System.Xml.Xsl.Runtime.XmlQueryOutput.CopyNode C# (CSharp) Method

        private void CopyNode(XPathNavigator navigator) {
            XPathNodeType nodeType;
            int depthStart = this.depth;
            Debug.Assert(navigator != null);

            while (true) {
                if (StartCopy(navigator, this.depth == depthStart)) {
                    nodeType = navigator.NodeType;
                    Debug.Assert(nodeType == XPathNodeType.Element, "StartCopy should return true only for Element nodes.");

                    // Copy attributes
                    if (navigator.MoveToFirstAttribute()) {
                        do {
                            StartCopy(navigator, false);
                        }
                        while (navigator.MoveToNextAttribute());
                        navigator.MoveToParent();
                    }

                    // Copy namespaces in document order (navigator returns them in reverse document order)
                    CopyNamespaces(navigator, (this.depth - 1 == depthStart) ? XPathNamespaceScope.ExcludeXml : XPathNamespaceScope.Local);

                    StartElementContentUnchecked();

                    // If children exist, move down to next level
                    if (navigator.MoveToFirstChild())
                        continue;

                    EndCopy(navigator, (this.depth - 1) == depthStart);
                }
                
                // No children
                while (true) {
                    if (this.depth == depthStart) {
                        // The entire subtree has been copied
                        return;
                    }

                    if (navigator.MoveToNext()) {
                        // Found a sibling, so break to outer loop
                        break;
                    }

                    // No siblings, so move up to previous level
                    navigator.MoveToParent();

                    EndCopy(navigator, (this.depth - 1) == depthStart);
                }
            }
        }