如何将Cookie传递到HtmlAgilityPack或WebClient？ [英] How to pass cookies to HtmlAgilityPack or WebClient?

问题描述

我使用此代码登录：

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;
}

然后我想使用HtmlWeb（HtmlAgilityPack）或Webclient来解析HTML HtmlDocument（HtmlAgilityPack）。

then I want to use HtmlWeb (HtmlAgilityPack) or Webclient to parse the HTML to HtmlDocument(HtmlAgilityPack).

我的问题是，当我使用：

My problem is that when I use:

WebClient wc = new WebClient();
webBrowser1.DocumentText = wc.DownloadString(site);

或

doc = web.Load(site);
webBrowser1.DocumentText = doc.DocumentNode.OuterHtml;

登录消失，所以我想我必须以某种方式通过cookies ..任何建议？

The login disappear so i think I must somehow pass the cookies.. Any suggestions?

推荐答案

检查 HtmlAgilityPack.HtmlDocument Cookie

这里是您正在寻找的示例（语法不是100％测试，我只是修改了一些我通常使用的类）：

Here is an example of what you're looking for (syntax not 100% tested, I just modified some class I usually use):

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;
        }
    }
}

：

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：如果您还想使用 POST 方法，只需使用 POST 逻辑创建类似于 GetPage 的方法，重构类等。

Note: If you also want to use POST method, just create a method similar to GetPage with the POST logic, refactor the class, etc.

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