建造者模式(Builder Pattern)

为了应对复杂对象的创建，其通常由各个部分的子对象用一定的算法构成；由于需求的变化，这个复杂对象的各个部分经常面临着剧烈的变化，但是将它们组合在一起的算法确相对稳定。

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122

using System; using System.Collections; using System.Reflection;   namespace DapperTest.Models {     // Food类，即产品类     public class Food     {         Hashtable food = new Hashtable();         // 添加食品         public void Add(string strName, string Price)         {             food.Add(strName, Price);         }           // 显示食品清单         public void Show()         {             IDictionaryEnumerator myEnumerator = food.GetEnumerator();             Console.WriteLine("Food List:");             Console.WriteLine("------------------------------");             string strfoodlist = "";             while (myEnumerator.MoveNext())             {                 strfoodlist = strfoodlist + "\n\n" + myEnumerator.Key.ToString();                 strfoodlist = strfoodlist + ":\t" + myEnumerator.Value.ToString();             }             Console.WriteLine(strfoodlist);             Console.WriteLine("\n------------------------------");         }     }     // FoodManager类，即指导者     public class FoodManager     {         public void Construct(Builder builder)         {             builder.BuildHamb();             builder.BuildCoke();             builder.BuildChip();         }     }     // Builder类，即抽象建造者类，构造套餐     public abstract class Builder     {         // 添加汉堡         public abstract void BuildHamb();           // 添加可乐         public abstract void BuildCoke();           // 添加薯条         public abstract void BuildChip();           // 返回结果 食品对象         public abstract Food GetFood();     }     // NormalBuilder类，具体构造者，普通套餐     public class NormalBuilder : Builder     {         private Food NormalFood = new Food();         public override void BuildHamb()         {             NormalFood.Add("NormalHamb", "￥10.00");         }         public override void BuildCoke()         {             NormalFood.Add("CokeCole", "￥4.50");         }         public override void BuildChip()         {             NormalFood.Add("FireChips", "￥2.00");         }         public override Food GetFood()         {             return NormalFood;         }     }     // GoldBuilder类，具体构造者，黄金套餐     public class GoldBuilder : Builder     {         private Food GoldFood = new Food();         public override void BuildHamb()         {             GoldFood.Add("GoldHamb", "￥25.00");         }         public override void BuildCoke()         {             GoldFood.Add("CokeCole", "￥4.50");         }         public override void BuildChip()         {             GoldFood.Add("FireChips", "￥3.50");         }         public override Food GetFood()         {             return GoldFood;         }     }     //调用     public class BuilderPattern     {         public static void BuildTest()         {             FoodManager foodmanager = new FoodManager();             Console.WriteLine("Please Enter Food No:");             string foodType = Console.ReadLine();             if (foodType == "1")             {                 foodType = "NormalBuilder";             }             if (foodType == "2")             {                 foodType = "GoldBuilder";             }             Builder instance = (Builder)Assembly.Load("DapperTest").CreateInstance("DapperTest.Models." + foodType);             foodmanager.Construct(instance);             Food food = instance.GetFood();             food.Show();         }     } }