能否介绍下目前国产测序仪各品牌的优劣势，以及展望下在销售市场上的格局。？

How to improve compare of item in sorted List<MyItem> with item before and after current item?

Does anyone know about a good way to accomplish this task? Currently i\'m doing it more ore less this way, but i\'m feeling someway unhappy with this code, unable to say what i could immediately impr