static void DoAdd() { Console.WriteLine("请输入用户名"); string user = Console.ReadLine(); int id = service.AddOrder(user); string endOp = "Y"; do { Console.WriteLine("输入商品名"); string gName = Console.ReadLine(); Console.WriteLine("输入数量"); int num = ReadAInt(); service.AddItem(id, gName.ToLower(), num); Console.WriteLine("是否继续添加Y/N"); endOp = Console.ReadLine(); } while (endOp.ToUpper() == "Y"); Console.WriteLine("订单已创建"); }