c# - HtmlAgilityPack - 从 html 表中获取数据-6ren

c# - HtmlAgilityPack - 从 html 表中获取数据

转载作者：行者123 更新时间：2023-11-28 00:21:29

我的程序使用 HtmlAgilityPack 并抓取一个 HTML 网页，将其存储在一个变量中，我试图从 HTML 中获取特定 Div 类标签 (boardcontainer) 下的两个表。使用我当前的代码，它会在整个网页中搜索每个表格并显示它们，但是当单元格为空时，它会引发异常:

“NullReferenceException 未处理 - 对象引用未设置为对象的实例。”。

HTML 片段(在本例中，我在网站上搜索“Microsoft”:

<div class="boardcontainer">
<table cellpadding="4" cellspacing="1" border="0" width="100%">
<tr><td colspan="6" class="catbg" height="18" >Main Database</td></tr>
<tr>
    <td class="windowbg" width="28%" align="center">Company Name</td>
    <td class="windowbg" width="12%" align="center">0870 / 0871</td>
    <td class="windowbg" width="12%" align="center">0844 / 0845</td>
    <td class="windowbg" width="12%" align="center">01 / 02 / 03</td>
    <td class="windowbg" width="12%" align="center">Freephone</td>
    <td class="windowbg" width="24%" align="center">Other Information</td>
</tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.websitename.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�01954 713950</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC>�<b>Customer Support</b><br><i>Straight to agent (no menu)</i><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.websitename.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0118 909 7800</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC>�<b>Main UK Switchboard</b><br><i>Ask to be put through to required department</i><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>

这是我当前的代码，它只抓取表格并显示行和单元格，然后在 Null 时抛出异常。

        string html = myRequest.GetResponse();
        HtmlDocument htmlDoc = new HtmlDocument();
        htmlDoc.LoadHtml(html);


        foreach (HtmlNode table in htmlDoc.DocumentNode.SelectNodes("//table"))
        {
            Console.WriteLine("Found: " + table.Id);
            foreach (HtmlNode row in table.SelectNodes("tr"))
            {
                Console.WriteLine("row");
                foreach (HtmlNode cell in row.SelectNodes("th|td")) //Exception is thrown here
                {
                    Console.WriteLine("cell: " + cell.InnerText);
                }
            }
        }

我如何更改它以搜索特定的 div 类并从中提取表格？

感谢阅读。

完整的 HTML:

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />

<form method="post" action="sdfsd.php">
<html>
<head><title>SAYNOTO0870.COM - Non-Geographical Alternative Telephone Numbers</title>
<meta name='copyright' content='SAYNOTO0870.COM - 1999-2010'>
<META name="y_key" content="5a00e35b9f1986b0" >
</head>

<body>
<BODY bgColor=#ffffe6>
<table border="0" width="100%" id="headertable1">
    <tr>

        <td width="335" valign="top">
<font face='Tahoma' size='2'>
        <center><b>
        <font size="6">SAY<font color="#FF0000">NO</font>TO<font color="#FF0000">0870</font>.COM</font>
</b></center>
</font>
<font face='Tahoma' size='4'>
<center><b><font size="2">Non-Geographical Alternative Telephone Numbers</font></b><font size="3"></font><font face='Tahoma' size='2'></font><br>

<span style="font-weight: 700"><font size="1">Awarded Website Of The Day by 
BBC Radio 2, and  featured<br>
on the BBC Radio 2's 
Jeremy Vine show and The Guardian.</font></span></center>
        </td>
        <td width="403" rowspan="2" align="center">

<a href="http://energy.saynoto0870.com" target="_blank"><img src="/banners/energyheader.gif" alt="Save Money on your Gas and Electricity" width="420" height="60" border="0" align="middle"></a>        
        </td>  </tr></table>
<table width="92%" cellspacing="1" cellpadding="0" border="0" align="CENTER">
  <tr> 
    <td align="center"> 
      <table bgcolor="#AFC6DB" width="100%" cellspacing="0" cellpadding="0" align="center">

