ElementAt< TSource >() [1/2]

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

inlinestatic

Definition at line 4643 of file Enumerable.cs.

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

References System.Linq.count, System.Linq.index, System.Linq.source, System.Linq.ThrowHelper.ThrowArgumentNullException(), and System.Linq.ThrowHelper.ThrowArgumentOutOfRangeException().