題
我使用此代碼登錄：
CookieCollection cookies = new CookieCollection();
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("example.com");
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(cookies);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
cookies = response.Cookies;
string getUrl = "example.com";
string postData = String.Format("my parameters");
HttpWebRequest getRequest = (HttpWebRequest)WebRequest.Create(getUrl);
getRequest.CookieContainer = new CookieContainer();
getRequest.CookieContainer.Add(cookies);
getRequest.Method = WebRequestMethods.Http.Post;
getRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0";
getRequest.AllowWriteStreamBuffering = true;
getRequest.ProtocolVersion = HttpVersion.Version11;
getRequest.AllowAutoRedirect = true;
getRequest.ContentType = "application/x-www-form-urlencoded";
byte[] byteArray = Encoding.ASCII.GetBytes(postData);
getRequest.ContentLength = byteArray.Length;
Stream newStream = getRequest.GetRequestStream();
newStream.Write(byteArray, 0, byteArray.Length);
newStream.Close();
HttpWebResponse getResponse = (HttpWebResponse)getRequest.GetResponse();
using (StreamReader sr = new StreamReader(getResponse.GetResponseStream(), Encoding.GetEncoding("windows-1251")))
{
doc.LoadHtml(sr.ReadToEnd());
webBrowser1.DocumentText = doc.DocumentNode.OuterHtml;
}
然後我想使用HtmlWeb（HtmlAgilityPack）或Webclient將HTML解析為HtmlDocument（HtmlAgilityPack）。
我的問題是，當我使用時：
WebClient wc = new WebClient();
webBrowser1.DocumentText = wc.DownloadString(site);
要么
doc = web.Load(site);
webBrowser1.DocumentText = doc.DocumentNode.OuterHtml;
登錄消失所以我想我必須以某種方式通過cookie ..任何建議？
一般承認的答案
檢查HtmlAgilityPack.HtmlDocument Cookies
以下是您正在尋找的示例（語法未經過100％測試，我只修改了一些我經常使用的類） ：
public class MyWebClient
{
//The cookies will be here.
private CookieContainer _cookies = new CookieContainer();
//In case you need to clear the cookies
public void ClearCookies() {
_cookies = new CookieContainer();
}
public HtmlDocument GetPage(string url) {
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "GET";
//Set more parameters here...
//...
//This is the important part.
request.CookieContainer = _cookies;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
var stream = response.GetResponseStream();
//When you get the response from the website, the cookies will be stored
//automatically in "_cookies".
using (var reader = new StreamReader(stream)) {
string html = reader.ReadToEnd();
var doc = new HtmlDocument();
doc.LoadHtml(html);
return doc;
}
}
}
以下是您使用它的方式：
var client = new MyWebClient();
HtmlDocument doc = client.GetPage("http://somepage.com");
//This request will be sent with the cookies obtained from the page
doc = client.GetPage("http://somepage.com/another-page");
注意：如果您還想使用POST方法，只需使用POST邏輯創建類似於GetPage的方法，重構類等。
熱門答案
這裡有一些建議： 將CookieContainer與WebClient類一起使用
但是，使用HttpWebRequest並在CookieContainer設置cookie可能更容易：
- HTTPWebRequest和CookieContainer
- http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.cookiecontainer.aspx
代碼看起來像這樣：
// Create a HttpWebRequest
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(getUrl);
// Create the cookie container and add a cookie
request.CookieContainer = new CookieContainer();
// Add all the cookies
foreach (Cookie cookie in response.Cookies)
{
request.CookieContainer.Add(cookie);
}
第二件事是您不需要再次下載該站點，因為您已經從Web響應中獲得了該站點，並且您將其保存在此處：
HttpWebResponse getResponse = (HttpWebResponse)getRequest.GetResponse();
using (StreamReader sr = new StreamReader(getResponse.GetResponseStream(), Encoding.GetEncoding("windows-1251")))
{
webBrowser1.DocumentText = doc.DocumentNode.OuterHtml;
}
您應該能夠只使用HTML並使用HTML Agility Pack解析它：
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(webBrowser1.DocumentText);
應該這樣做...... :)