c# 解析json数据

      WebRequest req = WebRequest.Create("");
        req.Timeout = 300000;
        req.Headers.Set("Pragma", "no-cache");
        WebResponse res = req.GetResponse();
        Stream receiveStream = res.GetResponseStream();
        Encoding encode = Encoding.GetEncoding("utf-8");
        StreamReader sr = new StreamReader(receiveStream, encode);
        JavaScriptSerializer jsSer = new JavaScriptSerializer();

        string str = sr.ReadToEnd();
        List<Object> jo = jsSer.Deserialize<List<Object>>(str);
        for (int i = 0; i < jo.Count; i++)
        {
            System.Collections.Generic.Dictionary<string, object> oo = (Dictionary<string, object>)(jo[i]);
            string str11 = (string)(oo["1"]);
        }