Question

I have defined two entities that map to two tables in my database. In SQL I would do a join like this:

select *
from tableA a
left outer join tableB b on b.ID = a.ID
where some condition

How might I do this with a LINQ query?

Answer 1

See: How to: Perform Left Outer Joins (C# Programming Guide) on MSDN.

For example:

var query = from person in people
    join pet in pets on person equals pet.Owner into gj
    from subpet in gj.DefaultIfEmpty()
    select new { person.FirstName, PetName = (subpet == null ? String.Empty : subpet.Name) };