设计模式之工厂模式

namespace SimpleFactory.Caculation_bll
{
　　/// <summary>
　　/// 所有具体策略类的父类
　　/// </summary>
public class Operation
{
　　private double numberA;

public double NumberA
{
get { return numberA; }
set { numberA = value; }
}

private double numberB;

public double NumberB
{
get { return numberB; }
set { numberB = value; }
}

//所有具体策略类的共同方法
public virtual double GetResult()
{
double result = 0;
return result;
}
}
}