从GetView（）方法中的同一ListView行的列表中返回重复值的最佳方法是什么？

I have some data in a list that shows for example the Item Number, Line Number, Quantity, and Pack Size of an order. The problem is that some lines on the order will have the same item number but different quantities, pack sizes or both. For example : I have some data in a list that shows for examp