五.策略模式

策略模式：

       与工厂不同的是，工厂是：

              工厂类接受参数，实例化具体的类，返回类

       策略模式是：

 

接受具体的实例化类，仅将方法赋予策略类

 

策略模式类：

class CashContext

    {

       private CashSuper cs;

       public CashContext(CashSuper csuper)

       {

           this.cs = csuper;

       }

       public double GetResult(double monty)

       {

           return cs.acceptCash(monty);

       }

    }

抽象类和实现类：

abstract class CashSuper

    {

       public abstract double acceptCash(double money);

    }

   //正常收费

   class CashNormal : CashSuper

    {

       public override double acceptCash(double money)

       {

           return money;

       }

    }

   //打折收费类

   class CashRebhate : CashSuper

    {

       private double moneyRebate = 1d;

       public CashRebhate(string moneyRebate)

       {

           this.moneyRebate = double.Parse(moneyRebate );

       }

       public override double acceptCash(double money)

       {

           return money * moneyRebate;

       }

}

调用策略模式：

private voidbutton1_Click(object sender, EventArgs e)

        {

            CashContext cc =null;

            switch (comboBox1.Text)

            {

                case "正常收费":

                    cc= new CashContext(new CashNormal());

                    break;

                。。。。。。。。

            }

            double totals =Convert.ToDouble(textBox1.Text) * Convert.ToDouble(textBox2.Text);

            totals =cc.GetResult(totals);