Question

In the LINQ query below, I want to return the ContractorId found in the Contractors table. Not all people in the Contacts table are in the Contractors table. What I really want is a list of ContractorIds for those contractors meeting the criteria. ContractorId is not the same as ContactId.

var contractorsWithCertsFor2010 = dc.Contacts.Where(x => x.Contractors
.Any(d => d.ContractorStatus
.Any(date => date.StatusDate.Year >= 2010)))
.Select(x => x.Contractors
.Select(dr => dr.ContractorId)); 

IEnumerable<int> differenceQuery = allPeople.Except(contractorsWithCertsFor2010);

allPeople is a IQueryable<Int> but contractorsWithCertsFor2010 is a IQueryable<IEnumerable<Int>>. Something isn’t right there. The multiple .Select() is causing the IQueryable<IEnumerable<Int>> so I’m looking for a way to eliminate one of the .Select() and get a return of

IQueryable<Int>

Any Suggestions? Thanks!

Solution:
One solution is posted in a reply below. I created another solution prior to seeing that one. In my solution, I started out in the Contractors table instead of the Contacts table, eliminating one layer and one .Select() statement.

Answer 1

Assuming you only want contractors that have contact record and since the only thing you selecting is the contractor id, you might want to try this:

var contractorsWithCertsFor2010 = dc.Contractors
    .Where(c => c.Contacts.Any() && c.ContractorStatus
        .Any(cs => cs.StatusDate.Year >= 2010))
    .Select(c => c.ContractorId);