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

I think this is the same case. I resolved it. This is my solution:

var x = (from a in this.db.Pohybs
                 let sum = (from p in a.Pohybs
                            where p.PohybTyp.Vydej == true
                            select p.PocetJednotek).Sum()
                 where a.IDDil == IDDil && a.PohybTyp.Vydej == false
                 && ( ((int?)sum??0) < a.PocetJednotek)
                 select a);

I hope this help.

Answer 2

If you don't like casting to nullabe decimal you could also try using Linq To Objects with ToList() method,

LinqToObjects Sum of empty collection is 0, where LinqToSql Sum of empty collection is null.