ElementAtOrDefault< TSource >() [1/2]

static ? TSource System.Linq.Enumerable.ElementAtOrDefault< TSource > ( this IEnumerable< TSource > source, Index index )

inlinestatic

Definition at line 4687 of file Enumerable.cs.

    {
        if (source == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.source);
        }
        if (!index.IsFromEnd)
        {
            return source.ElementAtOrDefault(index.Value);
        }
        if (source.TryGetNonEnumeratedCount(out var count))
        {
            return source.ElementAtOrDefault(count - index.Value);
        }
        TryGetElementFromEnd<TSource>(source, index.Value, out var element);
        return element;
    }

References System.Linq.count, System.Linq.index, System.Linq.source, System.Linq.ThrowHelper.ThrowArgumentNullException(), and System.Linq.Enumerable.TryGetElementFromEnd< TSource >().