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POCode sample using HTMLAgilitypack to select ASPX nodes by xpath
 

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    <p>I would like to find out why my code doesn't work (or, get a piece of <strong>working</strong> sample code) </p> <p>What I'm trying to do is to query an ASPX file using the HTMLAgilityPack, by an XPATH expression</p> <p>This is the code, if you input <strong>//asp:content</strong> , you got 0 nodes (Form1.designer.cs omitted for clarity):</p> <pre><code>using hap = HtmlAgilityPack; using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Xml.Linq; using System.Text; using System.Windows.Forms; namespace hap_shell { public partial class Form1 : Form { public Form1() { InitializeComponent(); lbl_ErrMsg.Text = ""; } private void button1_Click(object sender, EventArgs e) { try { lbl_ErrMsg.Text = ""; hap.HtmlDocument doc = new hap.HtmlDocument(); hap.HtmlWeb hw = new hap.HtmlWeb(); doc.Load(txt_FilePath.Text); var q = doc.DocumentNode.Descendants("asp:Content"); var cnt = q.Count(); var nodes = q.ToList(); var nav = doc.CreateNavigator(); System.Xml.XmlNamespaceManager mgr = new System.Xml.XmlNamespaceManager(nav.NameTable); mgr.AddNamespace("asp", "http://www.w3.org/1999/xhtml/"); // "http://tempuri.org/foo"); var selNodes =nav.Select(txt_xpath.Text, mgr); //var selNodes = doc.DocumentNode.SelectNodes(txt_xpath.Text); if (selNodes == null) { lbl_ErrMsg.Text = "No nodes match your query."; } lbl_ErrMsg.Text = selNodes.Count.ToString() + " nodes selected"; } catch (Exception ex) { lbl_ErrMsg.Text = (ex.Message); } } } } </code></pre> <p>this is the testing aspx, please save to a file, and input its full path to txt_FilePath:</p> <pre><code>&lt;%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="back_cal.aspx.cs" Inherits="EDP_SYS.back_cal" %&gt; &lt;asp:content id="Content1" contentplaceholderid="HeadContent" runat="server" &gt; &lt;/asp:content&gt; &lt;asp:content id="Content2" contentplaceholderid="MainContent" runat="server"&gt; &lt;table&gt; &lt;tr&gt;&lt;td&gt; &lt;asp:button id="Button1" runat="server" text="Search"&gt;&lt;/asp:button&gt;&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt; &lt;/asp:content&gt; </code></pre> <h2>Note:</h2> <ol> <li>I know that adding the namespace <a href="http://www.w3.org/1999/xhtml/" rel="nofollow">http://www.w3.org/1999/xhtml/</a> doesn't make sense, please advise the correct way of adding the namespace</li> <li>It works when input is //tr, //td etc</li> <li>doc.DocumentNode.Descendants("asp:Content") works, but I need to accept a user-input <strong>XPath</strong>, so it won't be considered (same for LiNQ for XML)</li> </ol>
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    1. COPlease see the updated question, thanks for your help!
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