        <tr> 
          <td width="100%" align="center"> 
            <table border="0" width="100%" cellpadding="3" cellspacing="0" bgcolor="#AFC6DB" align="center">
              <tr> 
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="180">
<font face='Tahoma' size='2'>
                <b>
<a href="/">
                <img src="/images/home.gif" alt="Home" border="0">Home</a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="143">
                <b>

<font face='Tahoma' size='2'>

                <a href="/cgi-bin/forum/YaBB.cgi">
                <img src="/images/forum.gif" alt="Discussion Forum" border="0">Discussion Forum</a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="134">
                <font face="Tahoma" size="2">
                <b>
                <a href="/links.php">
                <img src="/images/links.gif" alt="Links" border="0">Links</a></td>

                <td valign="middle" bgcolor="#CCFFCC" align="center" width="103">
                <font face="Tahoma" size="2">
                <b>
                <a href="/help.php">
                <img src="/images/help.gif" alt="Help" border="0">Help</a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="114">
                <font face="Tahoma" size="2">
                <b>

                <a href="/contact">
                <img src="/images/contact.gif" alt="Contact Us" border="0">Contact Us</a>
                </td>
              </tr>
              <tr> 
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="321" colspan="2">
<font face='Tahoma' size='2'>
                <a href="/search.php">
                <font face="Tahoma">

                <b>
                <font size="2">
                <img src="/images/search.gif" alt="Search" border="0"></font></b></font><font size="2"><b>Search 
                to find an alternative number</b></font></a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="365" colspan="3">
<font face='Tahoma' size='2'>
                <a href="/add.php">
                <font face="Tahoma">
                <b>
                <font size="2">

                <img src="/images/addno.gif" alt="Add A New Number" border="0"></font></b></font><font size="2"><b>Click 
                here to add a new alternative number</b></font></a></td>
              </tr>
            </table>
          </td>
        </tr>
      </table>
    </td>
  </tr>

</table>

<br>
<center>
<script type="text/javascript"><!--
google_ad_client = "pub-9959843696187618";
google_ad_width = 468;
google_ad_height = 60;
google_ad_format = "468x60_as";
google_ad_type = "text_image";
//2007-06-07: SAYNOTO0870-Header
google_ad_channel = "6422558175";
google_color_border = "ffffe6";
google_color_bg = "ffffe6";
google_color_link = "32527A";
google_color_text = "000000";
google_color_url = "2D8930";
//-->
</script>
<script type="text/javascript"
  src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</center>
<BR><input type=hidden name="search_name" value="Microsoft">
</form>
<link rel="stylesheet" href="search.css" type="text/css" />

  <table width="100%" align="center" border="0">
  <tr>

    <td><font size="2">

<div class="seperator"></div>

<div class="boardcontainer">
<table cellpadding="4" cellspacing="1" border="0" width="100%">
<tr><td colspan="6" class="catbg" height="18" >Main Database</td></tr>

<tr>
    <td class="windowbg" width="28%" align="center">Company Name</td>
    <td class="windowbg" width="12%" align="center">0870 / 0871</td>

    <td class="windowbg" width="12%" align="center">0844 / 0845</td>
    <td class="windowbg" width="12%" align="center">01 / 02 / 03</td>
    <td class="windowbg" width="12%" align="center">Freephone</td>
    <td class="windowbg" width="24%" align="center">Other Information</td>
</tr>


