C# DataTable转json 时间格式化

1.NewTonSoft.json

 public static string DataTableToJson(DataTable dt)
        {
            if (dt == null && dt.Rows.Count <= 0)
            {
                return "";
            }
            else
            {
                IsoDateTimeConverter convert = new IsoDateTimeConverter();
                convert.DateTimeFormat = "yyyy-MM-dd HH:mm:ss";
                return JsonConvert.SerializeObject(dt, Formatting.None, convert);

            }
              
        }

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