System.Xml.Xsl.XsltOld.XsltCompileContext.XsltFunctionImpl.ToNavigator C# (CSharp) Метод

            public static XPathNavigator ToNavigator(object argument) {
                XPathNavigator nav = argument as XPathNavigator;
                if(nav == null) {
                    throw XsltException.Create(Res.Xslt_NoNavigatorConversion);
                }
                return nav;
            }