设计模式--工厂模式

 

 

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

namespace ConsoleApplication1
{
    class Client
    {
        public static void Main()
        {
            IFactory i = new AddFactory();
            Math oper = i.CreateOperation();
            oper.A = 5;
            oper.B = 10;
            Console.WriteLine(oper.DoTheMath ());

            i = new SubFactory();
            oper = i.CreateOperation();
            oper.A = 10;
            oper.B = 3;
            Console.WriteLine(oper.DoTheMath());

            Console.Read();

        }
    }

    class Math
    {
        double _a;
        double _b;

        public double A
        {
            set { _a = value;}
            get { return _a; }
        }

        public double B
        {
            set { _b = value; }
            get { return _b; }
        }

        public virtual double DoTheMath()
        {
            return 0;
        }
       
    }

    class Add:Math
    {
        public override double DoTheMath()
        {
            return A + B;
        }
    }

    class Sub : Math
    {
        public override double DoTheMath()
        {
            return A - B;
        }
    }

    interface IFactory
    {
        Math CreateOperation();
    }

    class AddFactory : IFactory
    {
        public Math CreateOperation()
        {
            return new Add();
        }
    }

    class SubFactory : IFactory
    {
        public Math CreateOperation()
        {
            return new Sub();
        }
    }
}