using System; 
 
/**//// <summary> 
///售货员接口,所有类型的售货员必须实现该接口 
/// </summary> 
interface ISalesMan 
{ 
  string Name {set;get;} //售货员名字 
  void SetNext(ISalesMan nextSalesMan); //设置下一级售货员 
  void Process(Order order); //处理订单 
} 
 
/**//// <summary> 
/// 订单类 
/// </summary> 
class Order 
{ 
  private int orderAmount; 
 
  public int Amount 
  { 
    set{ this.orderAmount = value;} 
    get{ return this.orderAmount; } 
  } 
} 
 
/**//// <summary> 
/// 一类售货员 
/// </summary> 
class FirstSalesMan : ISalesMan 
{ 
  private ISalesMan nextSalesMan = null; 
  private string name = string.Empty; 
 
  ISalesMan 成员ISalesMan 成员 
} 
 
/**//// <summary> 
/// 二类售货员 
/// </summary> 
class SecondSalesMan : ISalesMan 
{ 
  private ISalesMan nextSalesMan = null; 
  private string name = string.Empty; 
 
  ISalesMan 成员ISalesMan 成员 
} 
 
/**//// <summary> 
/// 三类售货员 
/// </summary> 
class ThirdSalesMan : ISalesMan 
{ 
  private ISalesMan nextSalesMan = null; 
  private string name = string.Empty; 
 
  ISalesMan 成员ISalesMan 成员 
} 
 
class Client 
{ 
  public static void Main(string[] args) 
  { 
    FirstSalesMan first = new FirstSalesMan(); 
    first.Name = "firstMan"; 
 
    SecondSalesMan second = new SecondSalesMan(); 
    second.Name = "secondMan"; 
 
    ThirdSalesMan third = new ThirdSalesMan(); 
    third.Name = "thirdMan"; 
 
    first.SetNext(second); 
    second.SetNext(third); 
 
    Order o = new Order(); 
    o.Amount = 300; 
    first.Process(o); 
 
    o = new Order(); 
    o.Amount = 1300; 
    first.Process(o); 
 
    o = new Order(); 
    o.Amount = 11300; 
    first.Process(o); 
 
    Console.Read(); 
  } 
}