/// <summary>
/// 简单工厂构造函数（这里是简单策略模式和简单工厂模式结合的关键点）
/// </summary>
/// <param name="rebateType">商场促销类型</param>
public CashContext(string rebateType)
{
switch (rebateType)
{
case "不打折":
this.cs = new CashNormal();
break;
case "打八折":
this.cs = new CashRebate(0.8);
break;
case "满三百送一百":
this.cs = new CashReturn(300, 100);
break;
}
}
/// <summary>
/// 普通构造函数
/// </summary>
/// <param name="cs">商场促销实例对象</param>
public CashContext(CashSuper cs)
{
this.cs = cs;
}