Asp.Net 设计模式 之 “工厂方法”即利用 接口 实现的抽象工厂

 ?1 using System; ?2 using System.Collections.Generic; ?3 using System.Linq; ?4 using System.Text; ?5 using System.Threading.Tasks; ?6 ??7 namespace FactoryModel ?8 { ?9 ????//====================使用C#，利用简单工厂模式，实现简单的计算器功能==================== 10 ????//考察时知识点：面向对象三大特性——继承、封装、多态 11 ????/// <summary> 12 ????/// 1.定义父类，同时也是一个封装 13 ????/// </summary> 14 ????class Operation 15 ????{ 16 ????????//2.因为要让子类能够对父类进行访问，故应要将参数定义为受保护的变量类型 17 ????????protected int numberA; 18 ????????protected int numberB; 19 ????????//定义属性（必写） 20 ????????public int NumberA 21 ????????{ 22 ????????????get { return numberA; } 23 ????????????set { numberA = value; } 24 ????????} 25 ????????public int NumberB 26 ????????{ 27 ????????????get { return numberB; } 28 ????????????set { numberB = value; } 29 ????????} 30 ????????//3.封装虚方法，以供子类进行重写 31 ????????public virtual int getResule() 32 ????????{ 33 ????????????int result = 0; 34 ????????????return result; 35 ????????} 36 ????} 37 ????/// <summary> 38 ????/// 4.定义子类,继承父类，并对父类进行重写(加法) 39 ????/// </summary> 40 ????class OperationAdd : Operation 41 ????{ 42 ????????public override int getResule() 43 ????????{ 44 ????????????return numberA + numberB; 45 ????????} 46 ????} 47 ????/// <summary> 48 ????/// 5.定义子类,继承父类，并对父类进行重写（减法） 49 ????/// </summary> 50 ????class OperationSub : Operation 51 ????{ 52 ????????public override int getResule() 53 ????????{ 54 ????????????return numberA - numberB; 55 ????????} 56 ????} 57 ????/// <summary> 58 ????/// 6.创建工厂方法模式(抽象工厂：接口) 59 ????/// </summary> 60 ????interface IFactory ???//父接口（父类工厂） 61 ????{ 62 ????????/// <summary> 63 ????????/// 此父接口提供一个无参的函数方法 64 ????????/// </summary> 65 ????????/// <returns></returns> 66 ????????Operation CreateOperation(); 67 ????} 68 ????/// <summary> 69 ????/// 定义子类工厂，并继承父类工厂（父接口） 70 ????/// </summary> 71 ????class FactoryAdd : IFactory 72 ????{ 73 ????????/// <summary> 74 ????????/// 封装与父类工厂同名函数（返回值类型亦相同） 75 ????????/// </summary> 76 ????????/// <returns></returns> 77 ????????public Operation CreateOperation() 78 ????????{ 79 ????????????//返回上面OperationAdd子类 80 ????????????return new OperationAdd(); 81 ????????} 82 ????} 83 ????/// <summary> 84 ????/// 定义子类工厂，并继承父类工厂（父接口） 85 ????/// </summary> 86 ????class FactorySub : IFactory 87 ????{ 88 ????????/// <summary> 89 ????????/// 封装与父类工厂同名函数（返回值类型亦相同） 90 ????????/// </summary> 91 ????????/// <returns></returns> 92 ????????public Operation CreateOperation() 93 ????????{ 94 ????????????////返回上面OperationAdd子类 95 ????????????return new OperationSub(); 96 ????????} 97 ????} 98 ????//7.主函数中进行调用 99 ????class Program100 ????{101 ????????static void Main(string[] args)102 ????????{103 ????????????//进行加法运算,指定相应的工厂类型即可，无须再次输入运算类型104 ????????????IFactory i = new FactorySub();105 ????????????//进行减法运算106 ????????????//IFactory ii = new FactorySub(); ?107 ????????????Operation op = i.CreateOperation();108 ????????????op.NumberA = 10;109 ????????????op.NumberB = 30;110 ????????????//调用子类中的方法来获取结果111 ????????????int result = op.getResule();112 ????????????Console.WriteLine(result); ????????????????113 ????????????Console.ReadKey();114 ????????}115 ????????//如果在后续的编程中仍需要有其他的运算，则只需要在子类中加上相应的子类，116 ????????//并在工厂方法中中加上相应的工厂类即可即可，无须需改代码，这也就是工厂方法（抽象工厂）的“利”所在117 ????}118 }