Search for ancestors in a hierarchical list

Question

Created a method to search for children in a hierarchical list. Is there a way to do the method over the stack?

public static IEnumerable<T> GetSelfAndAncestors<T>(this T item, Func<T, T> parentSelector)
{
    var parent = parentSelector(item);
    if (parent==null)
        return item.ToIEnumerable();

    return item.ToIEnumerable().Concat(parent.GetSelfAndAncestors(parentSelector));
}