/// <summary>

    /// 序列化JSON,返回string

    /// </summary>

    /// <param name="dt">传入DataTable</param>

    /// <param name="DateFormat">关于日期的格式,支持(yyyy-MM-dd)等</param>

    /// <returns></returns>

    private string SerializeJson(DataTable dt, string DateFormat)

    {

        List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();

        foreach (DataRow row in dt.Rows)

        {

            Dictionary<string, object> dict = new Dictionary<string, object>();

            foreach (DataColumn col in dt.Columns)

            {

                dict[col.ColumnName] = row[col];

            }

            list.Add(dict);

        }

        JavaScriptSerializer jss = new JavaScriptSerializer();

        string jsonstr = jss.Serialize(list);

        jsonstr = Regex.Replace(jsonstr, @"\\/Date\((\d+)\)\\/", match =>

        {

            DateTime adt = new DateTime(, , );

            adt = adt.AddMilliseconds(long.Parse(match.Groups[].Value));

            adt = adt.ToLocalTime();

            return adt.ToString(DateFormat);

        });

        return jsonstr;

    }

JObject obj = JObject.Parse(data);//序列化json对象

string openid = obj["openid"].ToString();