public IActionResult Delete(string formulaId)
        {
            var dal = new FormulaDal();
            var p   = dal.Find(formulaId);

            if (p == null)
            {
                return(Json(new { state = "error", data = "找不到这一条数据" }));
            }

            try
            {
                dal.Remove(p);
                return(Json(new { state = "ok", data = 1 }));
            }
            catch (Exception ex)
            {
                return(Json(new { state = "error", data = ex.Message }));
            }
        }