public static void OrderMenu() { while (true) { Console.WriteLine(); Console.WriteLine(); Console.WriteLine("************************订单管理系统************************"); Console.WriteLine("此系统含有订单,可修改Xml文件来修改订单或批量添加订单"); Console.WriteLine(" 1.添加订单 2.删除订单 "); Console.WriteLine(" 3.修改订单 4.查找订单 "); Console.WriteLine(" 5.清空所有订单 6.显示订单"); Console.WriteLine(" 7.退出"); int choose = 0; Choose(ref choose, 1, 8); switch (choose) { case 1: AddOrder(); break; case 2: DeleteOrder(); break; case 3: ChangeOrder(); break; case 4: FindOrder(); break; case 5: OrderService.CLearOrders(); break; case 6: OrderService.ShowAllOrders(); break; case 7: return; } } }