System.Xml.XmlElementList.Item C# (CSharp) Méthode

        public override XmlNode Item(int index) {
            if ( rootNode == null || index < 0 ) 
                return null;

            if( this.empty == true )
                return null;
            if ( curInd == index )
                return curElem;
            int nDiff = index - curInd;
            bool bForward = ( nDiff > 0 );
            if ( nDiff < 0 )
                nDiff = -nDiff;
            XmlNode node;
            if ( ( node = GetNthMatchingNode( curElem, bForward, nDiff ) ) != null ) {
                curInd = index;
                curElem = node;
                return curElem;
            } 
            return null;
        }