Himall商城ExpressDaDaHelper 日期转换成unix时间戳、转换成字典、生成签名

 /// <summary>
        /// 日期转换成unix时间戳
        /// </summary>
        /// <param name="dateTime"></param>
        /// <returns></returns>
        public static long DateTimeToUnixTimestamp(DateTime dateTime)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return Convert.ToInt64((dateTime - startTime).TotalSeconds);
        }
        /// <summary>
        /// 转换成字典
        /// </summary>
        /// <param name="j"></param>
        /// <returns></returns>
        public static IDictionary<string, object> ToDictionary(JObject j)
        {
            var result = j.ToObject<Dictionary<string, object>>();

            var JObjectKeys = (from r in result