简单的工厂模式

所有的代码都是根据大话设计模式而来的

在没有看设计模式的时候

要我做下面的题目

简易计算器代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Console.WriteLine("请输入第一个数");
                double a = double.Parse(Console.ReadLine());
                Console.WriteLine("请输入您想要运算的符号！");
                string Opreation = Console.ReadLine();
                Console.WriteLine("请输入第二个数");
                double b = double.Parse(Console.ReadLine());
                Console.WriteLine("运算后的结果为：{0}", GetResults(a, Opreation, b));
            }
            catch (Exception ex)
            {
                Console.WriteLine("输入信息由错误:{0}", ex.Message);
            }

        }
        public static double GetResults(double Pre, string Opreation, double Next)
        {
            double Results = 0;
            switch (Opreation)
            {
                case "+":
                    Results = Pre + Next;
                    break;
                case "-":
                    Results = Pre - Next;
                    break;
                case "*":
                    Results = Pre * Next;
                    break;
                case "/":
                    if (Next == 0)
                    {
                        Console.WriteLine("被除数不能为0");
                    }
                    else
                    {
                        Results = Pre / Next;
                    }
                    break;
                default:
                    Results = -1;
                    break;
            }
            return Results;
        }
    }
    
}

看我工厂模式之后代码如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Opreation
    {
        private double _Number1;
        public double Number1
        {
            set { _Number1 = value; }
            get { return _Number1; }
        }
        private double _Number2;
        public double Number2
        {
            set { _Number2 = value; }
            get { return _Number2; }
        }
        public virtual double GetResult(double N1,double N2)
        { 
            double Results=N1+N2;
            return Results;
        }
       
    }
    //加法
    class OpreationPlus : Opreation
    {
        public override double GetResult(double N1, double N2)
        {
            return base.GetResult(N1, N2);
        }
    }
    //减法
    class OpreationMinus : Opreation
    {
        double Minus = 0;
        public override double GetResult(double N1, double N2)
        {
            Minus = N1 - N2;
            return Minus;
        }
       
    }
    //乘法
    class OpreationMultiply : Opreation
    {
        double Multiply = 0;
        public override double GetResult(double N1, double N2)
        {
            Multiply = N1 * N2;
            return Multiply;
        } 
    }
    //除法 
    class OprationDivide : Opreation
    {
        double Divide = 0;
        public override double GetResult(double N1, double N2)
        {
            if (N2 == 0)
            {
                Console.WriteLine("被除数不能为0~~");
            }
            else
            {
                Divide = N1 / N2;
            }
            return Divide;
        }
    }
    //工厂类
    class Factory
    {
        //根据不同的操作类型生产不同的实例
        public static Opreation FactoryOpreation(string Method)
        {
            Opreation Opreation = null;
            switch (Method)
            { 
                case "+":
                    Opreation = new OpreationPlus();
                    break;
                case "-":
                    Opreation = new OpreationMinus();
                    break;
                case "*":
                    Opreation = new OpreationMultiply();
                    break;
                case "/":
                    Opreation = new OprationDivide();
                    break;
                default:
                    break;
            }
            return Opreation;
        }
    }
    class Result
    { 
       static void Main()
        {
          
            Console.WriteLine("请输入第一个数字");
            double Number1 = double.Parse(Console.ReadLine());
            Console.WriteLine("请输入您想要运算的符号！");
            string Opreation = Console.ReadLine();
            Opreation Produce = Factory.FactoryOpreation(Opreation);
            Console.WriteLine("请输入第二个数字");
            double Number2 = double.Parse(Console.ReadLine());
            Console.WriteLine("预算后的结果是:{0}", Produce.GetResult(Number1, Number2));
        }
    }
}