(Drink drink, double price) 77 : base(drink, price) 78 { 79 mDescribe = "--sugar--"; 80 } 81 82 public override string GetDescribe() 83 { 84 return mDescribe + mDrink.GetDescribe(); 85 } 86 87 public override double GetCost() 88 { 89 return mCost + mDrink.GetCost(); 90 } 91 92 } 93 94 class DecoratorMilk : DecoratorBase 95 { 96 public DecoratorMilk(Drink drink, double price) 97 : base(drink, price) 98 { 99 mDescribe = "--Milk--"; 100 } 101 public override string GetDescribe() 102 { 103 return mDescribe + mDrink.GetDescribe(); 104 } 105 106 public override double GetCost() 107 { 108 return mCost + mDrink.GetCost(); 109 } 110 }
结果：
添加功能：我们需要给每个饮料设置 小、中、大杯和不同价格，对应的调料包的需要小中大和不同价格。
调料的大中小不是自己决定的，而是由饮料决定的。
1 static void Main(string[] args) 2 { 3 Coffee myCoffee = new Coffee(10, SizeType.Min);//一个被装饰者对象 4 5 DecoratorBase myDecorate = new DecoratorSugar(myCoffee, 0.1);//创建装饰者 6 myDecorate = new DecoratorSugar(myDecorate, 0.1);//双糖 7 myDecorate = new DecoratorMilk(myDecorate, 0.3); 8 9 Console.WriteLine("price:" + myDecorate.GetCost()); 10 Console.WriteLine("describe:" + myDecorate.GetDescribe()); 11 } 12 13 enum SizeType 14 { 15 Max = 1, 16 Mid = 2, 17 Min = 3, 18 } 19 20 public static double[] percentPrice = { 1, 0.8, 0.5 };//每个调料包size价格百分比 21 22 /// <summary> 23 /// 饮料相关基类：装饰者和被装饰者 24 /// </summary> 25 class Drink 26 { 27 protected string mDescribe = string.Empty; 28 protected double mCost = 0.0; 29 protected SizeType mSizeType = SizeType.Max; 30 31 public Drink() 32 { 33 mDescribe = "--BaseDrink--"; 34 } 35 36 public virtual string GetDescribe() 37 { 38 return mDescribe; 39 } 40 public virtual double GetCost() 41 { 42 return mCost; 43 } 44 45 public SizeType GetSize() 46 { 47 return mSizeType; 48 } 49 } 50 51 /// <summary> 52 /// 被装饰者：咖啡 53 /// </summary> 54 class Coffee : Drink 55 { 56 public Coffee(double price, SizeType sizeType) 57 { 58 mDescribe = "--Coffee--"; 59 mCost = price; 60 mSizeType = sizeType; 61 } 62 } 63 /// <summary> 64 /// 被装饰者：果汁 65 /// </summary> 66 class Juice : Drink 67 { 68 public Juice(double price, SizeType sizeType) 69 { 70 mDescribe = "--Juice--"; 71 mCost = price; 72 mSizeType = sizeType; 73 } 74 } 75 76 /// <summary> 77 /// 装饰者 78 /// </summary> 79 class DecoratorBase : Drink 80 { 81 protected Drink mDrink = null; 82 83 public DecoratorBase(Drink drink, double price) 84 { 85 if (drink != null) 86 { 87 mDrink = drink; 88 89 mCost = price; 90 mDescribe = "--decorate--"; 91 92 mSizeType = mDrink.GetSize(); 93 } 94 } 95 } 96 97 class DecoratorSugar : DecoratorBase 98 { 99 public DecoratorSugar(Drink drink, double price) 100 : base(drink, price) 101 { 102 mDescribe = "--sugar--"; 103 } 104 105 public override string GetDescribe() 106 { 107 return mDescribe + mDrink.GetDescribe(); 108 } 109 110 public override double GetCost() 111 { 112 double percent = percentPrice[(int)mSizeType - 1]; 113 return mCost * percent + mDrink.GetCost(); 114 } 115 116 } 117 118 class DecoratorMilk : DecoratorBase 119 { 120 public DecoratorMilk(Drink drink, double price) 121 : base(drink, price) 122 { 123 mDescribe = "--Milk--"; 124 } 125 public override string GetDescribe() 126 { 127 return mDescribe + mDrink.GetDescribe(); 128 } 129 130 public override double GetCost() 131 { 132 double percent = percentPrice[(int)mSizeType - 1]; 133 return mCost * percent + mDrink.GetCost(); 134 } 135 }
标签：tor out ice nbsp 代码 ble scribe 例子 size
原文地址：http://www.cnblogs.com/sun-shadow/p/6238363.html
