public ActionResult PorContrato(int id) { if (id == 0) { return(RedirectToAction(nameof(Index))); } else { IList <Pago> lista = repositorio.ObtenerPorContrato(id); Contrato c = repositorioContrato.Obtener(id); if (c == null) { return(RedirectToAction(nameof(Index))); } ViewBag.Contrato = c; return(View("Index", lista)); } }