POST信息模擬登錄獲取頁面內容

最近項目里有一個是要模擬登錄后，訪問固定頁面獲取內容的要求，一開始用JQ Ajax好像不支持跨域請求。后使用.net中HttpWebRequest對象來獲取。一開始訪問總是無法在第二個頁面正常訪問,好像沒通過登錄驗證，用postman模擬提交正常，后查詢出原是忘記在第二次請求沒把cookies關聯上，關聯上后請求正常。

            string wurl="";                       string username="haxinet";            string userpwd="haxinet";            CookieContainer cookies = new CookieContainer();            Encoding encode = System.Text.Encoding.UTF8;            byte[] arrB = encode.GetBytes("user_name=" + username + "&user_passwd=" + userpwd + "&keepuser=1");                    System.Net.HttpWebRequest myReq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(wurl);            myReq.Method = "POST";            myReq.ContentType = "application/x-www-form-urlencoded";            myReq.ContentLength = arrB.Length;            myReq.CookieContainer = cookies;            Stream outStream = myReq.GetRequestStream();            outStream.Write(arrB, 0, arrB.Length);            outStream.Close();            System.Net.WebResponse myResp = null;            try            {                myResp = myReq.GetResponse();            }            catch (Exception e)            {                          }            Stream ReceiveStream = myResp.GetResponseStream();            StreamReader readStream = new StreamReader(ReceiveStream, encode);            Char[] read = new Char[256];            int count = readStream.Read(read, 0, 256);            string str = null;            while (count > 0)            {                str += new String(read, 0, count);                count = readStream.Read(read, 0, 256);            }            readStream.Close();            myResp.Close();            string wuurl = "";            HttpWebRequest myReq2 = (HttpWebRequest)HttpWebRequest.Create(wuurl);            myReq2.Method = "GET";            myReq2.CookieContainer = cookies;            using (WebResponse wr = myReq2.GetResponse())            {                StreamReader reader = new StreamReader(wr.GetResponseStream(), Encoding.UTF8);                string result = reader.ReadToEnd();                retStr = result;            }