Row_number over (Partition by xxx) in Linq?

ROW_NUMBER() OVER() PARTITION BY

sql中用 ROW_NUMBER() OVER() PARTITION BY 实现分组排序，具体如下：

https://www.cnblogs.com/willingtolove/p/10623841.html

在C#中，用linq代码实现sql中分组排序的方法，具体如下：

https://stackoverflow.com/questions/9980568/row-number-over-partition-by-xxx-in-linq