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Does LINQ query return null?
LINQ queries should never return null and you should not get an exception if the result is empty.
Does LINQ where return null or empty list?
7 Answers. It will return an empty enumerable. It wont be null.
Can ToList () return null?
toList() will return an empty ArrayList . That said, there’s no reason someone couldn’t use a weird Collector to return null in certain circumstances: . of( ArrayList::new, ArrayList::add, (a, b) -> { a.
How do I get first or default in Linq?
Use the FirstorDefault() method to return the first element of a sequence or a default value if element isn’t there. List val = new List { }; Now, we cannot display the first element, since it is an empty collection.
Which is faster find or FirstOrDefault?
Find() runs almost as twice as faster, hoping . Net team will not mark it Obsolete in the future.
Can you return NULL for an empty list in LINQ?
The query ” SELECT SUM ( [Amount]) ” will return NULL for empty list. But if you use LINQ it expects that the ” Sum (l => l.Amount) ” returns double and it doesn’t allow you to use ” ?? ” operator to set 0 for empty collection.
Is it better to return NULL or empty object?
It returns null if the LINQ query returns an empty result set. Is this “correct”. Is it better to return an empty object? If so then how can I do that?
When to use string.isnullorempty in LINQ to SQL?
Proposed Solution Allow string.IsNullOrEmpty in a LINQ to SQL where clause so that these two queries have the same result: 1. DevArt 2. Dervalp.com 3. StackOverflow Post This won’t fail on Linq2Objects, but it will fail for Linq2SQL, so I am assuming that you are talking about the SQL provider or something similar.
When do database queries return an empty set?
Database queries return result sets. An empty set is a reasonable answer; it means you don’t have any of the things searched for. I would argue that your code is going to far in canonicalization of the result.