/// <summary>
        /// 将参数值序列化为json文本
        /// </summary>
        /// <param name="obj">对象</param>
        /// <param name="encoding">编码</param>
        /// <returns></returns>
        public string Serialize(object obj, Encoding encoding)
        {
            if (obj == null)
            {
                return(null);
            }

            var dateTimeFormate = "yyyy-MM-dd HH:mm:ss";

#if NET45
            if (JsonNet.IsSupported == true)
            {
                return(JsonNet.SerializeObject(obj));
            }
            return(JSON.Serialize(obj, dateTimeFormate));
#endif
#if NETCOREAPP2_0
            var setting = new JsonSerializerSettings {
                DateFormatString = dateTimeFormate
            };
            return(JsonConvert.SerializeObject(obj, setting));
#endif
        }