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

            public static double ToNumber(object argument) {
                XPathNodeIterator it = argument as XPathNodeIterator;
                if (it != null) {
                    return XmlConvert.ToXPathDouble(IteratorToString(it));
                }
                XPathNavigator nav = argument as XPathNavigator;
                if (nav != null) {
                    return XmlConvert.ToXPathDouble(nav.ToString());
                }
                return XmlConvert.ToXPathDouble(argument);
            }