Question

I have the following SQL query:

SELECT DISTINCT 
  Participant.BackgroundTrainingID, 
  Location.TrainingSite
FROM Registration, ProgramLocation, Participant, Program, Location
WHERE ProgramLocation.LocationID = Location.LocationID 
  AND ProgramLocation.ProgramID=Registration.ProgramID 
  AND Registration.ParticipantID=Participant.ParticipantId

I wrote the following LINQ to SQL to match the query above:

var trainingsiteinfo = (from c in db.ProgramLocations 
                        from n in db.Registrations 
                        from l in db.Participants  
                        from h in db.Locations 
                        where c.LocationID == h.LocationID 
                          && c.ProgramID == n.ProgramID 
                          && n.ParticipantID == l.ParticipantId 
                        select new { 
                          h.TrainingSite, 
                          l.BackgroundTrainingID }).Distinct();

The SQL query works fine but LINQ constantly returns null.

Answer 1

I use Linqer http://www.sqltolinq.com/ when i get out of ideas 🙂 Aswell it speeds up conversion jobs.