C# winform实现网页登陆的问题（在线急等，解决马上给分，100%结贴率）

Question

此问题困扰两天了，郁闷得很，直接贴代码吧：
 public CookieContainer Get_Login()
        {
            CookieContainer cc = new CookieContainer();
            string FormURL = "http://localhost:1070/WebSite3/Login.aspx";                //处理表单的绝对URL地址
            string FormData = "UserName=wq&Password=1";    //表单需要提交的参数，注意改为你已注册的信息。
            byte[] data = Encoding.UTF8.GetBytes(FormData);            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(FormURL);
            request.Method = "POST";    //数据提交方式
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; TencentTraveler 4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; CIBA)";
            //模拟一个UserAgent
            Stream newStream = request.GetRequestStream();
            newStream.Write(data, 0, data.Length);            newStream.Close();            request.CookieContainer = cc;            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            cc.Add(response.Cookies);
            Stream stream = response.GetResponseStream();
            string WebContent = new StreamReader(stream, System.Text.Encoding.UTF8).ReadToEnd();
            return cc;
        }private void btnSubmit_Click(object sender, EventArgs e)
        {
            CookieContainer cc = new CookieContainer();
            cc = Get_Login();            //获取登录Cookies            string PhotoClassURL = "http://localhost:1070/WebSite3/Default.aspx";
            HttpWebRequest Myrequest = (HttpWebRequest)WebRequest.Create(PhotoClassURL);
            Myrequest.CookieContainer = cc;
            HttpWebResponse Myresponse = (HttpWebResponse)Myrequest.GetResponse();
            cc.Add(Myresponse.Cookies);
            Stream Mystream = Myresponse.GetResponseStream();
            string sHtml = new StreamReader(Mystream, System.Text.Encoding.UTF8).ReadToEnd();
            txtSource.Text = sHtml;
        }
cc = Get_Login(); 获取的cook数量总是为0，也就是没获取到不知道怎么回事   在Default.aspx页面中代码如下：
protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["UserName"] == null)
        {
            Response.Redirect("Login.aspx");
            return;
        }        if ((string)Session["UserName"] == string.Empty)
        {
            Response.Redirect("Login.aspx");
        }
    }
在Default.aspx页面中代码如下：
protected void btnSumbmit_Click(object sender, EventArgs e)
    {
        SqlConnection conn = new SqlConnection("Data Source=.;database=LifeList;uid=sa;pwd=852527");
        SqlCommand cmd =
            new SqlCommand("select count(*) from tblUser where UserName='" + txtUserName.Text + "' and Password='" +
                           txtPassword.Text + "'", conn);
        conn.Open();
        if (Convert.ToInt32(cmd.ExecuteScalar()) == 1)
        {
            Session["UserName"] = "wq";
            Response.Redirect("Default.aspx");
        }
    }
      
请教达人为什么取不到default.aspx的具体内容啊，登陆获取cookie那段是不是有问题，头都大了，谢谢  

Answer 1

c# 网页登陆？
可以考虑用webservice啊，实现BS和CS的数据交互。

Answer 2

不想用webserviece，就是想通过post方式实现

Answer 3

你看到你把信息写到Cookie里去啊，哪段代码？

Answer 4

通过public CookieContainer Get_Login()这个方法啊获取cookie

Answer 5

Get_Login()这个方法是在客户端，你服务器上的代码有写入Cookie吗？如果服务器没有写入，客户端当然没有接收到了

Answer 6

呃确实是这么回事，没写
那要怎么做才可以突破这个登录，获取default.aspx源码？
if (Session["UserName"] == null)
        {
            Response.Redirect("Login.aspx");
            return;
        }
是这个造成的吧，请教

Answer 7

通过抓包工具可以等到如下信息：
GET /WebSite3/Default.aspx HTTP/1.1
Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/x-silverlight, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, */*
Referer: http://localhost:1070/WebSite3/Login.aspx
Accept-Language: zh-cn
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; TencentTraveler 4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; CIBA)
Accept-Encoding: gzip, deflate
Host: localhost:1070
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: COOKIE=Language=2052; ASP.NET_SessionId=1m2s2tf0olvzs445v0h3fq45
为什么我获取不到这个cookie咧？

Answer 8

按道理是不是我获取到了
Cookie: COOKIE=Language=2052; ASP.NET_SessionId=1m2s2tf0olvzs445v0h3fq45，然后CookieContainer cc = new CookieContainer();
            cc = Get_Login();            //获取登录Cookies            string PhotoClassURL = "http://localhost:1070/WebSite3/Default.aspx";
            HttpWebRequest Myrequest = (HttpWebRequest)WebRequest.Create(PhotoClassURL);
            Myrequest.CookieContainer = cc;
访问defalut.aspx页面时就可以得到default.aspx页面的源码？

