Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / StringComparer.cs / 1 / StringComparer.cs
namespace System { using System.Collections; using System.Collections.Generic; using System.Globalization; [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public abstract class StringComparer : IComparer, IEqualityComparer, IComparer, IEqualityComparer { private static StringComparer _invariantCulture = new CultureAwareComparer(CultureInfo.InvariantCulture, false); private static StringComparer _invariantCultureIgnoreCase = new CultureAwareComparer(CultureInfo.InvariantCulture, true); private static StringComparer _ordinal = new OrdinalComparer(false); private static StringComparer _ordinalIgnoreCase = new OrdinalComparer(true); public static StringComparer InvariantCulture { get { return _invariantCulture; } } public static StringComparer InvariantCultureIgnoreCase { get { return _invariantCultureIgnoreCase; } } public static StringComparer CurrentCulture { get { return new CultureAwareComparer(CultureInfo.CurrentCulture, false); } } public static StringComparer CurrentCultureIgnoreCase { get { return new CultureAwareComparer(CultureInfo.CurrentCulture, true); } } public static StringComparer Ordinal { get { return _ordinal; } } public static StringComparer OrdinalIgnoreCase { get { return _ordinalIgnoreCase; } } public static StringComparer Create(CultureInfo culture, bool ignoreCase) { if( culture == null) { throw new ArgumentNullException("culture"); } return new CultureAwareComparer(culture, ignoreCase); } public int Compare(object x, object y) { if (x == y) return 0; if (x == null) return -1; if (y == null) return 1; String sa = x as String; if (sa != null) { String sb = y as String; if( sb != null) { return Compare(sa, sb); } } IComparable ia = x as IComparable; if (ia != null) { return ia.CompareTo(y); } throw new ArgumentException(Environment.GetResourceString("Argument_ImplementIComparable")); } public new bool Equals(Object x, Object y) { if (x == y) return true; if (x == null || y == null) return false; String sa = x as String; if (sa != null) { String sb = y as String; if( sb != null) { return Equals(sa, sb); } } return x.Equals(y); } public int GetHashCode(object obj) { if( obj == null) { throw new ArgumentNullException("obj"); } string s = obj as string; if( s != null) { return GetHashCode(s); } return obj.GetHashCode(); } public abstract int Compare(String x, String y); public abstract bool Equals(String x, String y); public abstract int GetHashCode(string obj); } [Serializable()] internal sealed class CultureAwareComparer : StringComparer { private CompareInfo _compareInfo; private bool _ignoreCase; internal CultureAwareComparer(CultureInfo culture, bool ignoreCase) { _compareInfo = culture.CompareInfo; _ignoreCase = ignoreCase; } public override int Compare(string x, string y) { if (Object.ReferenceEquals(x, y)) return 0; if (x == null) return -1; if (y == null) return 1; return _compareInfo.Compare(x, y, _ignoreCase? CompareOptions.IgnoreCase : CompareOptions.None); } public override bool Equals(string x, string y) { if (Object.ReferenceEquals(x ,y)) return true; if (x == null || y == null) return false; return (_compareInfo.Compare(x, y, _ignoreCase? CompareOptions.IgnoreCase : CompareOptions.None) == 0); } public override int GetHashCode(string obj) { if( obj == null) { throw new ArgumentNullException("obj"); } if( _ignoreCase) { return _compareInfo.GetHashCodeOfString(obj, CompareOptions.IgnoreCase); } return _compareInfo.GetHashCodeOfString(obj, CompareOptions.None); } // Equals method for the comparer itself. public override bool Equals(Object obj){ CultureAwareComparer comparer = obj as CultureAwareComparer; if( comparer == null) { return false; } return (this._ignoreCase == comparer._ignoreCase) && ( this._compareInfo.Equals(comparer._compareInfo)); } public override int