选择节点不适用于HtmlAgilityPack [英] selecting Node does not work using HtmlAgilityPack
问题描述
我正在使用VS2010和HTMLAGilityPack1.4.6(来自Net40文件夹).以下是我的HTML
I am using VS2010 and using HTMLAGilityPack1.4.6 (from Net40-folder). Following is my HTML
<html>
<body>
<div id="header">
<h2 id="hd1">
Patient Name
</h2>
</div>
</body>
</html>
我正在C#中使用以下代码访问"hd1".请告诉我正确的方法.
I am using following code in C# to access "hd1". Please tell me correct way to do it.
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
try
{
string filePath = "E:\\file1.htm";
htmlDoc.LoadHtml(filePath);
if (htmlDoc.DocumentNode != null)
{
HtmlNodeCollection _hdPatient = htmlDoc.DocumentNode.SelectNodes("//h2[@id=hd1]");
// htmlDoc.DocumentNode.SelectNodes("//h2[@id='hd1']");
//_hdPatient.InnerHtml = "Patient SurName";
}
}
catch (Exception ex)
{
throw ex;
}
尝试了许多排列和组合...我为空.
Tried many permutations and combinations... I get null.
plz帮助.
推荐答案
您的问题是如何将数据加载到 HtmlDocument 中.为了从文件中加载数据，您应该使用 Load(fileName)方法.但是您正在使用 LoadHtml(htmlString)方法，该方法将"E:\\ file1.htm" 视为文档内容.当HtmlAgilityPack尝试在 E:\\ file1.htm 字符串中找到 h2 标记时，它什么也找不到.这是加载html文件的正确方法:
Your problem is the way how you load data into HtmlDocument. In order to load data from file you should use Load(fileName) method. But you are using LoadHtml(htmlString) method, which treats "E:\\file1.htm" as document content. When HtmlAgilityPack tries to find h2 tags in E:\\file1.htm string, it finds nothing. Here is the correct way to load html file:
string filePath = "E:\\file1.htm";
htmlDoc.Load(filePath); // use instead of LoadHtml
@Simon Mourier也正确指出，如果要获取单个节点，则应使用 SelectSingleNode 方法:
// Single HtmlNode
var patient = doc.DocumentNode.SelectSingleNode("//h2[@id='hd1'");
patient.InnerHtml = "Patient SurName";
或者，如果您正在处理节点集合，则循环处理它们:
Or if you are working with collection of nodes, then process them in a loop:
// Collection of nodes
var patients = doc.DocumentNode.SelectNodes("//div[@class='patient'");
foreach (var patient in patients)
patient.SetAttributeValue("style", "visibility: hidden");
这篇关于选择节点不适用于HtmlAgilityPack的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
