Expression cannot contain lambda expressions

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var selpartNumber1 = from a in db.TEMPORARY_QUESTs
from b in db.QUESTIONs
from c in db.QUEST_SCATTERINGs
where a.QUESTIONNAIRE_NO == prm_quest_no &&
a.VERSION_NO == prm_version_no &&
a.MIKZOA_BHINA == prm_mikzoa_bhina &&
a.PATTERN_NUMBER == prm_pattern_number &&
a.GENERTED_DATE == ttaarich_last_use &&
a.GENERTED_TIME == (decimal)ttime_use &&
a.SERIAL_QESTION == b.SERIAL_QESTION &&
b.MIKZOA_BHINA == c.MIKZOA_BHINA &&
b.CHAPTER_CODE == c.CHAPTER_CODE &&
b.SUBJECT_CODE == c.SUBJECT_CODE &&
a.QUESTIONNAIRE_NO == c.QUESTIONNAIRE_NO &&
a.VERSION_NO == c.VERSION_NO &&
a.MIKZOA_BHINA == c.MIKZOA_BHINA &&
a.PATTERN_NUMBER == c.PATTERN_NUMBER &&
c.PART_NUMBER == 1
orderby c.PART_NUMBER ,
b.QUESTION_KIND ascending,
b.HISTOTY_DRAFTING ascending,
a.SEQ_4_QUESTION ascending
select new
{
a.SEQ_4_QUESTION,
a.SERIAL_QESTION,
b.HISTOTY_DRAFTING,
b.QUESTION_KIND
};

Random rand = new Random();
var shuffledList = selpartNumber1.OrderBy(x => rand.Next(1, selpartNumber1.Count())).ToList();

What I have tried:

advice ?????????????????????????????????????????????????????????????????

Posted 14-Nov-18 5:45am

Member 14054644

Updated 16-Nov-18 5:40am

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Vincent Maverick Durano 14-Nov-18 16:05pm

Which line causes the error? What are you trying to do?

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Richard Deeming · Accepted Answer · 2018-11-16T05:40:00

rand.Next(1, selpartNumber1.Count()) cannot be converted into a SQL query.

Since you're loading the entire set of results into memory, you need to do the sorting in-memory instead of in SQL.

You should also avoid counting the results of the query to generate the random number - especially as you're doing it in a loop! Order by Guid.NewGuid() instead.

C#

var shuffledList = selpartNumber1.AsEnumerable().OrderBy(x => Guid.NewGuid()).ToList();

NB: Using Guid.NewGuid() should also work if you're sorting in SQL; but there was a bug with queries that contained joins which caused duplicate data:
c# - Linq to Entities, random order - Stack Overflow[^]