Net设计模式实例之简单工厂模式(Simple Factory Patte
发布时间:2017-09-14 17:12:20
Net设计模式实例之简单工厂模式(Simple Factory Pattern)
一、简单工厂模式简介(Bref Introduction)
简单工厂模式(Simple Factory Pattern)的优点是,工厂类中包含了必要的逻辑判断,根据客户端的选择条件动态实例化相关的类,对于客户端来说,去除了与具体产品的依赖
二、解决的问题(What To Solve)客户实例化对象时不需要关心该对象是由哪个子类实例化的。
三、简单工厂模式分析(Analysis)1、简单工厂模式结构
IProduct接口:抽象产品类
ConcreteProduct类:产品类的具体实现
Simple Factory简单工厂类
四.实例分析(Example)1、场景
一个简单计算器,具有简单的加操作和减操作。结构如下图所示
SimpleFactory:简单工厂类。
Operation:抽象操作类
AddOperation:加法操作
SubOperation:减法操作
2、代码
1、抽象操作类Operation,及其具体实现类AddOperation、SubOperation
/// <summary> /// 抽象操作类 /// </summary> public abstract class Operation { public int numberA; public int numberB; public abstract int GetResult(); } /// <summary> /// 加法操作 /// </summary> public class AddOperation: Operation { public override int GetResult() { return (this.numberA + this.numberB); } } /// <summary> /// 减法操作 /// </summary> public class SubOperation: Operation { public override int GetResult() { return (this.numberA - this.numberB); } }2、简单工厂类SimpleFactory
/// <summary> /// 简单工厂类 /// </summary> public class SimpleFactory { public static Operation CreateOperation(string operation) { Operation o = null; switch (operation) { case "+": o = new AddOperation(); break; case "-": o = new SubOperation(); break; } return o; } }3、客户端代码
static void Main(string[] args) { Operation operation1 = SimpleFactory.CreateOperation("+"); operation1.numberA = 10; operation1.numberB = 20; Console.WriteLine("{0}+{1}={2}", operation1.numberA, operation1.numberB, operation1.GetResult()); Operation operation2 = SimpleFactory.CreateOperation("-"); operation2.numberA = 10; operation2.numberB = 20; Console.WriteLine("{0}-{1}={2}", operation2.numberA, operation2.numberB, operation2.GetResult()); Console.Read(); }3、实例运行结果
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