问题
HI,
I am using VB.NET to read an XHTML file. I need my program to find every element within the XML structure which has the "class" attribute set to a specific value.
IE: I need an array (or similar list) of all elements from the document which contain class="mytag".
There is a list of several values I need to detect, all of which start with the same word 'mytag' followed by another word - so using a "contains" function seems sensible here.
Any suggestions of ways I can parse out these attributes would be appreciated. Cheers.
回答1:
Use the following XPath expression with the SelectNodes function of an XmlDocument object:
//*[@class="mytag"]
This expression will select any XHTML element whose class attribute's value is equal to "mytag".
If you want to find all elements whose class attribute contains a particular string, the XPath function contains will help you:
//*[contains(@class,"mytag")]
The SelectNodes function returns a list of XML nodes from the XmlDocument corresponding on the XPath expression passed to it as a parameter. Based on your description, it's exactly what you need.
回答2:
If you are OK with LINQ try XML literals,
Like this:
Dim nodes = From currentNode In XmlDoc...<your-node-name>
For Each node As XElement In nodes
Console.Writeline(node.Attribute("attr-name").Value())
Next
来源：https://stackoverflow.com/questions/1471307/vb-net-xml-parser-find-elements-with-specific-attribute-value