/// <summary>
        /// Json.net默认转换设置
        /// </summary>
        private static void DefaultJsonConvertSetting()
        {
            JsonSerializerSettings setting = new JsonSerializerSettings();
            JsonConvert.DefaultSettings = new Func<JsonSerializerSettings>(() =>
            {
                //日期类型默认格式化处理
                setting.DateFormatHandling = DateFormatHandling.MicrosoftDateFormat;
                setting.DateFormatString = "yyyy-MM-dd HH:mm:ss";

                //空值处理
                //setting.NullValueHandling = NullValueHandling.Ignore;

                return setting;
            });
        }