Question

如果给定一个特定的url，我有一个获取id和xpath的方法。如何通过请求传递用户名和密码，以便我可以抓取需要用户名和密码的网址？

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请求获取页面源，然后将该文件传递给上面的方法吗？

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

Answer 1

HtmlWeb.Load有多个重载，这些重载接受NetworkCredential的实例，或者您可以直接传递用户名和密码。

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.

您无需传入WebProxy实例，也无需传入系统默认实例。

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;
};

HtmlAgilityPack和身份验证

1 个答案: