C#HTML Agility Pack(SelectSingleNode) [英] C# Html Agility Pack ( SelectSingleNode )

问题描述

我正在尝试解析此字段，但无法使其正常工作.当前尝试:

I'm trying to parse this field, but can't get it to work. Current attempt:

var name = doc.DocumentNode.SelectSingleNode("//*[@id='my_name']").InnerHtml;


<h1 class="bla" id="my_name">namehere</h1>

错误:对象引用未设置为对象的实例.

Error: Object reference not set to an instance of an object.

感谢任何帮助.

@John-我可以确保HTML正确加载.我正在尝试读取我的Facebook名称以供学习.这是Firebug插件的屏幕截图.我使用的版本是1.4.0.

@John - I can assure that the HTML is correctly loaded. I am trying to read my facebook name for learning purposes. Here is a screenshot from the Firebug plugin. The version i am using is 1.4.0.

http://i54.tinypic.com/kn3wo.jpg

我想问题是profile_name是一个子节点或其他东西，这就是为什么我无法读取它的原因?

I guess the problem is that profile_name is a child node or something, that's why I'm not able to read it?

推荐答案

代码不起作用的原因是因为页面上有JavaScript实际上正在写出<h1 id='profile_name'>标记，因此如果您请求没有执行JavaScript的用户代理(或通过AJAX)显示的页面，则找不到该元素.

The reason your code doesn't work is because there is JavaScript on the page that is actually writing out the <h1 id='profile_name'> tag, so if you're requesting the page from a User Agent (or via AJAX) that doesn't execute JavaScript then you won't find the element.

我可以使用以下选择器获得自己的名字:

I was able to get my own name using the following selector:

string name = 
    doc.DocumentNode.SelectSingleNode("//a[@id='navAccountName']").InnerText;

这篇关于C#HTML Agility Pack(SelectSingleNode)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！