json序列化反序列化table

#region 序列化与反序列化的帮助类
    /// <summary>
    /// 序列化与反序列化的帮助类
    /// </summary>
    public class JsonHelper
    {
        #region 根据总条数和DataTable获得序列化的json字符串
        /// <summary>
        /// 根据总条数和DataTable获得序列化的json字符串
        /// </summary>
        /// <param name="recordCount">记录总条数</param>
        /// <param name="dt">数据DataTable</param>
        /// <returns></returns>
        public static string DataTableToJsonStr(int recordCount, DataTable dt)
        {
            if (dt == null || dt.Rows.Count <= 0)
            {
                return "{\"total\":0,\"rows\":[]}";
            }
            else
            {
                StringBuilder sb = new StringBuilder();
                sb.Append("{");
                sb.AppendFormat("\"{0}\":{1}", "total", recordCount.ToString());


                sb.Append(",\"rows\":[");
                foreach (DataRow dr in dt.Rows)
                {
                    sb.Append("{");