Question

Can someone convert this to C# LINQ for me please ??

SELECT *
FROM   vf
       LEFT JOIN dbvf
       ON     vf.sid  =dbvf.sid
       AND    vf.cid  =dbvf.cid
WHERE  dbvf.sid IS NULL

Both vf and dbvf are List<T>. sid and cid are integers.

What I am trying to do is find items in vf that are missing in dbvf.

Answer 1

try this

                  var ret =   from p1 in vf
                              join p2 in dbvf
                              on p1.sid equals p2.sid && p1.cid equals p2.cid into g
                              from p2 in g.DefaultIfEmpty()
                              where p2 == null
                              select new {vf=p1, dbvf=p2}

or this simple

vf.Except(dbvf);