c# NullReferenceException in linq query

Question

In my code:

decimal maxPrice = list.Max(i => i.price);

Getting error - Object reference not set to an instance of an object. NullReferenceException was unhandled by code.

The i value becomes null, though the list count is 6709. How do I resolve this?

I tried but now it give me another error - Collection was modified; enumeration operation may not execute. — user1254053, Jun 21 '17 at 14:08
hm, are you using some threads/async's? This error occurs only when list modified from another thread. — Green_Wizard, Jun 21 '17 at 14:18

score 2 · Answer 1 · answered Jun 21 '17 at 14:02

2

So your list contains nulls.

Either filter them: list.Where(l => l != null).Max(...), or prevent the nulls to end up in the list in the first place.

answered Jun 21 '17 at 14:02

CodeCaster

4

Why not close this as duplicate? – Panagiotis Kanavos Jun 21 '17 at 14:02
1

Because I'm tired of setting a good example when other 100K+ rep users don't seem to care either and post answers to questions they _have_ to know to be duplicate. – CodeCaster Jun 21 '17 at 14:04
I know its extremely annoying, but sometimes there are *so many duplicates!*. – Panagiotis Kanavos Jun 21 '17 at 14:06

1 Answers1