如何使用NameSpace Manager或XsltContent解析aspx页面?
我正在使用HtmlAgilityPack。
我正在尝试解析aspx页面以获取Button和Label控件ID。当我尝试使用asp:Button元素选择节点时出现以下错误。
这是错误消息:
需要名称空间管理器或XsltContext。该查询具有前缀,变量或用户定义的函数。
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
string filePath = @"C:\webform4.aspx";
htmlDoc.Load(filePath);
foreach (HtmlNode div in htmlDoc.DocumentNode.SelectNodes("//div"))
{
Response.Write(div.Id);
foreach (HtmlNode asp in div.SelectNodes("asp:Button"))
{
Response.Write(asp.Id);
}
}
我的aspx页面如下所示:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm4.aspx.cs" Inherits="WebApplication1.WebForm4" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div id="mydiv">
<asp:Button ID="Button1" runat="server" Text="Button on page4" />
<br />
<br />
<asp:Label ID="Label1" runat="server" Text="Label on page 4"></asp:Label>
<br />
<br />
<asp:Button ID="Button2" runat="server" Text="second button page 4" />
<br />
<asp:Button ID="Button3" runat="server" Text="second button page 4" />
</div>
</form>
</body>
</html>
最佳答案
我将Linq与Agility Pack一起使用,而不是XPath,这又如何呢?
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
string filePath = @"C:\webform4.aspx";
htmlDoc.Load( filePath );
var aspNodes = htmlDoc.DocumentNode.Descendants().Where( n => n.Name.StartsWith( "asp:" ) );
foreach ( var aspNode in aspNodes ) {
Console.WriteLine( "Element: {0} Id: {1}", aspNode.Name, aspNode.Attributes["Id"].Value );
}