求助，一个linq的查询问题

Question

详见代码static void Main(string[] args){    List<ScoreModel> scoreList = new List<ScoreModel>(){        new ScoreModel(){Id = 1, Score = 30},        new ScoreModel(){Id = 2, Score = 20},        new ScoreModel(){Id = 3, Score = 30},        new ScoreModel(){Id = 4, Score = 20},        new ScoreModel(){Id = 5, Score = 15},        new ScoreModel(){Id = 6, Score = 10},        new ScoreModel(){Id = 7, Score = 30},        new ScoreModel(){Id = 8, Score = 40},    };    int userScore = 33;    var result = from i in scoreList                    where [how to?]                    select i;                    //获取i.score小于userScore的最大值                    //即所有小于33的列表中取出最大值30的3个元素                    //期望结果：包含三个元素id=1,3,7的List<ScoreModel>}class ScoreModel{    public int Id { get; set; }    public int Score { get; set; }}

Answer 1

var result = (from x in scoreList              where x.Score < userScore
              group x by x.Score into g              orderby g.Key descending              select g).First();
//或者用

var result2 = scoreList.Where(x => x.Score < userScore)
       .GroupBy(x => x.Score)
       .OrderByDescending(g => g.Key)
       .First();