Linq In Clause & Predicate building
- by Michael G
I have two tables. Report and ReportData.
ReportData has a constraint ReportID.
How can I write my linq query to return all Report objects where the predicate conditions are met for ReportData? Something like this in SQL:
SELECT * FROM Report as r
Where r.ServiceID = 3 and r.ReportID IN (Select ReportID FROM ReportData WHERE JobID LIKE 'Something%')
This is how I'm building my predicate:
Expression<Func<ReportData, bool>> predicate = PredicateBuilder.True<ReportData>();
predicate = predicate.And(x => x.JobID.StartsWith(QueryConfig.Instance.DataStreamName));
var q = engine.GetReports(predicate, reportsDataContext);
reports = q.ToList();
This is my query construction at the moment:
public override IQueryable<Report> GetReports(Expression<Func<ReportData, bool>> predicate, LLReportsDataContext reportDC)
{
if (reportDC == null) throw new ArgumentNullException("reportDC");
var q = reportDC.ReportDatas.Where(predicate).Where(r => r.ServiceID.Equals(1)).Select(r => r.Report);
return q;
}