    <tr>

<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 01954 713950</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Customer Support</b><br><i>Straight to agent (no menu)</i><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0118 909 7800</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Main UK Switchboard</b><br><i>Ask to be put through to required department</i><br><font size=1>Also for 0870 6010200</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35314502113</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Customer Support</b><br><i>Answers as Microsoft Ireland with same options as UK 08 numbers</i><br>Reduce cost using 1899 (or similar)<br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 241 1963</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 020 3147 4930</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 0188354</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Product Activation</b><br><i>Home & Business (Volume Licensing)</i><br><font size=1>Also: 0800 018 8364 & +800 2284 8283<br>Also for 0870 6010100 & 0870 6010200</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 241 1963</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 9179016</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Volume Licensing</b></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 020 3027 6039</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 7318457</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Online Services Support</b><br><i>MSN, Hotmail, Live, Messenger etc</i><br><font size=1>Also: 0800 587 2920</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 607 0700</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 6006</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35317065353</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Ask Partner Hotline</b><br><i>Answers with same options</i><br>Reduce cost using 1899 (or similar)</td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 607 0700</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 6006</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 9173128</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Partner Network Regional Service Centre</b><br><i>Help with membership questions and tools, benefits and resource queries</i></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 0324479</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Direct Services</b><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk/msdn target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35318831002</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 0517215</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>MSDN (Microsoft Developers Network)</b><br>When calling +353 reduce cost using 1899 (or similar)<br><font size=1>Also for 0870 6010200</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk/technet target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35318831002</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 281221</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Microsoft Technet</b><br>When calling +353 reduce cost using 1899 (or similar)<br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.xbox.co.uk target="_blank">Microsoft XBOX</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 020 7365 9792</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 5871102</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Customer Support</b></td></tr>

    <tr>

</tr>
</table>
</div><br />    

<table width="100%" align="center" border="0">
  <tr><td><font size="2">
<div class="seperator"></div>

<div class="boardcontainer">
<table cellpadding="4" cellspacing="1" border="0" width="100%">

<tr><td colspan="6" class="catbg" height="18" >Unverified Numbers Database</td></tr>

<tr>
    <td class="windowbg" width="28%" align="center">Company Name</td>
    <td class="windowbg" width="12%" align="center">0870 / 0871</td>
    <td class="windowbg" width="12%" align="center">0844 / 0845</td>
    <td class="windowbg" width="12%" align="center">01 / 02 / 03</td>
    <td class="windowbg" width="12%" align="center">Freephone</td>
    <td class="windowbg" width="24%" align="center">Other Information</td>

</tr>

<td class=windowuv width=28% align=center BGCOLOR=#CCFFFF> Microsoft</td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0870 501 0800</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0844 800 8338</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0118 909 7994</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=24% align=center BGCOLOR=#CCFFFF> <b>Premier Support</b></td></tr>
    <tr>
<td class=windowuv width=28% align=center BGCOLOR=#CCFFFF>Microsoft AskPartner (Licensing)</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0870 607 0700</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 020 8784 1000</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=24% align=center BGCOLOR=#CCFFFF> Switchboard of Sitel UK in Kingston where the AskPartner team is based. Ask for Microsoft Team. 0800 - 1800.</td></tr>

    <tr>
<td class=windowuv width=28% align=center BGCOLOR=#CCFFFF> Microsoft Office Live Meeting</td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 020 3024 9260</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0800 0854811</a></td><td class=windowuv width=24% align=center BGCOLOR=#CCFFFF> EMC Conferencing on Meeting Place</td></tr>

</tr>
</table>
</div><br />

<center>
<a href="http://homephone.consumerchoices.co.uk/?partner=saynoto0870" target="_blank">

<img src="/banners/consumerchoices.png" border="0" alt="ConsumerChoices" align="middle"></img></a>
<BR><BR>
</center>

<div class="seperator">
<table cellpadding="4" cellspacing="1" border="0" width="100%">
<tr>
    <td class="titlebg" align="center" colspan="2">
        Info Centre
    </td>
</tr>

    <td class="windowbg2">
        <div style="float: left; width: 59%; text-align: left;">

        <span class="small">Please use the Contact Us option, to report any incorrect numbers that you notice on the site.  Thanks for your support.</span><br />
        </div>
        <div style="float: left; width: 40%; text-align: left;">
        <div class="small" style="float: left; width: 49%;"><span style="color: red;"><b>lllll</b></span> Main Database - A number that has been checked and at the time it was checked worked correctly.  Please let us know of any numbers that no longer work as expected.</div><div class="small" style="float: left; width: 49%;"><span style="color: #CCFFFF;"><b>lllll</b></span> Unverified Number - A number that has been added by a visitor to the website, and hasn't yet been verified as correct.  Please use the Contact Us link at the top of the page to let us know if these work (or don't work) for you.</div>
        </div>

