Question

I have written some LINQ but it doesn’t return the correct data, it seems to ignore my where clause. Can anybody advise me on what I am doing wrong with the syntax?

IEnumerable<Ranking> lst = (from r in results
    join m in membersToRank on r.UserId equals m.userId
    join t in teamsToRank on m.teamId equals t.teamId
    where r.ResultDate >= rankingStart
        && r.ResultDate <= rankingEnd 
    select new Ranking
    {
        memberId = m.memberId,
        chain = t.chain,
        name = m.name,
        teamId = m.teamId,
        value = results.Count(i => i.IsCorrect && i.UserId == m.userId)
    }).ToList();

Answer 1

This line

value = results.Count(i => i.IsCorrect && i.UserId == m.userId)

will bypass the where clause. You have have to repeat the where there

value = results.Where(...).Count(i => i.IsCorrect && i.UserId == m.userId)

or

var results2 = results.Where(...)

and then use only results2.

(as a sidenote, it will even bypass the join, so it could become a little more complex depending on what you want)