Xpath 获取html文档的标签

1.html page content:

<div class="mnr-c _yE">
    <div class="_kk _wI">In the news</div>
    <li class="card-section _df g _mZd">
        <div class="_K2 _SYd">
            <div style="overflow:hidden;width:134px;height:100px" class="thumb">
            <a href="http://www.bbc.co.uk/news/uk-30172110" onmousedown="return rwt(this,'','','','2','AFQjCNG3I0r8D75WjgjZODuobF8ne7wCNw','','0CCwQpwIwAQ','','',event)">
                <img height="100" id="uid_0" src="data:image/gif;base64,R0lGODlhAQABAIAAAP///////yH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" width="134" border="0">
            </a>
            </div>
        </div>
        <div class="_I2">
            <a class="_Dk" href="http://www.bbc.co.uk/news/uk-30172110" onmousedown="return rwt(this,'','','','2','AFQjCNG3I0r8D75WjgjZODuobF8ne7wCNw','','0CC0QqQIwAQ','','',event)">
            Google case over online abuse settled</a>
            <div class="_Ck kv">
                <cite>BBC News</cite>‎
                <span class="f"> - </span>
                <span class="f" style="white-space:nowrap">21 hours ago
                </span>
            </div>
        </div>
        <span class="_dwd st s std" style="margin-left:144px">
        A UK businessman who took <em>Google</em> to court over malicious web postings about him&nbsp;...</span>
    </li>
    <div>
        <li class="g _Nn _wbb card-section">
            <a class="_Dk" href="http://www.pcworld.com/article/2851812/google-to-apps-users-take-more-responsibility-for-protecting-your-accounts.html" onmousedown="return rwt(this,'','','','3','AFQjCNH0fmBCNMjPanXErfX6GQmDNsZK7Q','','0CC8QqQIwAg','','',event)">
            New Google Apps dashboard helps users protect accounts</a>
            <div class="_Ck kv">
                <cite>PCWorld</cite>‎<span class="f"> - </span>
                <span class="f" style="white-space:nowrap">5 hours ago</span>
            </div>
        </li>
        <li class="g _Nn _Abb card-section">
            <a class="_Dk" href="http://www.forbes.com/sites/georgeanders/2014/11/24/google-and-facebook-rewire-the-internet-as-fcc-dithers/" onmousedown="return rwt(this,'','','','4','AFQjCNGcPEbPFsUfSxeCneg_aFYBX65fNQ','','0CDEQqQIwAw','','',event)">
            Google And Facebook Rewire The Internet As FCC Dithers</a>
            <div class="_Ck kv">
                <cite>Forbes</cite>‎<span class="f"> - </span>
                <span class="f" style="white-space:nowrap">8 hours ago</span>
            </div>
        </li>
    </div>

2.获取标签：

//获取文档中所有的class="g"或者包含"g"的<li>标签

var allLiNodes = htmlDoc.DocumentNode.SelectNodes(@"//li[@class='g' or contains(@class,'g')]");

//获取当前节点及其所有子节点中的具有先辈的<img>的单个<a>标签

var imageNode = aImageTagNode.SelectSingleNode(@".//img[./ancestor::a/@href]");

3.w3cshcool 实例：

http://www.w3school.com.cn/xpath/xpath_axes.asp

第一次接触，主要是对爬虫的结果进行解析，然后存储测试与发布，准确率还挺高的。

另：若是浏览器，直接获取xpath的方法：

F12  开发真工具，找到对应的元素，在标签上右键，就可以看到一个copy xpath 直接复制即可。