/// <summary>
        /// 线程轮训服务
        /// </summary>
        /// <param name="ws">要轮训的代码块</param>
        /// <param name="interval">间隔的秒数</param>
        /// <returns></returns>
        private string ThreadPoolService(Func<string> ws, Action<string> logger, params int[] interval)
        {
            string url = ws();
            foreach (int i in interval)
            {
                Thread.Sleep(i * 1000);
                url = ws();
                if (!string.IsNullOrWhiteSpace(url))
                {
                    logger(string.Format("点播轮训调用时间:{0}秒,发生的时间:{1}秒", i, DateTime.Now));
                    break;
                }
            }
            return url;
        }