Question

I can’t get the right result, maybe it broke at the first query, can someone find the problem.

var query = from case in dbEntity.Cases
    join Comm in dbEntity.Comms on case.log_id equals comm.CaseId into collection
    from subCase in collection.DefaultIfEmpty()
    select new { case, subCase.status };

I want to get all the Cases and the status value in Comms. log_id and CaseId are the join keys.

Answer 1

var query = from case in dbEntity.Cases
join Comm in dbEntity.Comms on case.log_id equals comm.CaseId into collection
from subCase in collection.DefaultIfEmpty()
select new { Case=case,Status= (subCase==null?null:subcase.Status };