System.Xml.Xsl.Runtime.XPathPrecedingDocOrderIterator.MoveNext C# (CSharp) Method

        public bool MoveNext() {
            if (!this.navStack.IsEmpty) {
                while (true) {
                    // Move to the next matching node that is before the top node on the stack in document order
                    if (this.filter.MoveToFollowing(this.navCurrent, this.navStack.Peek()))
                        // Found match
                        return true;

                    // Do not include ancestor nodes as part of the preceding axis
                    this.navCurrent.MoveTo(this.navStack.Pop());

                    // No more preceding matches possible
                    if (this.navStack.IsEmpty)
                        break;
                }
            }

            return false;
        }

        /// <summary>
        /// Initialize the XPathPrecedingIterator (no possibility of duplicates).
        /// </summary>
        public void Create(XPathNavigator context, XmlNavigatorFilter filter)
        {
            XPathPrecedingDocOrderIterator wrapped = new XPathPrecedingDocOrderIterator();

            wrapped.Create(context, filter);

            // Fetch all preceding nodes in document order and push them onto the stack
            while (wrapped.MoveNext())
            {
                stack.Push(wrapped.Current.Clone());
            }
        }