    </td>
</tr>
</table>

</div>
    </font></td>
  </tr>
</table>


<br>

<head>
<style>
<!--.smallfont{ font: 11px verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;}-->

</style>
</head>
<b>
<center>
<font color='red'>
</center>
</b>
</font>
<BR>
<center>

<script type="text/javascript"><!--
google_ad_client = "pub-9959843696187618";
google_ad_width = 728;
google_ad_height = 90;
google_ad_format = "728x90_as";
google_ad_type = "text_image";
//2007-06-07: SAYNOTO0870-Footer
google_ad_channel = "7459969292";
google_color_border = "FFFFE6";
google_color_bg = "FFFFE6";
google_color_link = "32527A";
google_color_text = "000000";
google_color_url = "2D8930";
//-->
</script>
<script type="text/javascript"  src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>
<BR></center>
<BR><center><B>

<font face="Tahoma" size="2">
Website and Content © 1999-2011 SAYNOTO0870.COM.&nbsp; All Rights Reserved</b>.
<br><b>Written permission is required to duplicate any of the content within this site. </b></center></font>
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script>
<script type="text/javascript">_uacct = "UA-194609-1";urchinTracker();</script>
</body></html>

最佳答案

以下 XPATH 允许您在 HTML 文档中搜索特定的 DIV(类为“boardcontainer”):

//div[@class='boardcontainer']/table

要处理空行，只需检查返回的 HtmlNodeCollection 是否为 null。

这是一个完整的例子:

HtmlDocument htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(html);

foreach (HtmlNode table in htmlDoc.DocumentNode.SelectNodes("//div[@class='boardcontainer']/table"))
{
  Console.WriteLine("Found: " + table.Id);

  foreach (HtmlNode row in table.SelectNodes("tr"))
  {
    Console.WriteLine("row");

    HtmlNodeCollection cells = row.SelectNodes("th|td");

    if (cells == null)
    {
      continue;
    }

    foreach (HtmlNode cell in cells)
    {                        
      Console.WriteLine("cell: " + cell.InnerText);
    }
  }
}

您还应该检查是否找到了一个表，以及找到的表是否包含行。

关于c# - HtmlAgilityPack - 从 html 表中获取数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8580762/

