System.Xml.Xsl.XsltOld.NumberAction.checkFrom C# (CSharp) Method

        private bool checkFrom(Processor processor, XPathNavigator nav) {
            if(this.fromKey == Compiler.InvalidQueryKey) {
                return true;
            }
            do {
                if (processor.Matches(nav, this.fromKey)) {
                    return true;
                }
            }while (nav.MoveToParent());
            return false;
        }