.net - LINQ to SQL: How to check if any item in one entity collection exists in another entity collection? -


i'm using mvc2 , entity framework.

i have 2 entity collections , need compare them , check if have items in common. example, have entitycollection<candidate> , entitycollection<job>. i'm trying return candidates have skill listed in job's preferred skills. correct:

public iqueryable<candidate> getmatchingcandidates(job job) {                      return candidate in _db.candidates      (candidate.candidateskills.where(c => job.jobpreferredskills.any(j => j.skillid== c.skillid)).count() > 0)       select candidate;                                 }

similarly, i'd candidates have skills listed in preferred skills.

i'd use any() in first case:

    public iqueryable<candidate> getmatchingcandidates(job job)     {         return candidate in _db.candidates                (candidate.candidateskills.any(c => job.jobpreferredskills.any(j => j.skillid == c.skillid)))                select candidate;     }

then use all() second case (all skills have in preferred skills)

    public iqueryable<candidate> getmatchingcandidates(job job)     {         return candidate in _db.candidates                (candidate.candidateskills.all(c => job.jobpreferredskills.any(j => j.skillid == c.skillid)))                select candidate;     }

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