XPath表达式以选择所有节点

Question

I would like to find all <Field /> nodes (that may be arbitrarily nested) inside a given XmlNode.

If do something like this:

foreach(XmlNode n in node.SelectNodes('//Field'))...

This returns all nodes in the entire document, not all nodes under node .

Is this how XPath is supposed to work? I looked at some documents and it seems like the //Node query should be scoped to whatever node it's invoked at.

Is there any other technique to select all nodes with a given name that are under a specific node?

Answer 1

If you use '//Field' it's absolut from the root of the document. To search relative to the current node, just use './/Field' .

Answer 2

尝试使用SelecteSingleNode()

Answer 3

Use ./Field .

• .// Means descendants, which includes children of children (and so forth).
• ./ Means direct children.

If a XPath starts with a / it becomes relative to the root of the document; to make it relative to your own node start it with ./ .

Answer 4

You can use simple linq query like this:

var techLeads = (from value in element.Descendants ("Manager")
where value.Attribute ("Name").Value == "Mgr1"
select value).Descendants("TechLead");

Sample Xml:

 <Employees> <Manager Name="Mgr1"> <TechLead Name="TL1" /> <TechLead Name="TL2" /> </Manager> </Employees> 

Answer 5

删除//因为否则它将在所有文档中搜索到根节点。

node.SelectNodes("Field")