设计模式之(策略模式)(C#实现)(程杰)

abstract class CashSuper //定义一个抽象类

{

public abstract double acceptCash(double money);

}

class  CashRebate:CashSuper

{

private double moneyRebate=0.0d;

public CashRebate(string moneyRebate)

{

this.moneyRebate=double.Parse(moneyRebate);//把几折数据保存到对象字段中

}//实现父类方法

public override double acceptCash(double money)  //参数是价钱

{

return money*moneyRebate;

}

}

 

//正常收费的子类

class CashNormal:CashSuper

{

public override double acceptCash(double money)

{

return money;

} 

}

class CashReturn:CahSuper

{

private double moneyCondition=0.0d;

private double moneyReturn=0.0d;

public CashReturn(string moneyCondition,string moneyReturn)

{

this.moneyCondition=moneyCondition;

this.moneyReturn=moneyReturn;

}

public override double acceptCash(double money)

{

double result=money;

if(money>moneyCondition)

{

result=money-Math.Floor(money/moneyCondition)*moneyReturn;

}

return result;

}

}

 

//策略类

class Context

{

private CashSuper cash;

public Context(CashSuper cash)

{

this.cash=cash;

}

public double acceptCash(double money)

{

cash.acceptCash(money)

}

}

 

客户端进行调用：//应用了某一种策略

Context context=null;

context=new Context(new CashReturn(a.Text,b.Text));

context.acceptCash(c.Text);

 

策略模式的附图以后：