public IEnumerable <PermisoEntity> GetPermiRolList(int?IdRol) { if (WebOperationContext.Current.IncomingRequest.Method == "OPTIONS") { return(null); } else { try { return(Permiso.GetPermisoRolList(IdRol)); } catch (Exception ex) { throw new WebFaultException <string>(ex.Message, HttpStatusCode.ExpectationFailed); } } }