我尝试在此站点上提交表单:freeclassifieds,使用支持 cookie 的 WebClient。我升级的 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);
}
}
}
但是当我尝试提交表单时,我只是被阻止并接收登录页面作为响应。我检查了登录页面中的 cookie 和字段,一切似乎都已调整好。为什么登录成功后收不到正确的页面?
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);
}