System.Xml.Xsl.XsltOld.XsltCompileContext.FuncGenerateId.Invoke C# (CSharp) Method

            public override object Invoke(XsltContext xsltContext, object[] args, XPathNavigator docContext) {
                if(args.Length > 0) {
                    XPathNodeIterator it = ToIterator(args[0]);
                    if(it.MoveNext()) {
                        return it.Current.UniqueId;
                    } else {
                        // if empty nodeset, return empty string, otherwise return generated id
                        return string.Empty;
                    }
                } else {
                    return docContext.UniqueId;
                }
            }
        }