Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / XPathNodeIterator.cs / 2 / XPathNodeIterator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Xml.XPath { using System; using System.Collections; using System.Diagnostics; using System.Text; [DebuggerDisplay("Position={CurrentPosition}, Current={debuggerDisplayProxy}")] public abstract class XPathNodeIterator : ICloneable, IEnumerable { internal int count = -1; object ICloneable.Clone() { return this.Clone(); } public abstract XPathNodeIterator Clone(); public abstract bool MoveNext(); public abstract XPathNavigator Current { get; } public abstract int CurrentPosition { get; } public virtual int Count { get { if (count == -1) { XPathNodeIterator clone = this.Clone(); while(clone.MoveNext()) ; count = clone.CurrentPosition; } return count; } } public virtual IEnumerator GetEnumerator() { return new Enumerator(this); } private object debuggerDisplayProxy { get { return Current == null ? null : (object)new XPathNavigator.DebuggerDisplayProxy(Current); } } ////// Implementation of a resetable enumerator that is linked to the XPathNodeIterator used to create it. /// private class Enumerator : IEnumerator { private XPathNodeIterator original; // Keep original XPathNodeIterator in case Reset() is called private XPathNodeIterator current; private bool iterationStarted; public Enumerator(XPathNodeIterator original) { this.original = original.Clone(); } public virtual object Current { get { // 1. Do not reuse the XPathNavigator, as we do in XPathNodeIterator // 2. Throw exception if current position is before first node or after the last node if (this.iterationStarted) { // Current is null if iterator is positioned after the last node if (this.current == null) throw new InvalidOperationException(Res.GetString(Res.Sch_EnumFinished, string.Empty)); return this.current.Current.Clone(); } // User must call MoveNext before accessing Current property throw new InvalidOperationException(Res.GetString(Res.Sch_EnumNotStarted, string.Empty)); } } public virtual bool MoveNext() { // Delegate to XPathNodeIterator if (!this.iterationStarted) { // Reset iteration to original position this.current = this.original.Clone(); this.iterationStarted = true; } if (this.current == null || !this.current.MoveNext()) { // Iteration complete this.current = null; return false; } return true; } public virtual void Reset() { this.iterationStarted = false; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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