static void Main(string[] args) { OrderService orderService = new OrderService(); int flag = 0; while (true) { Console.WriteLine("请选择需要执行的操作(输入数字):"); Console.WriteLine("1.添加新订单"); Console.WriteLine("2.删除订单"); Console.WriteLine("3.查询订单"); Console.WriteLine("4.修改订单"); Console.WriteLine("5.查看订单列表"); Console.WriteLine("6.输出订单"); Console.WriteLine("7.导入订单"); Console.WriteLine("8.退出"); try { flag = Int32.Parse(Console.ReadLine()); if (flag < 1 || flag > 8) { throw new OrderException(); } else { switch (flag) { case 1: orderService.AddOrder(); break; case 2: orderService.DeleteOrder(); break; case 3: orderService.Search(); break; case 4: orderService.EditOrder(); break; case 5: orderService.DisplayOrderList(); break; case 6: orderService.Export(@"output.xml"); break; case 7: orderService.Import(@"output.xml"); break; case 8: return; } } } catch (Exception) { Console.WriteLine("输入有误!"); } } }