简单工厂初步了解

刺骨的言语ヽ痛彻心扉 2023-06-27 08:42 18阅读 0赞

// 运算基础类
        public class Operation
        {
            private double _numberA = 0;
            private double _numberB = 0;
    
            public double NumberA
            {
                get {return _numberA;}
                set {_numberA = value;}
    
            }
    
            public double NumberB
            {
                get{return _numberB;}
                set{_numberB = value;}
            }
    
            public virtual double GetResult()
            {
                double resulet = 0;
                return resulet;
            }
        }
     
        // 加法
        class OperationAdd:Operation
        {
            public override double GetResult()
            {
                double reasult = 0;
                reasult = NumberA + NumberB;
                return reasult;
            }
        }
       // 减法
        class OperationSub:Operation
        {
            public override double GetResult()
            {
                double reasult = 0;
                reasult = NumberA - NumberB;
     	        return reasult;
            }
        }
    
        // 简单工厂模式，管理算法类
        public class OperationFactory
        {
            public static Operation CreateOperate(string operate)
            {
                Operation opr = null;
                switch(operate)
                {
                    case "+":
                        opr = new OperationAdd();
                        break;
                    case "-":
                        opr = new OperationSub();
                        break;
                }
                return opr;
            }
        }
        class Program
        {
            static void Main(string[] args)
            {
                Operation oper;
                oper = OperationFactory.CreateOperate("+");
                oper.NumberA = 2;
                oper.NumberB = 3;
                double reasult = oper.GetResult();
    
                Console.WriteLine(reasult);
                Console.ReadKey();
            }
        }

学习一点点的程杰<大话设计模式>，让自己对写代码有新的认识，决定要花功夫好好钻研钻研。没看简单工厂模式之前，可能只是简单粗暴的把功能实现了，但是代码的维护性来说，确实增加了很多麻烦。而增加了一个工厂管理类 OperationFactory，后面添加新的运算方法，也就是增加一个新的类和在工厂管理类中增加相应的运算符号，而不必修改其他的代码。

参考：程杰<大话设计模式>