对接口参数进行加密调用接口获取信息

        /// <summary>
        /// 调用接口获取信息
        /// </summary>
        /// <param name="p_strID"></param>
        /// <returns></returns>
        public Dictionary<string, object> GetInformationService(string p_strID)
        {
            const string strUrl = "http://www.baidu.com/api/test.php?query=test&moudle=moudleName";
            WebServiceMethod webServiceMethod = new WebServiceMethod(strUrl, "");
            Dictionary<string, string> dataDic = new Dictionary<string, string>();
            dataDic.Add("id", p_strID);
            var dataJson = (new JavaScriptSerializer()).Serialize(dataDic);
            string secretSign = WebServiceMethod.ConvertJsonToSecretSign(dataJson);
            string queryString = "data=" + dataJson + "&secSign=" + secretSign;
            var response = webServiceMethod.PostRequest(queryString);
            Dictionary<string, object> jsonDesToDic = webServiceMethod.ConvertValueAddResponseToObject(response);
            return jsonDesToDic;
        }

WebServiceMethod类

 //加密方式
......
//查询
public HttpWebResponse PostRequest(string strRequestParams)
   {
    //建立HttpWebRequest
       HttpWebRequest req = (HttpWebRequest)WebRequest.Create(this.WebRequestURL); 
       //定义网关
       if (Proxy != "")
       {
           WebProxy objProxy = new WebProxy(this.Proxy);   
           req.Proxy = objProxy;
       }
       req.Accept = "application/xml";
       req.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
       req.KeepAlive = false;
       req.Method = "POST";
       if (req.Method == "POST")
       {
           byte[] b = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(strRequestParams);
           req.ContentLength = b.Length;
           try
           {
               Stream oSRe = req.GetRequestStream();
               //添加接口参数到流
               oSRe.Write(b, 0, b.Length);
               oSRe.Close();
               oSRe = null;
           }
           catch (Exception)
           {
               req = null;
               return null;
           }

       }
       HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();
       return myResponse;
   }