to fix this, you can create a sort procedure in a class that uses the standard alphabetic sort on most list boxes, but is able to switch at run time to the custom sort procedure for car ads.
若要解决这一问题,可以在某个类中创建一个排序过程,该类在多数列表框中使用标準字母排序,但是它可以在运行时切换为汽车广告的自定义排序。