System.Xml.Xsl.XsltOld.XsltCompileContext.XsltFunctionImpl.ToIterator C# (CSharp) Method

            public static XPathNodeIterator ToIterator(object argument) {
                XPathNodeIterator it = argument as XPathNodeIterator;
                if(it == null) {
                    throw XsltException.Create(Res.Xslt_NoNodeSetConversion);
                }
                return it;
            }