Are ternary operators not valid for linq-to-sql queries?
- by KallDrexx
I am trying to display a nullable date time in my JSON response. In my MVC Controller I am running the following query:
var requests =
(from r in _context.TestRequests
where r.scheduled_time == null && r.TestRequestRuns.Count > 0
select new
{
id = r.id,
name = r.name,
start = DateAndTimeDisplayString(r.TestRequestRuns.First().start_dt),
end = r.TestRequestRuns.First().end_dt.HasValue
? DateAndTimeDisplayString(r.TestRequestRuns.First().end_dt.Value)
: string.Empty
});
When I run requests.ToArray() I get the following exception:
Could not translate expression '
Table(TestRequest)
.Where(r =>
((r.scheduled_time == null) AndAlso (r.TestRequestRuns.Count > 0)))
.Select(r => new <>f__AnonymousType18`4(id = r.id, name = r.name,
start = value(QAWebTools.Controllers.TestRequestsController).
DateAndTimeDisplayString(r.TestRequestRuns.First().start_dt),
end = IIF(r.TestRequestRuns.First().end_dt.HasValue,
value(QAWebTools.Controllers.TestRequestsController).
DateAndTimeDisplayString(r.TestRequestRuns.First().end_dt.Value),
Invoke(value(System.Func`1[System.String])))))'
into SQL and could not treat it as a local expression.
If I comment out the end = line, everything seems to run correctly, so it doesn't seem to be the use of my local DateAndTimeDisplayString method, so the only thing I can think of is Linq to Sql doesn't like Ternary operators? I think I've used ternary operators before, but I can't remember if I did it in this code base or another code base (that uses EF4 instead of L2S).
Is this true, or am I missing some other issue?
