Func<TEntity, bool>匿名委托

        /// <summary>
        /// 分页2
        /// </summary>
        /// <param name="current"></param>
        /// <param name="pageSize"></param>
        /// <param name="total"></param>
        /// <param name="productIds"></param>
        /// <param name="countryIds"></param>
        /// <returns></returns>
        public List<ProdCountry> ListEntities(int current, int pageSize, out int total, Func<ProdCountry, bool> func)
        {
            List<ProdCountry> list = ReadRedis();
            if (list == null || list.Count <= 0)
            {
                list = ReadDatabase();
            }
            var query = list.AsQueryable().Where(func);
            total = query.Count();

            return query.Skip((current - 1) * pageSize).Take(pageSize).ToList();
        }

var dd = new Func<ProdCountry, bool>(delegate (ProdCountry obj) { return obj.CountryId > 0; });