I tried to submit form on this site: freeclassifieds , using WebClient that support cookies. My upgraded WebClient:
public class CookieWebClient : WebClient
{
private readonly CookieContainer container = new CookieContainer();
public CookieWebClient(CookieContainer container)
{
this.container = container;
}
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest res = base.GetWebRequest(address);
var request = res as HttpWebRequest;
if (request != null)
{
request.CookieContainer = container;
}
return res;
}
protected override WebResponse GetWebResponse(WebRequest request, IAsyncResult result)
{
WebResponse response = base.GetWebResponse(request, result);
ReadCookies(response);
return response;
}
protected override WebResponse GetWebResponse(WebRequest request)
{
WebResponse response = base.GetWebResponse(request);
ReadCookies(response);
return response;
}
private void ReadCookies(WebResponse r)
{
var response = r as HttpWebResponse;
if (response != null)
{
CookieCollection cookies = response.Cookies;
container.Add(cookies);
}
}
}
But when I'm trying to submit form, I just get blocked and receiving the login page as a response. I checked the cookies and the fields in the login page, everything seems to be tuned up. Why can't I receive the right page after success login?
static void Main(string[] args)
{
string link1 = "http://www.freeclassifieds.com/logon.aspx";
string fileName= @"D:\Dropbox\myProjects\AutoPostMachine\myHtml.html";
CookieWebClient wc = new CookieWebClient(new CookieContainer());
NameValueCollection postDataCollection= new NameValueCollection();
postDataCollection.Add("ctl00$phMain$txtEmail", "myEmail");
postDataCollection.Add("ctl00$phMain$txtPassword","myPassword");
postDataCollection.Add("ctl00$phMain$btnLogin","Login");
wc.Encoding = Encoding.UTF8;
wc.Credentials = CredentialCache.DefaultCredentials;
wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
wc.Headers[HttpRequestHeader.Cookie] = "ASP.NET_SessionId=mfqdx1505nnbw3bxws01so12; __utma=19755559.732186057.1355692154.1355692154.1355695835.2; __utmb=19755559.3.10.1355695835; __utmc=19755559; __utmz=19755559.1355692154.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)";
byte[] byteArr= wc.UploadValues(link1, postDataCollection);
FileStream fs = new FileStream(fileName, FileMode.Create);
fs.Write(byteArr, 0, byteArr.Length);
Process.Start(fileName);
}
如果/配置正确,则不能“欺骗” ASP.Net Web窗体Postback
VIEWSTATE
参考: VIEWSTATE
和EVENTVALIDATION
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