使用XmlNode（c＃）进行相对XPath选择

Question

Say i have the following xml file:

<a>
  <b>
    <c></c>
  </b>
  <b>
    <c></c>
  </b>
</a>

var nodes = doc.SelectNodes("/a/b");

will select the two b nodes.

I then loop these two nodes suchas:

 foreach (XmlNode node in nodes) { }

However, when i call node.SelectNodes("/a/b/c"); It still returns both values and not just the descendants. Is it possible to select nodes only descening from the current node ?

Answer 1

在foreach循环中，您已经知道该node是原始文档中的/a/b - 因此只需使用相对 xpath就可以得到它的 c子node ：

node.SelectNodes("c")

Answer 2

你可以使用node.SelectSingleNode("C");

Answer 3

/a/b[1]/c

For intance gets the nodelist of all the children of the first b that have the tagname c.

To get the first c as a singleton nodelist use /a/b[1]/c[1]. /a/b/c[1] again returns a nodelist of multiple nodes.

SelectSingleNode is probably misleading, as far as I know, XPath always returns a nodelist, which can contain optionally one node (or even be empty).

//c[1] just selects the first c in the document.