连接到分组查询

Question

我是一个LINQ Newb，我有这个查询，它返回调查中的页面。(无论出于何种原因，这些值都不会具体化到表中。)

//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 };

然后我有这个查询，它将所有叶数据投影到DTO中。

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
           }
   };

有没有一种方法可以很好地把这两个结合起来？也就是说，在每个页面DTO下，我希望看到QUestion DTO，然后在该答案DTO内，然后继续...

此外，即使我可以在一条LINQ语句中完成所有这些工作，是否更可取的做法是单独构建LINQ语句，然后将它们合并？这感觉有点像在SQL中构建临时变量，因为它可能构建一个巨大的查询，但维护起来很痛苦。

Answer 1

那么为什么像这样的东西不能工作呢？

//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