static void Main(string[] args) { OrderService orderService = new OrderService(); Console.WriteLine("请输入用户姓名:"); string name = Console.ReadLine(); Client client = new Client(name); bool again = true; while (again) { Console.WriteLine("选择所用功能"); Console.WriteLine("1.添加订单"); Console.WriteLine("2.删除订单"); Console.WriteLine("3.修改订单"); Console.WriteLine("4.查询订单"); Console.WriteLine("5.退出"); string a = Console.ReadLine(); switch (a) { case "1": Console.WriteLine("请输入订单id:"); string id1 = Console.ReadLine(); Order order = new Order(id1, client); order.AddOrderDetail(); orderService.AddOrder(order); break; case "2": Console.WriteLine("请输入订单id:"); string id2 = Console.ReadLine(); orderService.DeleteOrder(id2); break; case "3": Console.WriteLine("请输入订单id:"); string id3 = Console.ReadLine(); orderService.ChangeOrder(id3); break; case "4": Console.WriteLine("请输入订单id:"); string id4 = Console.ReadLine(); orderService.SeletOrder(id4); break; case "5": again = false; break; default: Console.WriteLine("无效的输入. 请选择1-5的数字"); break; } } }