[ACCEPTED]-Return null for FirstOrDefault() on empty IEnumerable<int>?-linq
Accepted answer
int? nullableId = GetNonNullableInts().Cast<int?>().FirstOrDefault();
0
FirstOrDefault depends on T from IEnumerable<T> to know what type to 3 return, that's why you're receiving int instead 2 int?.
So you'll need to cast your items to int? before 1 return any value, just like Matt said
Source:
stackoverflow.com
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