在 htmlAgilityPack VB.NET 中获取 <ul> <li> 和 <b> 标记

Question

老实说，我不知道该怎么做，而且我很困惑。我的代码可能不值得分享，但我会尽力提出问题。

<div class="pricing-table">
    <div class="span4">
        <div class="plan">
            <h3>PPTP <span>$0</span></h3>
            <ul>
                <li><b>IP:</b> " (hidden)"</li>
                <li><b>Username:</b> " Guest"</li>
                <li><b>Password:</b> " (hidden)"</li>
                <li><b>Unlimited</b> " Bandwidth"</li>
                <li><b>Torrents</b> " Allowed"</li>
                <li><b>No</b> " Logging"</li>
            </ul>
        </div>
    </div>
</div>

（这是第二个）

<div class="span4">
    <div class="plan most-popular">
        <h3>Open<span>$0</span></h3>
        <div class="plan-ribbon-wrapper">
            <div class="plan-ribbon">
                Popular
            </div>
        </div>
        <ul>
            <li><b>Username:</b> user</li>
            <li><b>Password:</b> (hidden)</li>
            <li><b>TCP</b> 80, 443</li>
            <li><b>UDP</b> 53, 40000</li>
            <li><b>Unlimited</b> Bandwidth</li>
            <li><b>Torrents</b> Allowed</li>
            <li><b>No</b> Logging</li>
        </ul><a class="btn btn-large btn-primary" href=
        "%20(hidden)">Download</a>
    </div>
</div>
<ul>
    <li><b>Username:</b> user</li>
    <li><b>Password:</b> (hidden)</li>
    <li><b>TCP</b> 80, 443</li>
    <li><b>UDP</b> 53, 40000</li>
    <li><b>Unlimited</b> Bandwidth</li>
    <li><b>Torrents</b> Allowed</li>
    <li><b>No</b> Logging</li>
</ul>

使用此 HTML 代码，我想复制用户名和密码并将其放入表单的标签中。

这是我的代码

Imports HtmlAgilityPack
Public Class Form1
Dim Prev_Pass, Prev_User, Currt_Pass, Currt_User, Info
Dim counter As Integer
Dim web As New HtmlWeb()
Dim htmldoc As HtmlAgilityPack.HtmlDocument = New HtmlAgilityPack.HtmlDocument
Dim htmlnodes As HtmlAgilityPack.HtmlNodeCollection = Nothing
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    htmldoc = web.Load("website")
    htmlnodes = htmldoc.DocumentNode.SelectNodes("//div[@class=""pricing-table""]")
    For Each node As HtmlAgilityPack.HtmlNode In htmlnodes
        Dim releaseNode = node.SelectSingleNode("//div[@class=""plan most-popular""]")
            Info = releaseNode.SelectSingleNode("//ul/li/b[contains(text(), 'Username: ')]").InnerText
    Next
    Label3.Text = Info
End Sub
End Class

Answer 1

考虑以下注释：

<li>
    <b>Username:</b> <!-- Use XPath to obtain this element. -->
    " user" <!-- This is the next sibling. -->
</li>

记住这些注释：

您可以像之前那样使用 XPath 获取 <b> 元素，然后通过 NextSibling 属性访问用户名或密码文本，如下所示：

Dim username = 
    htmldoc.DocumentNode.SelectSingleNode(
        "//ul/li/b[text()='Username:']").NextSibling.InnerHtml

Dim password =
    htmldoc.DocumentNode.SelectSingleNode(
        "//ul/li/b[text()='Password:']").NextSibling.InnerHtml

如果您想访问元素的第二次出现而不是第一次出现，那么您应该使用更具体的 XPath 或使用 SelectNodes 并通过 获取位于第二个索引处的元素像这样的索引器：

Dim username =
    htmldoc.DocumentNode.SelectNodes(
        "//ul/li/b[text()='Username:']")(1).NextSibling.InnerHtml