/// <summary>
        /// 首页获取砍价产品列表
        /// </summary>
        /// <param name="pageIndex"></param>
        /// <param name="pageSize"></param>
        /// <returns></returns>
        public async Task <OperationResult <PagedModel <BargainProductItem> > > SelectBargainProductListAsync(int pageIndex,
                                                                                                              int pageSize)
        {
            if (pageIndex < 1 || pageSize < 1)
            {
                return(OperationResult.FromError <PagedModel <BargainProductItem> >(ErrorCode.ParameterError, "参数不正确"));
            }
            var result = await BargainManager.SelectBargainProductList(pageIndex, pageSize);

            return(OperationResult.FromResult(result));
        }