System.Xml.DocumentXPathNavigator.SelectDescendants C# (CSharp) Method

        public override XPathNodeIterator SelectDescendants( string localName, string namespaceURI, bool matchSelf ) {
            string nsAtom = document.NameTable.Get( namespaceURI );
            if ( nsAtom == null || this.source.NodeType == XmlNodeType.Attribute )
                return new DocumentXPathNodeIterator_Empty( this );

            Debug.Assert( this.NodeType != XPathNodeType.Attribute && this.NodeType != XPathNodeType.Namespace && this.NodeType != XPathNodeType.All );

            string localNameAtom = document.NameTable.Get( localName );
            if ( localNameAtom == null )
                return new DocumentXPathNodeIterator_Empty( this );

            if ( localNameAtom.Length == 0 ) {
                if ( matchSelf )
                    return new DocumentXPathNodeIterator_ElemChildren_AndSelf_NoLocalName( this, nsAtom );
                return new DocumentXPathNodeIterator_ElemChildren_NoLocalName( this, nsAtom );
            }

            if ( matchSelf )
                return new DocumentXPathNodeIterator_ElemChildren_AndSelf( this, localNameAtom, nsAtom );
            return new DocumentXPathNodeIterator_ElemChildren( this, localNameAtom, nsAtom );
        }