如何使用linq選擇整個頂行組的一些字段

Question

我嘗試從一個列表中選擇一個項目的頻率最高的項目，所以我根據該項目對項目進行分組，並對它們進行降序排序。現在我想選擇最上面一行。

我想：

private Rule MatchRule(string cond) 
    { 

     var results = (from x in rules 
         where x.Cond == cond 
         group x by new { x.Tree.Val , r = x.Tree.Right.Val, l = x.Tree.Left.Val} 
         into g 
         select new { 
         rule = ???, 
          Count=g.Count(), 
         }).OrderByDescending(x => x.Count).ToList(); 
     return results[0].rule; 
    } 

我應該用什麼來代替???選擇項目（整個項目）（前行）的各個領域。

Answer 1

我找到了，我必須用First()選擇整行

private Rule MatchRule(string cond) 
{ 

    var results = (from x in rules 
        where x.Cond == cond 
        group x by new { x.Tree.Val , r = x.Tree.Right.Val, l = x.Tree.Left.Val} 
        into g 
        select new { 
        rule = g.First(), 
         Count=g.Count(), 
        }).OrderByDescending(x => x.Count).ToList(); 
    return results[0].rule; 
}