Adding a second Join with LINQ - linq

Question

I have this LINQ query and I need to make a second Join to it:
var linqQuery = (from r in gServiceContext.CreateQuery("opportunity")
join c in gServiceContext.CreateQuery("contact") on ((EntityReference)r["new_contact"]).Id equals c["contactid"] into opp
from o in opp.DefaultIfEmpty()
where ((EntityReference)r["new_channelpartner"]).Id.Equals(lProfileProperty.PropertyValue) && ((OptionSetValue)r["new_leadstatus"]).Equals("100000002")
select new
But I need to also Join this:
from r in gServiceContext.CreateQuery("annotation")
join c in gServiceContext.CreateQuery("opportunity") on ((EntityReference)r["objectid"]).Id equals c["opportunityid"]
Sorry, I'm sure this is easy. I suck at LINQ though. Any help would be great.
Thanks!

Answer 1

It's not really clear what you mean, but I suggest you want:
var linqQuery = from r in gServiceContext.CreateQuery("opportunity")
where ...
join c in gServiceContext.CreateQuery("contact")
on ((EntityReference)r["new_contact"]).Id
equals c["contactid"] into opp
from o in opp.DefaultIfEmpty()
join r in gServiceContext.CreateQuery("annotation")
on c["opportunityid"]
equals ((EntityReference)r["objectid"]).Id
select new...
It's not clear why you have to cast to EntityReference everywhere and access fields via their names as strings, by the way. Are you sure you can't use something like:
var linqQuery = from opportunity in gServiceContext.Opportunities
where opportunity.ChannelPartner.Id == targetChannelPartner
&& opportunity.NewLeadStatus == 100000002
join contact in gServiceContext.Contacts
on opportunity.Id equals contact.Id into contacts
from contactOrNull in contacts.DefaultIfEmpty()
join annotation in gServiceContext.Annotations
on annotation.ObjectId equals opportunity.OpportunityId
select ...;