LINQ有多個選擇和組由多個選擇

Question

我有一個表是這樣的：

First Field | Second Field | Third Field | Fourth Field 
------------+--------------+----------------+---------------- 
5  |  aaaa  |  47   |  abc 
5  |  aaaa  |  57   |  def 
5  |  aaaa  |  63   |  xyz 
5  |  bbbb  |  39   |  www 
5  |  bbbb  |  37   |  lol 
5  |  cccc  |  84   |  yuy 

我希望將這個表由第一和第二場，但我想只能用最大的行第三個領域。

我怎樣才能通過LINQ在c＃中做到這一點？

var curi = (from row in customClassList.AsEnumerable() 
        group row by new 
        { 
         First = row.FirstField.ToString(), 
         Second = row.SecondSield.ToString(), 
        } into grp 
        select new FieldsClass 
        { 
         First = grp.Key.First, 
         Second = grp.Key.Second, 
         Third = grp.Select(p => p.ThirdField).Max().ToShort(), 
         Fourth = grp.Key.Fourth 
        }).ToList(); 

這是我期望的結果：

First Field | Second Field | Third Field | Fourth Field 
------------+--------------+----------------+---------------- 
5  |  aaaa  |  63   |  xyz 
5  |  bbbb  |  39   |  www 
5  |  cccc  |  84   |  yuy 

Answer 1

如何

var result = customClassList.GroupBy(x => new {x.FirstField, x.SecondField}) 
          .Select(x => x.OrderByDescending(y => y.ThirdField).First());