如何使用HttpWebRequest在登录后从Web提取数据

Question

我正在尝试从登录中提取数据，以便我能够验证登录是否成功。

如何使用HttpWebRequest提取页面内容，以便我可以使用它来验证登录是否正常。

由于每次登录返回状态代码200，如果登录正确且不正确，则会更难验证成功登录。

private int[] LoginCheck(string TargetWebApp)
        {
            int[] result = new int[2];
            var watch = System.Diagnostics.Stopwatch.StartNew();
            try
            {


                string formUrl = "https://someweb/user/login/default";
                string formParams = string.Format("email={0}&password={1}&submit=Login", "someuser@somedomain.com", "somepassword");
                string cookieHeader;
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(formUrl);
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
                req.ContentType = "application/x-www-form-urlencoded";
                req.Method = "POST";
                byte[] bytes = Encoding.ASCII.GetBytes(formParams);
                req.ContentLength = bytes.Length;
                using (Stream os = req.GetRequestStream())
                {
                    os.Write(bytes, 0, bytes.Length);
                }
                HttpWebResponse resp = req.GetResponse() as HttpWebResponse;

                var elapsedMs = watch.ElapsedMilliseconds;
                watch.Stop();
                var isInvalidAccess = resp.StatusCode == HttpStatusCode.Unauthorized;
                Console.WriteLine("Login to something succeed in {0} Milliseconds", elapsedMs);
                cookieHeader = resp.Headers["Set-cookie"];
                result[0] = 1;
                result[1] = (int)elapsedMs;

            }
            catch (Exception e)
            {
                //Any exception will return false.
                Console.WriteLine(e.Message);
                result[0] = 0;
                result[1] = 0;
            }

            return result;
        }