Question
How can I select any element by class/name using xpath?
var nodeByClass = doc.DocumentNode.SelectSingleNode("//[@class='class_name']");
var nodeName = doc.DocumentNode.SelectSingleNode("//[@name='element_name']");
I got a exception
The expression must be evaluated for a set of nodes.
Popular Answer
You're missing a location step after the //, as the predicate on its own is not allowed.
var nodeByClass = doc.DocumentNode.SelectSingleNode("//*[@class='class_name']");
var nodeName = doc.DocumentNode.SelectSingleNode("//*[@name='element_name']");
short-hand for:
var nodeByClass = doc.DocumentNode.SelectSingleNode("//self::node()[@class='class_name']");
var nodeName = doc.DocumentNode.SelectSingleNode("//self::node()[@name='element_name']");
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