Linq query with nullable sum

Question

from i in Db.Items
select new VotedItem
{
    ItemId = i.ItemId,
    Points = (from v in Db.Votes
              where b.ItemId == v.ItemId
              select v.Poi         


        

Answer 1

Similar to previous answers, but you can also cast the result of the entire sum to the nullable type.

from i in Db.Items
select new VotedItem
{
    ItemId = i.ItemId,
    Points = (decimal?)((from v in Db.Votes
              where b.ItemId == v.ItemId
              select v.Points).Sum()) ?? 0
}

Arguably this better fits what is really going on but it has the same effect as the cast in this answer.