C# 使用 HtmlAgilityPack 解析 HTML 页面
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Parsing HTML page with HtmlAgilityPack
提问by Hassen
Using C# I would like to know how to get the Textbox value (i.e: john) from this sample html script :
使用 C# 我想知道如何从这个示例 html 脚本中获取文本框值（即：john）：
<TD class=texte width="50%">
<DIV align=right>Name :<B> </B></DIV></TD>
<TD width="50%"><INPUT class=box value=John maxLength=16 size=16 name=user_name> </TD>
<TR vAlign=center>
采纳答案by gpmcadam
There are a number of ways to select elements using the agility pack.
有多种使用敏捷包选择元素的方法。
Let's assume we have defined our HtmlDocumentas follows:
假设我们已经定义HtmlDocument如下：
string html = @"<TD class=texte width=""50%"">
<DIV align=right>Name :<B> </B></DIV></TD>
<TD width=""50%"">
<INPUT class=box value=John maxLength=16 size=16 name=user_name>
</TD>
<TR vAlign=center>";
HtmlDocument htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(html);
1. Simple LINQ
We could use the Descendants()method, passing the name of an element we are in search of:
1. 简单的 LINQ
我们可以使用该Descendants()方法，传递我们要搜索的元素的名称：
var inputs = htmlDoc.DocumentNode.Descendants("input");
foreach (var input in inputs)
{
Console.WriteLine(input.Attributes["value"].Value);
// John
}
2. More advanced LINQ
We could narrow that down by using fancier LINQ:
2. 更高级的 LINQ
我们可以通过使用更高级的 LINQ来缩小范围：
var inputs = from input in htmlDoc.DocumentNode.Descendants("input")
where input.Attributes["class"].Value == "box"
select input;
foreach (var input in inputs)
{
Console.WriteLine(input.Attributes["value"].Value);
// John
}
3. XPath
Or we could use XPath.
3. XPath
或者我们可以使用XPath。
string name = htmlDoc.DocumentNode
.SelectSingleNode("//td/input")
.Attributes["value"].Value;
Console.WriteLine(name);
//John
回答by TrueWill
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);
XPathNavigator docNav = doc.CreateNavigator();
XPathNavigator node = docNav.SelectSingleNode("//td/input/@value");
if (node != null)
{
Console.WriteLine("result: " + node.Value);
}
I wrote this pretty quickly, so you'll want to do some testing with more data.
我写得很快，所以你需要用更多的数据做一些测试。
NOTE: The XPath strings apparently have to be in lower-case.
注意：XPath 字符串显然必须是小写的。
EDIT: Apparently the beta now supports Linq to Objects directly, so there's probably no need for the converter.
编辑：显然测试版现在直接支持 Linq to Objects，因此可能不需要转换器。