Answer 9

 public string Post(string url, string strPost, RequestPPT rePpt, string coding)//string user, string password, string checkcode
        {
            string outHtml = "";
            try
            {
                byte[] data = Encoding.Default.GetBytes(strPost);
                HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
                myRequest.Method = rePpt.Method;
                myRequest.ContentType = rePpt.ContentType;
                myRequest.CookieContainer = CookieCtainer;
                myRequest.Referer = rePpt.Referer;
                myRequest.ContentLength = data.Length;
                Stream newStream = myRequest.GetRequestStream();
                // Send the data.   
                newStream.Write(data, 0, data.Length);
                newStream.Close();                // Get response   
                HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
                myResponse.Cookies = CookieCtion;
                StreamReader reader;
                if(coding == "UTF8")
                    reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
                else
                    reader = new StreamReader(myResponse.GetResponseStream(), Encoding.Default);
                outHtml = reader.ReadToEnd();
                return outHtml;
            }
            catch (Exception ee)
            {
                outHtml = ee.Message;
                return outHtml;
                // MessageBox.Show(ee.Message);return outHtml;
            }
        }
            rppt.Method = "POST";
            rppt.Referer = "http://www.paynewline.com/";
            rppt.Accept = " image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*";
            rppt.ContentType = "application/x-www-form-urlencoded";
            rppt.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)";
            html = httpwebclient.Post("http://www.paynewline.com/business/sh_login.do", "dlip=&showmsg=null&dlfs=2&dlm=" + username + "&password=" + password + "&dynamicPwd=&imgnum=" + image, rppt, "UTF8");
          

Answer 10

获得cookies
public void SetCookieContainer(CookieCollection CookieCC)
        {
            CookieCtainer.Add(CookieCC);
        }
        public void SetCookieCollection(CookieCollection CookieCC)
        {
            CookieCtion=CookieCC;
        }public string Post(string url, string strPost, RequestPPT rePpt, string coding)//string user, string password, string checkcode 
        { 
            string outHtml = ""; 
            try 
            { 
                byte[] data = Encoding.Default.GetBytes(strPost); 
                HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url); 
                myRequest.Method = rePpt.Method; 
                myRequest.ContentType = rePpt.ContentType; 
                myRequest.CookieContainer = CookieCtainer; 
                myRequest.Referer = rePpt.Referer; 
                myRequest.ContentLength = data.Length; 
                Stream newStream = myRequest.GetRequestStream(); 
                // Send the data.  
                newStream.Write(data, 0, data.Length); 
                newStream.Close();                 // Get response  
                HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); 
                myResponse.Cookies = CookieCtion; 
                StreamReader reader; 
                if(coding == "UTF8") 
                    reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8); 
                else 
                    reader = new StreamReader(myResponse.GetResponseStream(), Encoding.Default); 
                outHtml = reader.ReadToEnd(); 
                return outHtml; 
            } 
            catch (Exception ee) 
            { 
                outHtml = ee.Message; 
                return outHtml; 
                // MessageBox.Show(ee.Message);return outHtml; 
            } 
        }  public string GetCookieContainer(string url)//string user, string password, string checkcode
        {
            string outHtml = "";            try
            {
                HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
                req.Method = "GET";
                req.CookieContainer = CookieCtainer;
                HttpWebResponse wr = (HttpWebResponse)req.GetResponse();                StreamReader readwr = new StreamReader(wr.GetResponseStream(), Encoding.Default);
                outHtml = readwr.ReadToEnd();
                SetCookieCollection(wr.Cookies);
                SetCookieContainer(wr.Cookies);
                return outHtml;
            }
            catch (Exception ee)
            {
                outHtml = ee.Message;
                return outHtml;
            }
        }httpwebclient.GetCookieContainer("http://www.paynewline.com/");这样先得到COOKIES
                     rppt.Method = "POST";
            rppt.Referer = "http://www.paynewline.com/";
            rppt.Accept = " image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*";
            rppt.ContentType = "application/x-www-form-urlencoded";
            rppt.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)";
            html = httpwebclient.Post("http://www.paynewline.com/business/sh_login.do", "dlip=&showmsg=null&dlfs=2&dlm=" + username + "&password=" + password + "&dynamicPwd=&imgnum=" + image, rppt, "UTF8");
       

Answer 11

听了一个前辈的方法，问题解决了，
string formatString ="__VIEWSTATE={0}&txtUsername={1}&txtPassword={2}&btnSubmit={3}&__EVENTVALIDATION={4}";
string postString = string.Format(formatString, viewState, txtUsername, txtPassword,
 btnSubmit, eventValidation);
但还是有点不明白，为什么一定要__VIEWSTATE，__EVENTVALIDATION等等，请大虾指教

Answer 12

我找到一个很好的http抓包工具叫http watch，很好用，能够把post所需数据一一捕获，很好
用