Forum Post: RE: LINQ query error: Trying to join multiple entities using Early Bound

Thanks for all your responses. I did the following workaround.

1. Make a query that retrieve a list of all the Student enrollments
2. Use the Find method of the List<T> class to find if a record exist with the conditions I am searching for.

var query2 = (from e in svsContext.xrmsm_sessionEnrollmentsSet
join s in svsContext.xrmsm_sessionsSet on e.xrmsm_SessionLookup.Id equals s.xrmsm_sessionsId
join ic in svsContext.xrmsm_institutionCoursesSet on s.xrmsm_institutionCourseLookup.Id equals ic.xrmsm_institutionCoursesId
join ts in svsContext.xrmsm_term_sessionsSet on e.xrmsm_termSessionLookup.Id equals ts.xrmsm_term_sessionsId
join t in svsContext.xrmsm_termsSet on ts.xrmsm_TermLookup.Id equals t.xrmsm_termsId
where (e.xrmsm_StudentLookup.Equals(studentlookup))
select new
{
EnrollmentId = e.xrmsm_sessionEnrollments_id,
SessionId = s.xrmsm_sessions_id,
EnrollmentYear = e.xrmsm_YearLookup,
InstitutionCourseId = (Guid)ic.xrmsm_institutionCoursesId,
TermId = (Guid)t.xrmsm_termsId,
Student = e.xrmsm_StudentLookup
}).ToList();


var q = query2.Find(r => r.EnrollmentYear.Id == entity.GetAttributeValue("xrmsm_yearlookup").Id
&& r.InstitutionCourseId == institutionCourseGuid
&& r.TermId == termGuid);