Question

I think the answer should be easy, but I’m just struggling:

Would like to have data from 2 tables in a LINQ query similar to:

from f in Faults
join af in AvailabilityFaults on f.FaultID equals af.FaultID
join a in Availabilities on new { af.CalendarDay, af.CircuitNumber}
             equals new { a.CalendarDay, a.CircuitNumber}
join e in ExternalImportAvailabilities on new { a.CalendarDay, a.CircuitNumber }
                   equals new { e.CalendarDay, e.CircuitNumber }
where a.CalendarDay.Value.Day != 1
group f by f.FaultID into groupF
select new {groupF, e.CalendarDay}

The problem here comes in that it can’t find e.CalendarDay in the select clause.

I also tried things like: CalendarDay= e.Max(e=>e.CalendarDay), but e is not in the current context.

How can I add data from table ‘e’ in the select clause?

Answer 1

If I understood you properly, this is what you are looking for:

from f in Faults
join af in AvailabilityFaults on f.FaultID equals af.FaultID
join a in Availabilities on af.CalendarDay equals a.CalendarDay and af.CircuitNumber equals a.CircuitNumber
join e in ExternalImportAvailabilities on a.CalendarDay equals e.CalendarDay and a.CircuitNumber equals e.CircuitNumber
where a.CalendarDay.Value.Day != 1
group new {f, e} by f.FaultID into groupFE
select new {GroupF = groupFE.Select( gfe => gfe.f), CalendarDay = groupFE.Max( gfe => gfe.e.CalendarDay)}