System.Xml.DocumentXPathNavigator.MoveToPrevious C# (CSharp) Méthode

        public override bool MoveToPrevious() {
            XmlNode sibling = PreviousSibling(source);
            if (sibling == null) {
                return false;
            }
            if (sibling.IsText) {
                if (source.IsText) {
                    sibling = PreviousSibling(TextStart(sibling));
                    if (sibling == null) {
                        return false;
                    }
                }
                else {
                    sibling = TextStart(sibling);
                }
            }
            XmlNode parent = ParentNode(sibling);
            Debug.Assert(parent != null);
            while (!IsValidChild(parent, sibling)) {
                sibling = PreviousSibling(sibling);
                if (sibling == null) {
                    return false;
                }
                // if (sibling.IsText) {
                //     sibling = TextStart(sibling);
                // }
            }
            source = sibling;
            return true;
        }