SQL "WHERE IN" query conversion to LINQ - entity-framework

Question

I'm trying to find a way to convert this very complex SQL Query into LINQ and I can't seem to tackle all the embedded "WHERE IN" clauses. Would someone be so kind as to lend me a helping hand?
Here is the SQL code (don't worry about the stored procedure, it's a count of a row total)
SELECT
(SELECT pac.Name FROM Account pac WHERE pac.AccountID = AC.ParentAccountID) AS ParentAccountName,
ac.Name, dv.DeviceID, dv.Manufacturer, dv.Model, dv.SerialNr, dv.PrinterIPAddress,
(SELECT TOP 1 au.AuditDate FROM PrinterAudit pa WITH (NOLOCK) INNER JOIN Audit au ON au.AuditID = pa.AuditID
WHERE pa.DeviceID=dv.DeviceID
ORDER BY AuditDate DESC) AS AuditDate,
dbo.Get_TotalPageCountByDeviceId( DATEADD(month, -3, GETDATE()), GETDATE(), dv.DeviceID ) as TotalUsageLast3Months
FROM Account ac WITH (NOLOCK)
INNER JOIN Device dv ON ac.AccountID = dv.AccountID
WHERE dv.AccountID IN
( SELECT au.AccountID FROM Audit au WHERE au.AuditDate >= DATEADD(month, -3, GETDATE()) )
AND (dv.Manufacturer + dv.Model) IN
(SELECT (dv2.Manufacturer + dv2.Model)
FROM Device dv2
WHERE dv2.AccountID = dv.AccountID
AND dv2.Manufacturer = dv.Manufacturer
AND dv2.Model = dv.Model
AND (dv2.ERPEquipID IS NOT NULL OR dv2.ERPData IS NOT NULL ) )
AND dv.ERPEquipID IS NULL AND dv.ERPData IS NULL
AND dv.DeviceID IN
(SELECT pa.DeviceID
FROM PrinterAudit pa WITH (NOLOCK)
INNER JOIN Audit au ON au.AuditID = pa.AuditID
WHERE au.AuditDate >= DATEADD(month, -3, GETDATE()))
ORDER BY ParentAccountName, ac.Name
Final Result:
var result =
(from dv in Device
where Audit.Any(au => au.AuditDate >= DateTime.Now.AddMonths(-3)
&& au.AccountID == dv.AccountID)
where Device.Any(dv2 => dv2.AccountID == dv.AccountID
&& dv2.Manufacturer == dv.Manufacturer
&& dv2.Model == dv.Model
&& (dv2.ERPEquipID != null || dv2.ERPData != null)
&& dv.ERPEquipID == null
&& dv.ERPData == null
&& PrinterAudit.Any(pa => pa.Audit.AuditDate >= DateTime.Now.AddMonths(-3) && pa.DeviceID == dv.DeviceID))
orderby dv.Account.ParentAccountID, dv.Account.Name
select new
{
ParentAccountName = Account.Where(pac => pac.AccountID == dv.Account.ParentAccountID).Select(pac => pac.Name),
Name = dv.Account.Name,
DeviceID = dv.DeviceID,
Manufacturer = dv.Manufacturer,
Model = dv.Model,
SerialNumber = dv.SerialNr,
PrinterIPAddress = dv.PrinterIPAddress,
AuditDate = (from pa in PrinterAudit where pa.DeviceID == dv.DeviceID orderby pa.Audit.AuditDate descending select pa.Audit.AuditDate).Take(1),
TotalUsageLast3Months = (from p in PrinterAudit
where p.DeviceID == dv.DeviceID
group p by p.DeviceID into total
select new
{
Total = Get_TotalPageCountByDeviceId(DateTime.Now.AddMonths(-3), DateTime.Now, dv.DeviceID)
})
});

Answer 1

You convert the SQL IN statement to linq with either Contains or Any
Contains
from dv in db.Device
where
(from au in db.Audit
where au.AuditDate >= DateTime.Now.AddMonths(-3)
select au.AccountID).Contains(dv.AccountID)
Any
from dv in db.Device
where
db.Audit.Any(au => au.AuditDate >= DateTime.Now.AddMonths(-3) &&
au.AccountID == dv.AccountID)