需要命名空间管理器或 XsltContext。 此查询具有前缀、变量或用户定义的函数

Question

I am trying to call SelectNode from XmlDocument class and trouble due to this error:

Namespace Manager or XsltContext needed. This query has a prefix, variable, or user-defined function.

My code:

   public void Add(ref XmlDocument xmlFormat, String strName)
   {
        XmlDocument dom;
        XSLTemplate xsl = null;
        String strPath = "";
        XmlNodeList nl;
        XmlAttribute na;
        int n;

        nl = (XmlNodeList)xmlFormat.SelectNodes("//xsl:import/@href",nsm);
    }

and xsl:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:import href="stylesheets/r_adresetiket.xsl" />
    <xsl:template match="/">
        <xsl:call-template name="retouradres">
            <xsl:with-param name="_retouradres" select="data/adresetiket/_retouradres" />
            <xsl:with-param name="minofdir" select="data/adresetiket/afzendgegevens/afzendgegevens" />
            <xsl:with-param name="checked" select="data/adresetiket/LB" />
        </xsl:call-template>
    </xsl:template>
</xsl:stylesheet>

Answer 1

You have to add xsl namespace to XmlNamespaceManager :

var document = new XmlDocument();
document.Load(...);
var nsmgr = new XmlNamespaceManager(document.NameTable);
nsmgr.AddNamespace("xsl", "http://www.w3.org/1999/XSL/Transform");

var nl = document.SelectNodes("//xsl:import/@href", nsmgr);

Answer 2

The document can be traversed by GetElementsByTagName and it doesn't necessarily need using XmlNamespaceManager :

var nodes = document.GetElementsByTagName("xsl:import");
var href =  nodes[0].Attributes["href"];

Fiddle

Answer 3

var document = new XmlDocument();
document.LoadXml(rawData);

var nsmgr = new XmlNamespaceManager(document.NameTable);
nsmgr.AddNamespace("cbc", "urn:xxx"); //for example
nsmgr.AddNamespace("cac", "urn:yyy");            

XmlElement xmlElem = document.DocumentElement;
var node = xmlElem.SelectSingleNode("cac:AccountingSupplierParty/cac:Party/cac:PartyIdentification/cbc:ID[@schemeID='VKN']/text()", nsmgr);
var nodeText = node.InnerText;

All namespaces that will be used in XML should be added.
Then you can access the values of the relevant nodes using xpath .