CookieContainer cCurrent = new CookieContainer();

            Uri u = new Uri(url);

            cCurrent.Add(u, new Cookie("JSESSIONID", jsessionId));

            cCurrent.Add(u, new Cookie("logonUsername", "88882"));

            if (P3p != null)

            {

                cCurrent.Add(u, new Cookie("P3P", P3p));

            }

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            UTF8Encoding encoding = new UTF8Encoding();

            //ASCIIEncoding encoding = new ASCIIEncoding();



            byte[] data = encoding.GetBytes(postdata);//post 方式的编码                                



            request.Headers.Clear();

            request.Method = "POST";//必须为大写，不然会出错                        



            request.ContentType = "application/x-www-form-urlencoded";

            //request.ContentType = "text/html;charset=UTF-8";

            request.ContentLength = data.Length;

            request.KeepAlive = true;

            request.CookieContainer = cCurrent;

            request.Timeout = 3000;    //超时时间            

            //request.se



            //提交请求

            stream = request.GetRequestStream();

            stream.Write(data, 0, data.Length);

            stream.Close();



            //接收

            string result = "";            

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();           

            if (response.StatusCode != HttpStatusCode.OK)

                return "";



            //StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8"));

            //StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

            StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

            result = streamReader.ReadToEnd();

            request.Abort();

            response.Close();

            streamReader.Close();

sbParam = new StringBuilder();

            sbParam.Append("action=queryData");

            sbParam.Append("&activeName=");

            sbParam.Append("&alarm_time=");

            sbParam.Append("&appId=");

            sbParam.Append("&attemper_reason=");

            sbParam.Append("&backed_reason=");

            sbParam.Append("&backed_way=");

            sbParam.Append("&backedReasonCode=");

            sbParam.Append("&backedReasonName=");

            sbParam.Append("&backSteps=");

            sbParam.Append("&backType=");

            sbParam.Append("&due_time=1");

            sbParam.Append("&field1=");

            sbParam.Append("&isQuery=N");

            sbParam.Append("&isquerydata=N");

            sbParam.Append("&lockType=10");

            sbParam.Append("&overReason=");

            sbParam.Append("&postAllField={\"=\":{},\"@\":{lockType:\"10\"},\"Q\":{query:\"N\"}}");

            sbParam.Append("&postStr=");

            sbParam.Append("&processTitle=");

            sbParam.Append("&refreshCondition=Y");

            sbParam.Append("&scheduleSteps=");

            sbParam.Append("&sysUser=88882");

            sbParam.Append("&tabpage=main");

            sbParam.Append("&taskId=");

            sbParam.Append("&terminate_reason=");

            sbParam.Append("&viewCond=");

            sbParam.Append("&viewfield=");

            sbParam.Append("&viewStr=");

            sbParam.Append("&worklistPagination_colname=");

            sbParam.Append("&worklistPagination_pageno=1");

            sbParam.Append("&worklistPagination_pagesize=15");

            sbParam.Append("&worklistPagination_sid=null");

            sbParam.Append("&worklistPagination_sorttype=");