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Sum throws 'Value cannot be null' error on linq query.

Description

Linq query fails when trying to sum a decimal: session.Query<Payment>().Where(x => x.Customer.Id == 4).Sum(x => x.Amount);

.NET version 4, SQL server 2008

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Oskar Berggren 
March 6, 2013 at 9:09 AM

The question is not how to implement it, but if it's a good idea or not. I closed the bug with the reasoning that we should follow the semantics of L2SQL and L2EF. Now I think there are rumors that the behavior on L2EF might be changed to return 0 when there are no matching rows. If that's true maybe we should reopen.

Really, "var sum = myQuery.Sum(x => (int?)x.Prop) ?? 0" is a decent workaround for now.

Anish Patel 
March 6, 2013 at 8:52 AM

how about the option to use the ?? coalesce, which could be converted to ISNULL() is SQL?

Oskar Berggren 
March 5, 2013 at 6:19 PM

Please read at least my comments from october and november 2012 above.

Anish Patel 
March 5, 2013 at 5:30 PM

why won't this be fixed?

Oskar Berggren 
November 11, 2012 at 9:39 PM

Due to now clean and easy way to solve this robustly, the current behavior, which matches L2SQL and L2EF will remain for now. Closing as won't fix.

Won't Fix

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Created April 10, 2012 at 11:34 AM
Updated March 6, 2013 at 9:09 AM
Resolved November 11, 2012 at 9:39 PM
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