Question

我有这个sql语句：

SELECT QuestionNo，ActivityID，GROUP_CONCAT（CONCAT（问题，'['，
答案，']'）分离器''）AS从问题GROUP BY中加入 QuestionNo，ActivityID OrderBy questionHintID

我需要在linq lambda中使用它，到目前为止我所拥有的是

 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join时，检索的记录是乱序的，因为订单不能保证顺序如何将OrderBy questionHintID（表的主键）添加到上面的lambda中？

Answer 1

您是否尝试过.OrderByDescending（questionhints =＆gt; questionhint.ID）？希望这会有所帮助!!

Answer 2

我想我明白你的意思。它应该是这样的:(注意OrderBy陈述）

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 + "]"))

        })

SQL语句到linq lambda Orderby

2 个答案: