Question

i have a table that has zero to many children. just like how this site has a QUESTION which can have zero to many VOTES (either Up == 1 or Down == 0).

I need to get all questions that have the most up votes. Eg. all the questions, ordered by Sum(Vote) descending.

I’m not sure how to do it in linq.

So i would have an EntitySet called Questions and another EntitySet called Votes.

I was trying to do group by and let and order by and nothing compiles 🙁

Could anyone have any suggestions, please?

Answer 1

myDataContext.Questions   .OrderByDescending(q => q.Votes.Select(v => v.VoteValue).Sum()) 

In query comprehension (unchecked):

from q in myDataContext.Questions order q by  (   from v in q.Votes   select v.VoteValue ).Sum() descending select q;