Custom XSL funcion with XML parameter

support
1

How to create custom XSL function with parameter of type XML tree. What is the name of type parameter in the function definition? String or something else?

Example:
public string SignMessage(string xml, string blobCert, string password)

Parameter “string xml” contains XML structure.

2

You need to use XpathNavigator type to work with an xml input.

See this example of our NodeSet function implementation:

public static XPathNodeIterator NodeSet(XPathNavigator nav)
{
    XPathNodeIterator result = nav.Select("/");
    return result;
}
3

OK, we change data type to XPathNavigator and return type to XPathNodeIterator. But function still not working.

Cannot convert the operand to ‘Result tree fragment’.
CZ.Advantages.Asap.AsapException: Cannot convert the operand to ‘Result tree fragment’. —> System.Exception: Cannot convert the operand to ‘Result tree fragment’. —> System.Exception: Transformation result invalid. —> System.Xml.XPath.XPathException: Function ‘OR:SignMessage()’ has failed. —> System.Xml.Xsl.XsltException: Cannot convert the operand to ‘Result tree fragment’.
at System.Xml.Xsl.XsltOld.XsltCompileContext.XsltFunctionImpl.ToNavigator(Object argument)
at System.Xml.Xsl.XsltOld.XsltCompileContext.FuncExtension.Invoke(XsltContext xsltContext, Object[] args, XPathNavigator docContext)
at MS.Internal.Xml.XPath.FunctionQuery.Evaluate(XPathNodeIterator nodeIterator)
— End of inner exception stack trace —
at MS.Internal.Xml.XPath.FunctionQuery.Evaluate(XPathNodeIterator nodeIterator)
at System.Xml.Xsl.XsltOld.Processor.RunQuery(ActionFrame context, Int32 key)
at System.Xml.Xsl.XsltOld.VariableAction.Execute(Processor processor, ActionFrame frame)
at System.Xml.Xsl.XsltOld.ActionFrame.Execute(Processor processor)
at System.Xml.Xsl.XsltOld.Processor.Execute()
at System.Xml.Xsl.XsltOld.ReaderOutput.Read()
at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
at System.Xml.XmlDocument.Load(XmlReader reader)
at CZ.Advantages.Asap.Rule.OldXsltEngine.Transform(Object engine, XsltArgumentList xslArg, XPathDocument sourceXpathDoc, XmlDocument resultDoc)
at CZ.Advantages.Asap.Rule.MicrosoftXsltEngine.Transform(XmlDocument data, Object xsltEngine, Hashtable parameters, RuleEngine ruleEngine, IDataStructure outputStructure, Boolean validateOnly)
— End of inner exception stack trace —
at CZ.Advantages.Asap.Rule.MicrosoftXsltEngine.Transform(XmlDocument data, Object xsltEngine, Hashtable parameters, RuleEngine ruleEngine, IDataStructure outputStructure, Boolean validateOnly)
— End of inner exception stack trace —
at CZ.Advantages.Asap.Rule.MicrosoftXsltEngine.Transform(XmlDocument data, Object xsltEngine, Hashtable parameters, RuleEngine ruleEngine, IDataStructure outputStructure, Boolean validateOnly)
at CZ.Advantages.Asap.Rule.AbstractXsltEngine.Transform(XmlDocument data, Guid transformationId, Guid retransformationId, Hashtable parameters, Hashtable retransformationParameters, RuleEngine ruleEngine, IDataStructure outputStructure, Boolean validateOnly)
at CZ.Advantages.Asap.Rule.AbstractXsltEngine.Transform(XmlDocument data, Guid transformationId, Hashtable parameters, RuleEngine ruleEngine, IDataStructure outputStructure, Boolean validateOnly)
at CZ.Advantages.Asap.Workflow.TransformationAgent.Run()
at CZ.Advantages.Asap.Workflow.Tasks.ServiceMethodCallEngineTask.OnExecute()
at CZ.Advantages.Asap.Workflow.Tasks.AbstractWorkflowEngineTask.Execute()
— End of inner exception stack trace —

Some hints?

4

So in your case you need to use XPathNodeIterator as the input parameter type. Or you can use string and use AS:NodeToString() function to convert the XML to string first.