static void Main(string[] args)
{
OrderDetails p1 = new OrderDetails("ll", "袜子");
OrderDetails p2 = new OrderDetails("df", "鞋子");
OrderDetails p3 = new OrderDetails("dh", "帽子");
OrderDetails p4 = new OrderDetails("dfs", "手套");
OrderService.AddOrder(p1);
OrderService.AddOrder(p2);
OrderService.AddOrder(p3);
OrderService.PrintAll();
OrderService.SeekByName("ll");
OrderService.SeekByNum(1);
OrderService.SeekByProduct("鞋子");
OrderService.DeleteAsPro("鞋子");
OrderService.change(p3, p4);
OrderService.PrintAll();
}