领域模型

///   <summary>
     ///  商品
     ///   </summary>
     public   class  Goods
    {
         ///   <summary>
         ///  对象标识
         ///   </summary>
         public  Guid OKey {  get ;  set ; }
         ///   <summary>
         ///  商品名称
         ///   </summary>
         public   string  GoodsName {  get ;  set ; }
         ///   <summary>
         ///  商品价格
         ///   </summary>
         public   decimal  GoodsPrice {  get ;  set ; }
    }

///   <summary>
     ///  顾客
     ///   </summary>
     public   class  Customer
    {
         ///   <summary>
         ///  对象标识
         ///   </summary>
         public  Guid OKey {  get ;  set ; }
         ///   <summary>
         ///  顾客姓名
         ///   </summary>
         public   string  CustomerName {  get ;  set ; }

private  List < Goods >  _goodss  =   new  List < Goods > ();
         ///   <summary>
         ///  顾客购买的商品
         ///   </summary>
         public  List < Goods >  Goodss
        {
             get  {  return  _goodss; }
             set  { _goodss  =  value; }
        }

///   <summary>
         ///  顾客选购商品
         ///   </summary>
         ///   <param name="goods"> 商品 </param>
         public   void  LikeBuy(Goods goods)
        {
             this ._goodss.Add(goods);
        }

///   <summary>
         ///  听收银员应收多少钱
         ///   </summary>
         ///   <param name="amount"></param>
         public   void  ListenAmount( decimal  amount)
        {
            Console.WriteLine( " 我是[{0}],我买了{1}件商品。我共花了{2}元RMB。 " ,  this .CustomerName,  this .Goodss.Count, amount.ToString( " f2 " ));
        }

///   <summary>
     ///  收银员
     ///   </summary>
     public   class  Cashier
    {
         ///   <summary>
         ///  对象标识
         ///   </summary>
         public  Guid OKey {  get ;  set ; }
         ///   <summary>
         ///  收银员姓名
         ///   </summary>
         public   string  CashierName {  get ;  set ; }

///   <summary>
         ///  收银
         ///   </summary>
         ///   <param name="customer"> 顾客 </param>
         public   void  CashRegister(Customer customer)
        {
             // 打开使用收银机
            CashRegister cashRegister  =   new  CashRegister();

// 对顾客的商品进行收银机扫码，收银
             foreach  (var goods  in  customer.Goodss)
            {
                 // 使用收银机扫商品进行收银
                cashRegister.CashRegisters(goods);
            }

// 通知顾客一共收多少钱
            customer.ListenAmount(cashRegister.ShowAmount());
        }
    }

///   <summary>
         ///  对象标识
         ///   </summary>
         public  Guid OKey {  get ;  set ; }
         ///   <summary>
         ///  收银机编号
         ///   </summary>
         public   string  CashRegisterNo {  get ;  set ; }

///   <summary>
         ///  总价格
         ///   </summary>
         private   decimal  _totalAmount {  get ;  set ; }

public  CashRegister()
        {
             // 收银总额置0
             this ._totalAmount  =   0 ;
        }

///   <summary>
         ///  收银
         ///   </summary>
         ///   <param name="goods"> 商品 </param>
         public   void  CashRegisters(Goods goods)
        {
             this ._totalAmount  +=  goods.GoodsPrice;
        }

///   <summary>
         ///  显示收银总额
         ///   </summary>
         ///   <returns></returns>
         public   decimal  ShowAmount()
        {
             return   this ._totalAmount;
        }

// 我们创建几样商品
            Goods RedWine  =   new  Goods() { GoodsName  =   " 红酒 " , GoodsPrice  =   1800 ,OKey = Guid.NewGuid() };
            Goods Condoms  =   new  Goods() { GoodsName  =   " 安全套 " , GoodsPrice  =   35 ,OKey = Guid.NewGuid() };

// 我们创建几位顾客
            Customer Chunge  =   new  Customer() { CustomerName  =   " 春哥 " , OKey  =  Guid.NewGuid() };
            Customer Beianqi  =   new  Customer() { CustomerName  =   " 贝安琪 " , OKey  =  Guid.NewGuid() };

// 当然，我们需要收银员啊
            Cashier CashierMM  =   new  Cashier() { CashierName  =   " 收银员MM " , OKey  =  Guid.NewGuid() };

// 顾客逛了一圈，选了自己想要的商品
            Chunge.LikeBuy(RedWine);
            Beianqi.LikeBuy(RedWine);
            Beianqi.LikeBuy(Condoms);

// 顾客开始排队结帐了
            Queue < Customer >  customerQueue  =   new  Queue < Customer > ();
            customerQueue.Enqueue(Chunge);
            customerQueue.Enqueue(Beianqi);

// 队伍过来，按先后顺序挨个收银喽
             foreach  (var customer  in  customerQueue)
            {
                 // 收银
                CashierMM.CashRegister(customer);
            }