MS.Internal.Xml.XPath.Query.GetXPathType C# (CSharp) Метод

        protected XPathResultType GetXPathType(object value) {
            if (value is XPathNodeIterator) return XPathResultType.NodeSet;
            if (value is string           ) return XPathResultType.String;
            if (value is double           ) return XPathResultType.Number;
            if (value is bool             ) return XPathResultType.Boolean;
            Debug.Assert(value is XPathNavigator, "Unknown value type");
            return XPathResultType_Navigator;
        }