Code:
/ FX-1434 / FX-1434 / 1.0 / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- RoutedPropertyChangedEventArgs.cs
- DataService.cs
- ClosableStream.cs
- NumberSubstitution.cs
- SignedXml.cs
- UICuesEvent.cs
- NamedPermissionSet.cs
- DataGridViewSortCompareEventArgs.cs
- SafeViewOfFileHandle.cs
- Comparer.cs
- DependencyPropertyValueSerializer.cs
- PerformanceCounterLib.cs
- RepeaterItemEventArgs.cs
- ErrorHandler.cs
- RelationshipFixer.cs
- WinHttpWebProxyFinder.cs
- Section.cs
- FlowDocument.cs
- SelectionList.cs
- X500Name.cs
- ExceptionUtil.cs
- RadioButton.cs
- DataMemberConverter.cs
- webclient.cs
- AccessorTable.cs
- TreeViewCancelEvent.cs
- ObjectListGeneralPage.cs
- TcpConnectionPoolSettings.cs
- ExpressionNode.cs
- HttpAsyncResult.cs
- PolyBezierSegment.cs
- AttachedAnnotationChangedEventArgs.cs
- MouseButtonEventArgs.cs
- CommandDevice.cs
- CommandBindingCollection.cs
- SpellerStatusTable.cs
- DataGridViewDataConnection.cs
- ServiceHttpModule.cs
- ClientRuntimeConfig.cs
- XmlNavigatorFilter.cs
- XPathAncestorIterator.cs
- XPathParser.cs
- SvcMapFileSerializer.cs
- VariableExpressionConverter.cs
- WindowsRegion.cs
- FlagsAttribute.cs
- NodeFunctions.cs
- mda.cs
- JapaneseLunisolarCalendar.cs
- TextContainer.cs
- OleDbFactory.cs
- WebBrowserSiteBase.cs
- DrawListViewColumnHeaderEventArgs.cs
- SchemaTypeEmitter.cs
- ProxyOperationRuntime.cs
- SafeFileMappingHandle.cs
- SqlCommandSet.cs
- StoryFragments.cs
- SeekableReadStream.cs
- AmbientValueAttribute.cs
- XmlSchemaInferenceException.cs
- FilteredXmlReader.cs
- FilterQuery.cs
- SkewTransform.cs
- PrintController.cs
- ButtonBase.cs
- HttpResponseInternalBase.cs
- MessageSmuggler.cs
- Panel.cs
- MissingFieldException.cs
- ClientOptions.cs
- AssemblyResourceLoader.cs
- ObjectStateManager.cs
- TextContainer.cs
- ClientConfigurationSystem.cs
- CheckPair.cs
- FontWeights.cs
- CodeTypeReferenceExpression.cs
- Simplifier.cs
- ColumnMapCopier.cs
- LinkedResource.cs
- TextBoxRenderer.cs
- Oci.cs
- RefreshPropertiesAttribute.cs
- VirtualizingPanel.cs
- PlainXmlWriter.cs
- ImageAnimator.cs
- PageContent.cs
- Relationship.cs
- ProxyManager.cs
- InvariantComparer.cs
- BindingGroup.cs
- SplitterEvent.cs
- GridViewCommandEventArgs.cs
- FileSystemEventArgs.cs
- TranslateTransform3D.cs
- EntityFunctions.cs
- SchemaCollectionCompiler.cs
- Expression.cs
- DataTemplateKey.cs