Boris Callens
Reputation: 93287
Return null for FirstOrDefault() on empty IEnumerable<int>?
Say I have the following snippet:
int? nullableId = GetNonNullableInts().FirstOrDefault();
Because GetNonNullableInts() returns integers, the FirstOrDefault will default to 0.
Is there a way to make the FirstOrDefault on a list of integers return a null value when the list is empty?
Upvotes: 34
Views: 23338
Answers (2)
Rubens Farias
Reputation: 57936
FirstOrDefault depends on T from IEnumerable<T> to know what type to return, that's why you're receiving int instead int?.
So you'll need to cast your items to int? before return any value, just like Matt said
Upvotes: 1
Matt Howells
Reputation: 41266
int? nullableId = GetNonNullableInts().Cast<int?>().FirstOrDefault();
Upvotes: 61
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