HtmlAgilityPack和身份验证

本文关键字:身份验证 HtmlAgilityPack | 更新日期: 2023-09-27 18:00:16

如果给定一个特定的url,我有一个获取id和xpath的方法。我如何在请求中输入用户名和密码,以便刮取需要用户名和密码的url?

using HtmlAgilityPack;
_web = new HtmlWeb();
internal Dictionary<string, string> GetidsAndXPaths(string url)
{
    var webidsAndXPaths = new Dictionary<string, string>();
    var doc = _web.Load(url);
    var nodes = doc.DocumentNode.SelectNodes("//*[@id]");
    if (nodes == null) return webidsAndXPaths;
    // code to get all the xpaths and ids

我应该使用web请求来获取页面源,然后将该文件传递到上面的方法中吗?

var wc = new WebClient();
wc.Credentials = new NetworkCredential("UserName", "Password");
wc.DownloadFile("http://somewebsite.com/page.aspx", @"C:'localfile.html");

HtmlAgilityPack和身份验证

HtmlWeb.Load有许多重载,它们接受NetworkCredential的实例,或者您可以直接传入用户名和密码。

Name // Description 
Public method Load(String) //Gets an HTML document from an Internet resource.  
Public method Load(String, String) //Loads an HTML document from an Internet resource.  
Public method Load(String, String, WebProxy, NetworkCredential) //Loads an HTML document from an Internet resource.  
Public method Load(String, String, Int32, String, String) //Loads an HTML document from an Internet resource. 

您不需要传入WebProxy实例,也可以传入系统默认实例。

或者,您可以连接HtmlWeb.PreRequest并设置请求的凭据。

htmlWeb.PreRequest += (request) => {
    request.Credentials = new NetworkCredential(...);
    return true;
};