Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / Generic / Comparer.cs / 1305376 / Comparer.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics.Contracts; //using System.Globalization; using System.Runtime.CompilerServices; namespace System.Collections.Generic { [Serializable] [TypeDependencyAttribute("System.Collections.Generic.GenericComparer`1")] public abstract class Comparer: IComparer, IComparer { static Comparer defaultComparer; public static Comparer Default { [System.Security.SecuritySafeCritical] // auto-generated get { Contract.Ensures(Contract.Result >() != null); Comparer comparer = defaultComparer; if (comparer == null) { comparer = CreateComparer(); defaultComparer = comparer; } return comparer; } } [System.Security.SecuritySafeCritical] // auto-generated private static Comparer CreateComparer() { RuntimeType t = (RuntimeType)typeof(T); // If T implements IComparable return a GenericComparer if (typeof(IComparable ).IsAssignableFrom(t)) { //return (Comparer )Activator.CreateInstance(typeof(GenericComparer<>).MakeGenericType(t)); return (Comparer )RuntimeTypeHandle.CreateInstanceForAnotherGenericParameter((RuntimeType)typeof(GenericComparer ), t); } // If T is a Nullable where U implements IComparable return a NullableComparer if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)) { RuntimeType u = (RuntimeType)t.GetGenericArguments()[0]; if (typeof(IComparable<>).MakeGenericType(u).IsAssignableFrom(u)) { //return (Comparer )Activator.CreateInstance(typeof(NullableComparer<>).MakeGenericType(u)); return (Comparer )RuntimeTypeHandle.CreateInstanceForAnotherGenericParameter((RuntimeType)typeof(NullableComparer ), u); } } // Otherwise return an ObjectComparer return new ObjectComparer (); } public abstract int Compare(T x, T y); int IComparer.Compare(object x, object y) { if (x == null) return y == null ? 0 : -1; if (y == null) return 1; if (x is T && y is T) return Compare((T)x, (T)y); ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidArgumentForComparison); return 0; } } [Serializable] internal class GenericComparer : Comparer where T: IComparable { public override int Compare(T x, T y) { if (x != null) { if (y != null) return x.CompareTo(y); return 1; } if (y != null) return -1; return 0; } // Equals method for the comparer itself. public override bool Equals(Object obj){ GenericComparer comparer = obj as GenericComparer ; return comparer != null; } public override int GetHashCode() { return this.GetType().Name.GetHashCode(); } } [Serializable] internal class NullableComparer : Comparer > where T : struct, IComparable { public override int Compare(Nullable x, Nullable y) { if (x.HasValue) { if (y.HasValue) return x.value.CompareTo(y.value); return 1; } if (y.HasValue) return -1; return 0; } // Equals method for the comparer itself. public override bool Equals(Object obj){ NullableComparer comparer = obj as NullableComparer ; return comparer != null; } public override int GetHashCode() { return this.GetType().Name.GetHashCode(); } } [Serializable] internal class ObjectComparer : Comparer { public override int Compare(T x, T y) { return System.Collections.Comparer.Default.Compare(x, y); } // Equals method for the comparer itself. public override bool Equals(Object obj){ ObjectComparer comparer = obj as ObjectComparer ; return comparer != null; } public override int GetHashCode() { return this.GetType().Name.GetHashCode(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HMACRIPEMD160.cs
- MatrixTransform3D.cs
- CompressStream.cs
- CapiSafeHandles.cs
- DbParameterHelper.cs
- ReaderWriterLockWrapper.cs
- SqlProcedureAttribute.cs
- MetadataArtifactLoader.cs
- DispatcherTimer.cs
- sqlcontext.cs
- EncodingNLS.cs
- WeakReferenceKey.cs
- JoinSymbol.cs
- RefreshEventArgs.cs
- CapiSymmetricAlgorithm.cs
- TableLayout.cs
- SystemIPInterfaceStatistics.cs
- InvalidPipelineStoreException.cs
- ExportOptions.cs
- RepeatBehaviorConverter.cs
- DocumentEventArgs.cs
- ColorDialog.cs
- SmiMetaDataProperty.cs
- IApplicationTrustManager.cs
- IsolatedStorageFile.cs
- SmtpMail.cs
- ExpressionBindingCollection.cs
- IncrementalCompileAnalyzer.cs
- base64Transforms.cs
- IndependentAnimationStorage.cs
- CapabilitiesAssignment.cs
- GenericUriParser.cs
- IdnElement.cs
- NetStream.cs
- ConfigXmlCDataSection.cs
- FloatUtil.cs
- SmtpFailedRecipientException.cs
- Pen.cs
- ToolZone.cs
- HttpApplicationFactory.cs
- MaskDescriptors.cs
- RangeExpression.cs
- SudsWriter.cs
- ToolStripItem.cs
- XmlMessageFormatter.cs
- TextSerializer.cs
- Icon.cs
- DatePicker.cs
- ResXFileRef.cs
- DesignerPerfEventProvider.cs
- DependencyObjectCodeDomSerializer.cs
- HtmlEncodedRawTextWriter.cs
- MetafileHeaderWmf.cs
- DependencyObjectProvider.cs
- ColumnCollectionEditor.cs
- SymbolType.cs
- DefaultProxySection.cs
- ThrowHelper.cs
- DataFieldEditor.cs
- GridEntryCollection.cs
- GenericAuthenticationEventArgs.cs
- CollaborationHelperFunctions.cs
- Soap11ServerProtocol.cs
- Vector3DAnimation.cs
- HttpRequest.cs
- Ops.cs
- XmlSchemaComplexContentExtension.cs
- SimpleHandlerBuildProvider.cs
- Tracking.cs
- DataColumnChangeEvent.cs
- DescendantOverDescendantQuery.cs
- EventProviderWriter.cs
- TreeViewEvent.cs
- HealthMonitoringSectionHelper.cs
- FileLevelControlBuilderAttribute.cs
- PropertyPath.cs
- brushes.cs
- RepeatInfo.cs
- CodeMemberProperty.cs
- HttpProfileGroupBase.cs
- DecoratedNameAttribute.cs
- TextServicesHost.cs
- NGCPageContentSerializerAsync.cs
- ToolStripItem.cs
- SafeCryptoHandles.cs
- SplashScreenNativeMethods.cs
- InfoCardAsymmetricCrypto.cs
- RectangleF.cs
- DateTimeOffset.cs
- WebPartTransformerAttribute.cs
- SettingsProviderCollection.cs
- DataGridCell.cs
- NameSpaceExtractor.cs
- AnnouncementEndpointElement.cs
- Listen.cs
- ElementsClipboardData.cs
- ActivityDefaults.cs
- SafeNativeMemoryHandle.cs
- HttpDictionary.cs
- MessageLoggingElement.cs