使用LINQ选择最常用的值

本文关键字:常用 LINQ 选择 使用 | 更新日期: 2023-09-27 18:02:28

我试图选择表中最常见的前五个值,并在列表中返回它们。

    var mostFollowedQuestions = (from q in context.UserIsFollowingQuestion
                                 select *top five occuring values from q.QuestionId*).toList();

任何想法?

谢谢

使用LINQ选择最常用的值

var mostFollowedQuestions = context.UserIsFollowingQuestion
                                    .GroupBy(q => q.QuestionId)
                                    .OrderByDescending(gp => gp.Count())
                                    .Take(5)
                                    .Select(g => g.Key).ToList();
 int[] nums = new[] { 1, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7 };
 IEnumerable<int> top5 = nums
            .GroupBy(i => i)
            .OrderByDescending(g => g.Count())
            .Take(5)
            .Select(g => g.Key);