C# 用于选择下一个兄弟的 Xpath
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Xpath for choosing next sibling
提问by Ula Krukar
I have piece of HTML like this:
我有一段这样的 HTML：
<dt>name</dt> <dd>value</dd> <dt>name2</dt> <dd>value2</dd>
I want to find all places where the structure is incorrect, meaning there is no ddtag after dttag.
我想找到结构不正确的所有地方，这意味着dd标签后没有dt标签。
I tried this:
我试过这个：
//dt/following-sibling::dt
but this doesn't work. Any suggestions?
但这不起作用。有什么建议？
采纳答案by AakashM
EDITas noted by @Gaim, my original version failed to capture a terminal dt
编辑@Gaim 指出，我的原始版本未能捕获终端dt
string xml = @"
<root>
<dt>name</dt>
<dd>value</dd>
<dt>name2</dt>
<dt>name3</dt>
<dd>value3</dd>
<dt>name4</dt>
<dt>name5</dt>
<dd>value5</dd>
<dt>name6</dt>
</root>
";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
XmlNodeList nodes =
doc.SelectNodes("//dt[not(following-sibling::*[1][self::dd])]");
foreach (XmlNode node in nodes)
{
Console.WriteLine(node.OuterXml);
}
Console.ReadLine();
Output is those dtnodes that do not have a ddimmediately following them:
输出是那些dt没有dd紧跟其后的节点：
<dt>name2</dt>
<dt>name4</dt>
<dt>name6</dt>
What we are doing here is saying:
我们在这里所做的是说：
//dt
All dtnodes, anywhere....
所有dt节点，任何地方......
[not(following-sibling::*[1]
....such that it's notthe case that their first following sibling (whatever it is called)....
....这样他们的第一个跟随兄弟姐妹（不管它叫什么）不是这样的。
[self::dd]]
...is called dd.
...被称为dd。
回答by Gaim
I am not sure that I understand you but there is my solution. This XPath matches ALL <dt>which are not followed by <dd>directly. So There is test structure
我不确定我是否理解你，但有我的解决方案。这个 XPath 匹配 ALL<dt>后面没有<dd>直接跟的。所以有测试结构
<xml>
<dt>name</dt> <!-- match -->
<dt>name2</dt>
<dd>value2</dd>
<dt>name</dt>
<dd>value</dd>
<dt>name2</dt> <!-- match -->
</xml>
There is the XPath
有 XPath
//dt[ name( following-sibling::*[1] ) != 'dd' ]
or
或者
//dt[ not( following-sibling::*[1]/self::dd ) ]
they do same thing
他们做同样的事情
