LINQ to SQL multiple left join query with subquery at join condition - sql

Question

I have a SQL query that takes a subquery as a parameter for a left join.
SELECT tblfLeaseDetail.Lease_Detail_ID,
tblfPayment.Payment_Date,
tblfAuthorization.Authorized,
tblvVendor.Vendor_Name,
tblvCounty.County
FROM tblfLeaseDetail
LEFT
JOIN tblfPayment
ON tblfPayment.Lease_Detail_ID = tblfLeaseDetail.Lease_Detail_ID
AND tblfPayment.Payment_ID =
( SELECT TOP 1
Payment_ID
FROM tblfPayment
WHERE tblfPayment.Lease_Detail_ID = tblfLeaseDetail.Lease_Detail_ID
ORDER BY Payment_Date DESC
)
LEFT
JOIN tblfAuthorization
ON tblfAuthorization.Lease_Detail_ID = tblfLeaseDetail.Lease_Detail_ID
AND tblfAuthorization.Authorization_ID =
( SELECT TOP 1
Authorization_ID
FROM tblfAuthorization
WHERE tblfAuthorization.Lease_Detail_ID = tblfLeaseDetail.Lease_Detail_ID
ORDER BY Authorized_Date DESC
)
LEFT JOIN tblvVendor
on tblvVendor.Vendor_ID = tblfLeaseDetail.Vendor_ID
LEFT JOIN tblvCounty
on tblvCounty.County_ID = tblfLeaseDetail.County_ID
I'm trying to convert it to LINQ. So far this is what I've done:
var leaseList = (from l in leases.tblfLeaseDetails
join a in leases.tblfAuthorizations on l.Lease_Detail_ID equals a.Lease_Detail_ID into la
from jla in
(from aj in leases.tblfAuthorizations
where aj.Lease_Detail_ID == l.Lease_Detail_ID
orderby aj.Authorized_Date descending
select aj.Authorization_ID).Take(1).DefaultIfEmpty()
join p in leases.tblfPayments on l.Lease_Detail_ID equals p.Lease_Detail_ID into lp
from jlp in
(from pj in leases.tblfPayments
where pj.Lease_Detail_ID == l.Lease_Detail_ID
orderby pj.Payment_Date descending
select pj.Payment_ID).Take(1).DefaultIfEmpty()
join v in leases.tblvVendors on l.Vendor_ID equals v.Vendor_ID into lv
from jlv in lv.DefaultIfEmpty()
join c in leases.tblvCounties on l.County_ID equals c.County_ID into lc
from jlc in lc.DefaultIfEmpty()
select new LeaseViewModel()
{
Lease_Detail_ID = l.Lease_Detail_ID,
Vendor_Name = jlv.Vendor_Name,
County = jlc.County,
Authorization = jla.Authorized,
Payment_Date = jlp.Payment_Date
}).Distinct()
This returns me an error at jla.Authorized and jlp.Payment_Date:
'int' does not contain a definition for 'Authorized' and no extension method 'Authorized' accepting a first argument of type 'int' could be found
The same error goes for Payment_Date.
Why are jla and jlp being considered ints? How can I make this query work?
EDIT:
This is the final and working LINQ query:
var leaseList = (from l in leases.tblfLeaseDetails
join a in leases.tblfAuthorizations on l.Lease_Detail_ID equals a.Lease_Detail_ID into la
from jla in la.DefaultIfEmpty()
where jla.Authorization_ID == (from aj in leases.tblfAuthorizations
where aj.Lease_Detail_ID == l.Lease_Detail_ID
orderby aj.Authorized_Date descending
select aj.Authorization_ID).Take(1).FirstOrDefault()
join p in leases.tblfPayments on l.Lease_Detail_ID equals p.Lease_Detail_ID into lp
from jlp in lp.DefaultIfEmpty()
where jlp.Payment_ID == (from pj in leases.tblfPayments
where pj.Lease_Detail_ID == l.Lease_Detail_ID
orderby pj.Payment_Date descending
select pj.Payment_ID).Take(1).FirstOrDefault()
join v in leases.tblvVendors on l.Vendor_ID equals v.Vendor_ID into lv
from jlv in lv.DefaultIfEmpty()
join c in leases.tblvCounties on l.County_ID equals c.County_ID into lc
from jlc in lc.DefaultIfEmpty()
select new LeaseViewModel()
{
Lease_Detail_ID = l.Lease_Detail_ID,
Lease_ID = l.Lease_ID,
XRef_Lease_ID = l.XRef_Lease_ID,
Vendor_Name = jlv.Vendor_Name,
Description = l.Description,
County = jlc.County,
Amount = l.Amount,
Payment_Due_Date = l.Payment_Due_Date,
Lease_Type = l.Lease_Type.ToString(),
Location_ID = l.Location_ID,
Active = l.Active,
Expiration_Date = l.Expiration_Date,
Authorization = jla.Authorized,
Payment_Date = jlp.Payment_Date
}).Distinct();

Answer 1

That is because you are selecting Authorization_ID and Payment_ID which are of type int into jla and jlp respectively . Try the below query and let me know how it worked for you.
var leaseList = (from l in leases.tblfLeaseDetails
join a in leases.tblfAuthorizations on l.Lease_Detail_ID equals a.Lease_Detail_ID into la
from jla in
(from aj in leases.tblfAuthorizations
where aj.Lease_Detail_ID == l.Lease_Detail_ID
orderby aj.Authorized_Date descending
select aj).Take(1).DefaultIfEmpty()
join p in leases.tblfPayments on l.Lease_Detail_ID equals p.Lease_Detail_ID into lp
from jlp in
(from pj in leases.tblfPayments
where pj.Lease_Detail_ID == l.Lease_Detail_ID
orderby pj.Payment_Date descending
select pj).Take(1).DefaultIfEmpty()
join v in leases.tblvVendors on l.Vendor_ID equals v.Vendor_ID into lv
from jlv in lv.DefaultIfEmpty()
join c in leases.tblvCounties on l.County_ID equals c.County_ID into lc
from jlc in lc.DefaultIfEmpty()
select new LeaseViewModel()
{
Lease_Detail_ID = l.Lease_Detail_ID,
Vendor_Name = jlv.Vendor_Name,
County = jlc.County,
Authorization = jla.Authorized,
Payment_Date = jlp.Payment_Date
}).Distinct()