// Function to resolve references to user-defined XPath
// extension variables in XPath query.
public override System.Xml.Xsl.IXsltContextVariable ResolveVariable(
string prefix, string name)
{
if (this.LookupNamespace(prefix) == ExtensionsNamespaceUri || !prefix.Equals(string.Empty))
{
throw new XPathException(string.Format("Variable '{0}:{1}' is not defined.", prefix, name));
}
// Verify name of function is defined.
if (name.Equals("text") || name.Equals("charToCount") ||
name.Equals("right") || name.Equals("left"))
{
// Create an instance of an XPathExtensionVariable
// (custom IXsltContextVariable implementation) object
// by supplying the name of the user-defined variable to resolve.
XPathExtensionVariable var;
var = new XPathExtensionVariable(prefix, name);
// The Evaluate method of the returned object will be used at run time
// to resolve the user-defined variable that is referenced in the XPath
// query expression.
return(var);
}
return(null);
}
// Function to resolve references to user-defined XPath extension variables in XPath query.
public override System.Xml.Xsl.IXsltContextVariable ResolveVariable (string prefix, string name)
{
// Create an instance of an XPathExtensionVariable (custom IXsltContextVariable
// implementation) object by supplying the name of the user-defined variable to resolve.
XPathExtensionVariable Var;
Var = new XPathExtensionVariable (name);
// Return the XPathExtensionVariable object instance that was created. The Evaluate method of the
// returned object will be used at run time to resolve the user-defined variable
// that is referenced in the XPath query expression.
return Var;
}
