Question

I have an Entity Framework object which represents a telephone call.

How can I group the dialed numbers by duration
and project that into { Number = xxx, DurationSum = yyy }

I’m a linq newbie and can’t seem to get it right.

Answer 1

I think you want something like:

var query = from call in db.Calls
            group call by call.Number into g
            select new { Number = g.Key, DurationSum = g.Sum(c => c.Duration) };