Taking this simplifed example of my XML:
<?xml version="1.0"?>
<message xmlns="http://www.mydomain.com/MyDataFeed" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mydomain.com/MyDataFeed https://secure.mydomain/MyDataFeed/myDataFeed.xsd" requestId="13898" status="1">
<error>Invalid Login</error>
</message>
I am trying to select the 'error' node using SelectSingleNode method, however using the following code it always returns NULL?
XmlNode errorNode = oss.SelectSingleNode("/message/error");
if (errorNode != null)
Console.Writeline("There is an error");
From research I have done this is related to namespaces but I simply can't get anything to work. Any advice?
You're missing the XML namespace defined by the <message>
node in your SelectSingleNode
call. Assuming oss
is an XmlDocument
instance, you need to do this:
XmlNamespaceManager nsMgr = new XmlNamespaceManager(oss.NameTable);
nsMgr.AddNamespace("ns", "http://www.mydomain.com/MyDataFeed");
XmlNode errorNode = oss.SelectSingleNode("/ns:message/ns:error", nsMgr);
Marc
来源:https://stackoverflow.com/questions/1766254/selectsinglenode-always-returns-null