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

            public static object ConvertToXPathType(object val, XPathResultType xt, TypeCode typeCode) {
                switch(xt) {
                case XPathResultType.String    :
                    if (typeCode == TypeCode.String) {
                        return ToString(val);
                    } else {
                        return ToNavigator(val);
                    }
                case XPathResultType.Number    : return ToNumeric(val, typeCode);
                case XPathResultType.Boolean   : return ToBoolean(val);
                case XPathResultType.NodeSet   : return ToIterator(val);
//                case XPathResultType.Navigator : return ToNavigator(val);
                case XPathResultType.Any       :
                case XPathResultType.Error     :
                    return val;
                default :
                    Debug.Assert(false, "unexpected XPath type");
                    return val;
                }
            }
        }