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Editorial Team
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Asked: 2026-06-16T13:49:52+00:00

I’m a LINQ Newb and I’ve got this query, which returns the pages in

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I’m a LINQ Newb and I’ve got this query, which returns the pages in a survey. (These values are not materialized into a table, for whatever reason.)

//Group all of this data by page 
var pages = from fq in db.FormQuestions
        where (fq.FormId == id) && fq.Disabled == false
        group fq by fq.PageNumber into p
        select new DTOs.PageDTO { PageNumber = p.Key.Value };

And then I have this query, which projects all of the leaf-data into DTOs. 

var questions = from fq in db.FormQuestions
   join q in db.Questions on fq.QuestionId equals q.QuestionId
   where (fq.FormId == id) && fq.Disabled == false
   //where (fq.FormId == id) && fq.Disabled == false && fq.PageNumber == page
   orderby fq.DisplayOrder
   select new DTOs.FormQuestionDTO()
   {
       DisplayOrder = (fq.DisplayOrder.HasValue ? fq.DisplayOrder.Value : 0),
       PageNumber = (fq.PageNumber.HasValue ? fq.PageNumber.Value : 0),
       QuestionId = q.QuestionId,
       QuestionSelectionMode = q.vts_tbQuestionSelectionMode.Description,
       QuestionText = q.QuestionText,
       Answers =
           from answer in q.Answers
           join at in db.AnswerTypes on answer.AnswerTypeId equals at.AnswerTypeID
           where answer.Disabled == false
           orderby answer.DisplayOrder
           select new DTOs.AnswerDTO()
           {
               AnswerId = answer.AnswerId,
               AnswerText = answer.AnswerText,
               DisplayOrder = answer.DisplayOrder,
               AnswerType = at.Description
           }
   };

Is there a way to join these two neatly? I.e., under each page DTO I want to see the QUestion DTOs, then inside of that Answer DTOs, and onward…

Also, even if I could do this all in one LINQ statement, is it preferable to build the LINQ statements separately and then merge them? This feels a bit like building temp variables in SQL in that it may be possible to build one giant query but it’s a pain to maintain.

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1 Answer

  1. Editorial Team

    So why wouldn’t something like this work?

    //Group all of this data by page 
var pages = from fq in db.FormQuestions
        where (fq.FormId == id) && fq.Disabled == false
        group fq by fq.PageNumber into p
        select new DTOs.PageDTO { 
          PageNumber = p.Key.Value 
          questions = from fq in db.FormQuestions
                     join q in db.Questions on fq.QuestionId equals q.QuestionId
                     where (fq.FormId == id) && fq.Disabled == false
                     orderby fq.DisplayOrder
                     select new DTOs.FormQuestionDTO()
                     {
                       DisplayOrder = (fq.DisplayOrder.HasValue ? fq.DisplayOrder.Value : 0),
                       // etc as you 2nd code sample
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