static void Main(string[] args) { OrderService or = new OrderService(); while (or.p) { Console.WriteLine("请输入要进行的操作:"); string action = Console.ReadLine(); switch (action) { case "add": or.Add(); break; case "delete": or.Delete(); break; case "scan": or.Scan(); break; case "break": or.Break(); break; case "linq": or.Linq(); break; } } }