GetHashCode() { int hashCode = _compareInfo.GetHashCode() ; return _ignoreCase ? (~hashCode) : hashCode; } } // Provide x more optimal implementation of ordinal comparison. [Serializable()] internal sealed class OrdinalComparer : StringComparer { private bool _ignoreCase; internal OrdinalComparer(bool ignoreCase) { _ignoreCase = ignoreCase; } public override int Compare(string x, string y) { if (Object.ReferenceEquals(x, y)) return 0; if (x == null) return -1; if (y == null) return 1; if( _ignoreCase) { return TextInfo.CompareOrdinalIgnoreCase(x, y); } return String.CompareOrdinal(x, y); } public override bool Equals(string x, string y) { if (Object.ReferenceEquals(x ,y)) return true; if (x == null || y == null) return false; if( _ignoreCase) { if( x.Length != y.Length) { return false; } return (TextInfo.CompareOrdinalIgnoreCase(x, y) == 0); } return x.Equals(y); } public override int GetHashCode(string obj) { if( obj == null) { throw new ArgumentNullException("obj"); } if( _ignoreCase) { return TextInfo.GetHashCodeOrdinalIgnoreCase(obj); } return obj.GetHashCode(); } // Equals method for the comparer itself. public override bool Equals(Object obj){ OrdinalComparer comparer = obj as OrdinalComparer; if( comparer == null) { return false; } return (this._ignoreCase == comparer._ignoreCase); } public override int GetHashCode() { string name = "OrdinalComparer"; int hashCode = name.GetHashCode(); return _ignoreCase ? (~hashCode) : hashCode; } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- EpmSyndicationContentSerializer.cs
- TreeNodeStyleCollection.cs
- TraceSection.cs
- SamlAdvice.cs
- FormDocumentDesigner.cs
- ActivityStateQuery.cs
- Relationship.cs
- FlatButtonAppearance.cs
- EtwTrace.cs
- ObjectDataSourceSelectingEventArgs.cs
- DesignColumn.cs
- OverflowException.cs
- InternalSafeNativeMethods.cs
- RepeaterItemCollection.cs
- InternalTypeHelper.cs
- EventSetter.cs
- Update.cs
- BitmapImage.cs
- RequestCacheManager.cs
- userdatakeys.cs
- X500Name.cs
- OdbcPermission.cs
- CompilationSection.cs
- CodeAttributeDeclarationCollection.cs
- LocalIdKeyIdentifierClause.cs
- SizeChangedInfo.cs
- FlowDocumentPage.cs
- TableItemStyle.cs
- CollectionBase.cs
- AssemblyBuilder.cs
- DatatypeImplementation.cs
- SafePEFileHandle.cs
- sqlstateclientmanager.cs
- FilteredDataSetHelper.cs
- XmlSequenceWriter.cs
- Brush.cs
- TextViewBase.cs
- TriggerActionCollection.cs
- Predicate.cs
- AspNetSynchronizationContext.cs
- SubpageParagraph.cs
- ProbeMatchesMessageCD1.cs
- ButtonColumn.cs
- MessagePartProtectionMode.cs
- RemotingConfigParser.cs
- StateMachineDesignerPaint.cs
- ResourceAssociationType.cs
- RenderCapability.cs
- TextChange.cs
- OleDbTransaction.cs
- PerformanceCounterPermission.cs
- ValidatorAttribute.cs
- SspiNegotiationTokenProvider.cs
- SemanticAnalyzer.cs
- SystemColors.cs
- FileIOPermission.cs
- WCFBuildProvider.cs
- TimeSpanConverter.cs
- DataContractJsonSerializer.cs
- EnumType.cs
- TextDecorations.cs
- Subset.cs
- ContextMenuService.cs
- PropertyGridEditorPart.cs
- Label.cs
- RsaSecurityToken.cs
- SQlBooleanStorage.cs
- TextRunCacheImp.cs
- XmlChildEnumerator.cs
- ProfileBuildProvider.cs
- TabItemAutomationPeer.cs
- TypeConverterAttribute.cs
- ResourceReferenceKeyNotFoundException.cs
- SqlAggregateChecker.cs
- HttpCookiesSection.cs
- EntitySqlQueryCacheKey.cs
- HelpKeywordAttribute.cs
- SqlDataSourceQueryConverter.cs
- TextDecoration.cs
- CustomError.cs
- SwitchAttribute.cs
- RemoteCryptoDecryptRequest.cs
- HashAlgorithm.cs
- DeflateInput.cs
- Certificate.cs
- DefaultValueAttribute.cs
- SingleAnimation.cs
- OleDbCommand.cs
- FrameworkContentElement.cs
- DocumentViewerConstants.cs
- ScriptResourceAttribute.cs
- TriggerActionCollection.cs
- ThicknessConverter.cs
- PrinterResolution.cs
- mansign.cs
- ProtocolsConfiguration.cs
- _TLSstream.cs
- SqlCachedBuffer.cs
- PasswordRecovery.cs
- BooleanAnimationUsingKeyFrames.cs