Entity Framework 多對多查詢的寫法

同窗們,看下面的代碼段就明白了:

一對多:

public ICollection<ReportLookup> GetReportLookup(IEnumerable<Guid> specialityID)
{
var list = _Repo.All(p => specialityID.Contains(p.Speciality.Id)).ToList();
return list;
}

多對一:

public ICollection<ReportLookup> GetReportLookup(Guid specialityID)
{
var list = _Repo.All(p => p.Specialitys.Contains(specialityID)).ToList();
return list;
}

多對多:

public ICollection<ReportLookup> GetReportLookup(IEnumerable<Guid> specialityID)
{
var list = _Repo.All(p =>  p.Specialitys.Any(x => specialityID.Contains(x.Id))).ToList();
return list;
}