SQL statement to linq lambda Orderby

本文关键字：lambda Orderby linq to statement SQL | 更新日期: 2023-09-27 18:20:52

我有这个sql语句：

SELECT QuestionNo，ActivityID，GROUP_CONCT（CONCAT（问题，"["，
答案，']'）分隔符''）从问题GROUP BY加入
问题编号，活动ID订单按问题提示ID

我需要把它放在linq lambda中，到目前为止我有

 IList<QuestionHint> lstRecords = context.questionhints.GroupBy(x => new { x.QuestionNo, x.ActivityID, x.TaskID }).ToList().Select(g => new QuestionHint()
        {
            QuestionNo = g.Key.QuestionNo,
            ActivityID = g.Key.ActivityID,
            TaskID = g.Key.TaskID,
            joined = String.Join(" ",
                    g.Select(i => i.QuestionContent + "[" + i.Answer + "]")),
            joinOption = String.Join(" ",
                   g.Select(a => "[" + a.Option1 + "," + a.Option2 + "]"))
        }).Where(x => x.TaskID == listTask && x.ActivityID == listActivity)
            //.Take(50)
           .ToList();
        return lstRecords;

如何添加Orderby？因为当我在查询中使用联接时，检索到的记录是无序的，因为顺序不能保证是有序的。我如何将OrderBy questionHintID（表的主键）添加到上面的lambda中？

SQL statement to linq lambda Orderby

您尝试过.OrderByDescending（questionhints=>questionhint.ID）吗？希望这能有所帮助！！

我想我理解你的意思。可能应该是这样的：（注意OrderBy语句）

var lstRecords = context.questionhints
.Where(x => x.TaskID == listTask && x.ActivityID == listActivity)
.GroupBy(x => new { x.QuestionNo, x.ActivityID, x.TaskID })
.AsEnumerable()
.Select(g => new QuestionHint()
        {
            QuestionNo = g.Key.QuestionNo,
            ActivityID = g.Key.ActivityID,
            TaskID = g.Key.TaskID,
            joined = String.Join(" ",
                       g.OrderBy(q => q.questionHintID)
                        .Select(i => i.QuestionContent + "[" + i.Answer + "]")),
            joinOption = String.Join(" ",
                       g.OrderBy(q => q.questionHintID)
                        .Select(a => "[" + a.Option1 + "," + a.Option2 + "]"))
        })
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