文章推荐： javascript - 计算嵌套 json 中选择的元素数量

文章推荐： C++:将 int 转换为 unsigned char

文章推荐： c++ - Windows 上的 Boost asio 套接字无法异步连接

mysql - 同步/流式传输 MySQL 表/表(连接表)与 PostgreSQL 表/表
我有一台 MySQL 服务器和一台 PostgreSQL 服务器。需要从多个表中复制或重新插入一组数据 MySQL 流式传输/同步到 PostgreSQL 表。这种复制可以基于时间(Sync)或事
php - 从用户(表)获取数据其中用户(表)的id等于 friend (表)的id
如果两个表的 id 彼此相等，我尝试从一个表中获取数据。这是我使用的代码: SELECT id_to , email_to , name_to , status_to
sql - Excel 表 SQL 表
我有一个 Excel 工作表。顶行对应于列名称，而连续的行每行代表一个条目。如何将此 Excel 工作表转换为 SQL 表？我使用的是 SQL Server 2005。最佳答案这取决于您使用哪
mysql - 如何将两个django模型(表)合并为一个模型(表)
我想合并两个 Django 模型并创建一个模型。让我们假设我有第一个表表 A，其中包含一些列和数据。 Table A -------------- col1 col2 col3 col
mysql - 表 1、表 2 的多列左连接
我有两个表:table1，table2，如下所示 table1: id name 1 tamil 2 english 3 maths 4 science table2: p
sql - 大传感器数据最佳选择。表 SQL 与 Azure 表
关闭。此题需要details or clarity 。目前不接受答案。想要改进这个问题吗？通过 editing this post 添加详细信息并澄清问题. 已关闭 1 年前。 Improve th
dynamics-ax-2009 - 表=表与表.数据(表)
下面两个语句有什么区别？ newTable = orginalTable 或 newTable.data(originalTable) 我怀疑 .data() 方法具有性能优势，因为它在标准 AX 中
SQL Server 表 -(或可能是任何 SQL 表)没有主键会影响性能吗？
我有一个表，我没有在其中显式定义主键，它并不是真正需要的功能......但是一位同事建议我添加一个列作为唯一主键以随着数据库的增长提高性能...... 谁能解释一下这是如何提高性能的？没有使用索引(
php - 将产品详细信息插入 'product' 表，并将产品图像插入 'image' 表
如何将表“产品”中的产品记录与其不同表“图像”中的图像相关联？我正在对产品 ID 使用自动增量。我觉得不可能进行关联，因为产品 ID 是自动递增的，因此在插入期间不可用! 如何插入新产品，获取产品
python - 创建一个新的 sql 表，其中的列源自另一个 sql 表
我有一个 sql 表，其中包含关键字和出现次数，如下所示(尽管出现次数并不重要): ____________ dog | 3 | ____________ rat | 7 | ____
MySQL LAST_INSERT_ID() 与 INSERT INTO 表 SELECT FROM 表
是否可以使用目标表中的LAST_INSERT_ID更新源表？ INSERT INTO `target` SELECT `a`, `b` FROM `source` 目标表有一个自动增量键id，我想将其
mysql - 查询 - 在简单的 mysql 内连接中定义(表，表)
我正在重建一个搜索查询，因为它在“我看到的”中变得多余，我想知道什么 (albums_artists, artists) ( ) does in join? is it for boosting pe
innodb - mysqldump 备份缺少所有 innodb 表，但没有 MyISAM 表
以下是我使用 mysqldump 备份数据库的开关: /usr/bin/mysqldump -u **** --password=**** --single-transaction --databas
html - 为什么 MySQL 表中的所有行都是相同的？ (MySQL 表 > HTML 表)
我试图获取 MySQL 表中的所有行并将它们放入 HTML 表中: Exam ID Status Assigned Examiner
mysql - 查询 'photos' 表，同时查询 'bookmarks' 表，以便知道添加书签的照片
如何查询名为 photos 的表中的所有记录，并知道当前用户使用单个查询将哪些结果照片添加为书签？这是我的表格: -- -- Table structure for table `photos` -
Mysql MEMORY 表 vs InnoDB 表(很多插入，很少读取)
我的网站都在 InnoDB 表上运行，目前为止运行良好。现在我想知道在我的网站上实时发生了什么，所以我将每个页面浏览量(页面、引荐来源网址、IP、主机名等)存储在 InnoDB 表中。每秒大约有 10
mysql - 如何在 mysql 中存储客户数据(2 表 vs 1 表)
我在想我会为 mysql 准备两个表。一个用于存储登录信息，另一个用于存储送货地址。这是传统方式还是所有内容都存储在一张表中？对于两个表...有没有办法自动将表 A 的列复制到表 B，以便我可以引用
mysql - 表 1 包含名字和姓氏，表 2 包含两列引用表 1 上的名称
我不是程序员，我从这个表格中阅读了很多关于如何解决我的问题的内容，但我的搜索效果不好我有两张 table 表 1:成员 id*| name | surname -------------------
c# - 如何在 ASP.NET 中显示 "View"表(SQL 表)？
我知道如何在 ASP.NET 中显示真实表，例如 public ActionResult Index() { var s = db.StaffInfoDBSet.ToList(); r
php - INSERT INTO 表 VALUES.. 与 INSERT INTO 表 SET 错误
我正在尝试运行以下查询: "insert into visits set source = 'http://google.com' and country = 'en' and ref = '1234

行者123

个人简介

我是一名优秀的程序员,十分优秀！

作者热门文章

滴滴打车优惠券免费领取

全站热门文章

首页

博学

6Ren·AI

商城

c# - HtmlAgilityPack - 从 html 表中获取数据