如何使用 linq 按某些字段选择整个顶行组

我尝试从列表中选择一个项目，该项目对于归档的频率最高，因此我根据该归档对项目进行分组并按降序排序。现在我想选择顶行。

我试过了：

    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;
    }

我应该使用什么而不是???来选择项目的所有字段（整个项目）（顶行）。

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;
}