Left Outer Join

List<ServicePacksDTO> allServicePacks = new List<ServicePacksDTO>();
        using (var db = new DataContext())
        {
            allServicePacks=(
                    from sp in db.ServicePacks
                    join st in db.States.DefaultIfEmpty() on sp.State_id equals st.State_Id
                    join type in db.ServiceTypes on sp.ServiceType_Id equals type.ServiceType_Id
                    where
                     (type.ServiceType_desc.ToLower() == "accepted") 
                    orderby sp.AustState_id
                    select sp.ToServicePacksDTO(db)).ToList();
        }

The current code works fine, until开发者_如何学Python I attempt to do an outer join on state. Is there away to do this easily?

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Well firstly, you need to provide a bit more detail that "works fine, until i attempt to do xx".

What doesn't work? Is there an error? Unexpected results?

Forgetting about the DTO projection and db.ServiceTypes join, to do a LOJ between db.ServicePacks and db.States, do this:

var x = (from sp in db.ServicePacks
join st in db.States on sp.State_id equals st.State_id into spst
from x in spst.DefaultIfEmpty()
select new { /* fields */ }
).ToList();

Try that first, make sure that works (it should), and then add on your other join and projection.