The rights of all persons furnishing labor, services, equipment, or materials for any work of improvement, with respect to any fund for payment of construction costs, are governed exclusively by Chapters 3 (commencing with Section 3156) and 4 (commencing with Section 3179) of this title, and no person may assert any legal or equitable right with respect to such fund, other than a right created by direct written contract between such person and the person holding the fund, except pursuant to the provisions of such chapters.
