Warning: file_get_contents(/data/phpspider/zhask/data//catemap/2/csharp/338.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181

Warning: file_get_contents(/data/phpspider/zhask/data//catemap/3/xpath/2.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181

Warning: file_get_contents(/data/phpspider/zhask/data//catemap/9/solr/3.json): failed to open stream: No such file or directory in /data/phpspider/zhask/libs/function.php on line 167

Warning: Invalid argument supplied for foreach() in /data/phpspider/zhask/libs/tag.function.php on line 1116

Notice: Undefined index: in /data/phpspider/zhask/libs/function.php on line 180

Warning: array_chunk() expects parameter 1 to be array, null given in /data/phpspider/zhask/libs/function.php on line 181
C# HtmlAgilityPack id选择_C#_Xpath_Html Agility Pack - Fatal编程技术网

C# HtmlAgilityPack id选择

C# HtmlAgilityPack id选择,c#,xpath,html-agility-pack,C#,Xpath,Html Agility Pack,我正在建立一个C程序,它在一个网站上运行,需要一个span#id 这是我的密码: var web = new HtmlWeb(); var doc = web.Load(url); System.Threading.Thread.Sleep(21000); string adress = doc.DocumentNode .SelectSingleNode("//td/span#myId")

我正在建立一个C程序,它在一个网站上运行,需要一个span#id

这是我的密码:

        var web = new HtmlWeb();
        var doc = web.Load(url);
        System.Threading.Thread.Sleep(21000);
        string adress = doc.DocumentNode
              .SelectSingleNode("//td/span#myId")
              .Attributes["value"].Value;
我总是遇到这样的错误“system.Xml.XPath.XpathException”:


谢谢

假设您的HTML看起来像这样:

<body>
  <table>
    <tr>
      <td><span id="testedAddress">Some text here</span></td>
    </tr>
  </table>
</body>

这里有一些文字

那么您需要的XPath是
//td/span[@id='testedAddress']

您的代码不足以理解错误,而且错误信息不是英文的。翻译整个错误。