'IN' & 'NICHT IN' in Linq Abfrage

Question

Ich habe die folgende Abfrage in LINQPad getestet und es läuft gut, aber VS2010 mag es nicht.

var topJobs = from j in streetlightDBEntities.Job 
    let mjobid = from m in streetlightDBEntities.Job.Include("Streetlight") 
       where m.Streetlight.StreetlightId == j.Streetlight.StreetlightId 
       orderby m.DateCompleted descending 
       select m.JobId 
     where mjobid.Take(5).Contains(j.JobId) 
     select j.JobId; 

var notTopJobs = streetlightDBEntities.Job.Where(c => !topJobs.Contains(c.JobId)); 

Ich habe folgende Fehlermeldung:

LINQ to Entities does not recognize the method 'Boolean Contains[String](System.Linq.IQueryable`1[System.String], System.String)' method, and this method cannot be translated into a store expression.

Answer 1

Verwendung Queryable.Any<TSource>.

Statt dessen:

var notTopJobs = streetlightDBEntities 
     .Job 
     .Where(c => !topJobs.Contains(c.JobId)); 

tun:

var notTopJobs = streetlightDBEntities 
     .Job 
     .Where(c => !topJobs.Any(x => x.JobId == c.JobId)) 

das gleiche für Ihre ursprüngliche Abfrage durchführen.