HttpWebRequest post 提交重复数据

Question

如图所示，我模拟小米登录，但是Post数据总是重复的，如何解决这个问题
这是我的代码private void aa(string url, string cookie, string post, Encoding encode)
        {
            byte[] bs = encode.GetBytes(post);
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.UserAgent = "Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20100101 Firefox/15.0";
            req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            req.Headers[HttpRequestHeader.AcceptEncoding] = "gzip, deflate";
            req.Headers[HttpRequestHeader.AcceptLanguage] = "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3";
            req.Referer = "https://account.xiaomi.com/pass/serviceLogin";            CookieContainer co = new CookieContainer();
            co.SetCookies(new Uri(url), cookie);
            req.CookieContainer = co;            req.ContentLength = bs.Length;            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(bs, 0, bs.Length);
            }
            using (WebResponse wr = req.GetResponse())
            {
                //在这里对接收到的页面内容进行处理
                string setCookie = wr.Headers[HttpResponseHeader.SetCookie];
                MessageBox.Show(setCookie);
            }
        }

Answer 1

我用HttpWebRequest Post提交数据时，账号和密码只写的一次
但是抓取显示的是两次  
 string post = "passToken=&user=********&pwd=*********&callback=https%3A%2F%2Faccount.xiaomi.com&sid=passport&hidden=";这个是我传递过去的Post

Answer 2

    public class HttpHelper
    {
        public static string contentType = "application/x-www-form-urlencoded";
        public static string accept = "text/html, application/xhtml+xml, */*";
        public static string userAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; BOIE9;ZHCN)";
        public static string referer = string.Empty;        /// <summary>
        /// 获取字符流
        /// </summary>
        /// <param name="url"></param>
        /// <param name="cookieContainer"></param>
        /// <returns></returns>
        public static Stream GetStream(string url, CookieContainer cookieContainer)
        {
            HttpWebRequest httpWebRequest = null;
            HttpWebResponse httpWebResponse = null;            try
            {
                httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
                httpWebRequest.CookieContainer = cookieContainer;
                httpWebRequest.ContentType = contentType;
                httpWebRequest.Referer = referer;
                httpWebRequest.Accept = accept;
                httpWebRequest.UserAgent = userAgent;
                httpWebRequest.Method = "GET";
                httpWebRequest.ServicePoint.ConnectionLimit = int.MaxValue;                httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                Stream responseStream = httpWebResponse.GetResponseStream();                return responseStream;
            }
            catch (Exception)
            {
                return null;
            }
        }        /// <summary>
        /// 获取HTML
        /// </summary>
        /// <param name="url"></param>
        /// <param name="cookieContainer"></param>
        /// <param name="method">GET or POST</param>
        /// <param name="postData">like "username=admin&password=123"</param>
        /// <returns></returns>
        public static string GetHtml(string url, CookieContainer cookieContainer = null, string method = "GET", string postData = "")
        {
            cookieContainer = cookieContainer ?? new CookieContainer();            HttpWebRequest httpWebRequest = null;
            HttpWebResponse httpWebResponse = null;            try
            {
                httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
                httpWebRequest.CookieContainer = cookieContainer;
                httpWebRequest.ContentType = contentType;
                httpWebRequest.Referer = referer;
                httpWebRequest.Accept = accept;
                httpWebRequest.UserAgent = userAgent;
                httpWebRequest.Method = method;
                httpWebRequest.ServicePoint.ConnectionLimit = int.MaxValue;
                httpWebRequest.AllowAutoRedirect = true;                if (method.ToUpper() == "POST")
                {
                    byte[] byteRequest = Encoding.UTF8.GetBytes(postData);
                    Stream stream = httpWebRequest.GetRequestStream();
                    stream.Write(byteRequest, 0, byteRequest.Length);
                    stream.Close();
                }                httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                Stream responseStream = httpWebResponse.GetResponseStream();
                StreamReader streamReader = new StreamReader(responseStream, Encoding.UTF8);
                string html = streamReader.ReadToEnd();                streamReader.Close();
                responseStream.Close();                httpWebRequest.Abort();
                httpWebResponse.Close();                return html;
            }
            catch (Exception)
            {
                return string.Empty;
            }
        }
    }
        static void Main(string[] args)
        {
            string result = HttpHelper.GetHtml("https://account.xiaomi.com/pass/serviceLoginAuth", null, "POST", "passToken=&user=*******@qq.com&pwd=dafsd3df3&callback=https%3A%2F%2Faccount.xiaomi.com&sid=passport&hidden=");
        }
我试了一下，一切正常。上面是我测试的代码。
其中注意设置：httpWebRequest.AllowAutoRedirect = true;
因为这处理登陆请求的时候url转发了3次，如果不设置自动重定向的话，自己就得处理多次。