Code inspection: Replace with OfType<T>().Single()

This inspection reports a LINQ query that casts elements with as and then uses Single(...) to find the only non-null cast result. The same intent is clearer with OfType<T>().Single().

Example

var item = items.Select(x => x as string).Single(y => y != null);

var item = items.OfType<string>().Single();

Quick-fix

Replace the Select(... as T).Single(y => y != null) pattern with OfType<T>().Single().

29 March 2026