Question

Can someone help me with converting this query to a Linq to entities query in the proper way. I am fairly new to Linq and want to write these queries properly. This is a fairly involved one for what im doing with UNION and sub queries in it

SELECT pf.FileID, pf.ServerName, pf.MigrationType 
FROM pOrders pf 
WHERE pf.FileID IN (select GCMFileID FROM Signals
                    where SignalFileID = " + FileID + ")
UNION 
SELECT pf.FileID, pf.ServerName, pf.MigrationType
FROM pOrders pf 
WHERE pf.FileID = " + FileID + "
order by pf.MigrationType desc

Answer 1

I know, I saw comments… but

var signalIds = Signals.Where(s => s.SignalFileId = FILEID).Select(x => x.GCMFileID ).ToArray();

pOrders.Where(pf => signalIds.Contains(pf.FileID))
.Union(
pOrders.Where(pf => pf.FileID == FILEID))
.OrderByDescending(u => u.MigrationType)
.Select(u => new {u.FileID, u.ServerName, u.MigrationType});