LINQ选择具有不同ForeignKeyId列的最新记录

Question

I have the following SQL query:

SELECT 
   table1.Id AS EinAusgangId, 
   table1.Ausgabedatum, 
   table1.Rueckgabedatum, 
   table1.WerkzeugId, 
   cpmWerkzeug.Name
FROM cpmEinAusgang AS table1 
INNER JOIN cpmWerkzeug ON table1.WerkzeugId = cpmWerkzeug.Id
WHERE table1.Id = (SELECT MAX(Id) AS Expr1 
                   FROM dbo.cpmEinAusgang
                   WHERE table1.WerkzeugId = WerkzeugId)

My aim is to convert the whole query into a LINQ statement for further use in a .Net Application. I already converted joined tables to LINQ but is it also possible to use a select in the where clause?

This is what I got so far, which gives me almost the same result as the SQL statement above, but has major errors when the table cpmEinAusgang contains more then one record for one cpmWerkzeug

using (var dbContext = new cpmEntities())
{
  var werkzeuge = from w in dbContext.cpmWerkzeug
  join e in dbContext.cpmEinAusgang
  on w.Id equals e.WerkzeugId
  where e.Rueckgabedatum == null
  orderby w.Name
  select w;

  return werkzeuge.ToList();
}

Has anyone an idea how to achieve the above sql in linq? Thanks for your help. :)

EDIT:solved (see below)

Answer 1

var werkzeugeImUmlauf = from w in dbContext.cpmWerkzeug
                                join e in dbContext.cpmEinAusgang
                                on w.Id equals e.WerkzeugId
                                where e.Id == dbContext.cpmEinAusgang.Where(x => x.WerkzeugId == e.WerkzeugId).Max(x => x.Id) select w;

This is the final solution. As mentioned by Mittal in his answer, it is possible to write a sub-query in LINQ.

Answer 2

Yes, you can write Sub Query in LINQ as well.

 var werkzeuge = from w in dbContext.cpmWerkzeug
  join e in dbContext.cpmEinAusgang
  on w.Id equals e.WerkzeugId
  where w.id = (dbContext.cpmEinAusgang.Max(x => x.id)) AND w.WerkzeugId = WerkzeugId