这就是我想出来的.

rows.Select(x => x.Where(y => y.StatusDate == x.Max(z => z.StatusDate)).First())

有一点解释：

rows.Select(x => // x is a group
  x.Where(y => // get all rows in that group where...
               // the status date is equal to the largest
               // status date in the group
    y.StatusDate == x.Max(z => z.StatusDate)
  ).First()) // and then get the first one of those rows

有没有更快或更惯用的方式来做到这一点？