Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / clr / src / BCL / System / Collections / Generic / Comparer.cs / 1 / Comparer.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; using System.Collections; using System.Collections.Generic; namespace System.Collections.Generic { using System.Globalization; using System.Runtime.CompilerServices; [Serializable()] [TypeDependencyAttribute("System.Collections.Generic.GenericComparer`1")] public abstract class Comparer: IComparer, IComparer { static Comparer defaultComparer; public static Comparer Default { get { Comparer comparer = defaultComparer; if (comparer == null) { comparer = CreateComparer(); defaultComparer = comparer; } return comparer; } } private static Comparer CreateComparer() { Type t = typeof(T); // If T implements IComparable return a GenericComparer if (typeof(IComparable ).IsAssignableFrom(t)) { //return (Comparer )Activator.CreateInstance(typeof(GenericComparer<>).MakeGenericType(t)); return (Comparer )(typeof(GenericComparer ).TypeHandle.CreateInstanceForAnotherGenericParameter(t)); } // If T is a Nullable where U implements IComparable return a NullableComparer if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)) { Type u = t.GetGenericArguments()[0]; if (typeof(IComparable<>).MakeGenericType(u).IsAssignableFrom(u)) { //return (Comparer )Activator.CreateInstance(typeof(NullableComparer<>).MakeGenericType(u)); return (Comparer )(typeof(NullableComparer ).TypeHandle.CreateInstanceForAnotherGenericParameter(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. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== using System; using System.Collections; using System.Collections.Generic; namespace System.Collections.Generic { using System.Globalization; using System.Runtime.CompilerServices; [Serializable()] [TypeDependencyAttribute("System.Collections.Generic.GenericComparer`1")] public abstract class Comparer : IComparer, IComparer { static Comparer defaultComparer; public static Comparer Default { get { Comparer comparer = defaultComparer; if (comparer == null) { comparer = CreateComparer(); defaultComparer = comparer; } return comparer; } } private static Comparer CreateComparer() { Type t = typeof(T); // If T implements IComparable return a GenericComparer if (typeof(IComparable ).IsAssignableFrom(t)) { //return (Comparer )Activator.CreateInstance(typeof(GenericComparer<>).MakeGenericType(t)); return (Comparer )(typeof(GenericComparer ).TypeHandle.CreateInstanceForAnotherGenericParameter(t)); } // If T is a Nullable where U implements IComparable return a NullableComparer if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)) { Type u = t.GetGenericArguments()[0]; if (typeof(IComparable<>).MakeGenericType(u).IsAssignableFrom(u)) { //return (Comparer )Activator.CreateInstance(typeof(NullableComparer<>).MakeGenericType(u)); return (Comparer )(typeof(NullableComparer ).TypeHandle.CreateInstanceForAnotherGenericParameter(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
- SplitterEvent.cs
- ListManagerBindingsCollection.cs
- TextMarkerSource.cs
- SafeArrayRankMismatchException.cs
- RegisteredScript.cs
- UserNamePasswordValidator.cs
- PluralizationServiceUtil.cs
- SystemInformation.cs
- DefaultMemberAttribute.cs
- AuthenticationManager.cs
- Renderer.cs
- CookieParameter.cs
- Cursor.cs
- TranslateTransform.cs
- SingleStorage.cs
- LinkedResource.cs
- SqlVisitor.cs
- CompilerGlobalScopeAttribute.cs
- RequestStatusBarUpdateEventArgs.cs
- TargetException.cs
- XmlSchemaAttribute.cs
- SaveLedgerEntryRequest.cs
- Types.cs
- DataBinding.cs
- TextContainer.cs
- SqlConnectionManager.cs
- NumericExpr.cs
- TdsRecordBufferSetter.cs
- MimeTypeMapper.cs
- LiteralControl.cs
- IconBitmapDecoder.cs
- Cursor.cs
- RestHandlerFactory.cs
- IntegerFacetDescriptionElement.cs
- WebControlsSection.cs
- DependencyPropertyKind.cs
- SqlDataSourceCache.cs
- PartDesigner.cs
- PointHitTestResult.cs
- SharedDp.cs
- PlainXmlWriter.cs
- ProgressBarBrushConverter.cs
- TableLayoutStyle.cs
- PersonalizationState.cs
- TagPrefixInfo.cs
- ManagementPath.cs
- StreamWriter.cs
- XmlHierarchicalEnumerable.cs
- TextEditor.cs
- SID.cs
- FreezableCollection.cs
- EmptyEnumerator.cs
- HttpResponseHeader.cs
- StreamGeometry.cs
- X509WindowsSecurityToken.cs
- ClientSettingsStore.cs
- EncoderParameters.cs
- BitmapVisualManager.cs
- DataSvcMapFile.cs
- ExclusiveCanonicalizationTransform.cs
- OleDbConnectionFactory.cs
- UIPermission.cs
- AudioFileOut.cs
- Missing.cs
- MSAANativeProvider.cs
- ThicknessKeyFrameCollection.cs
- InertiaTranslationBehavior.cs
- shaper.cs
- ComponentResourceKey.cs
- Encoder.cs
- AutomationPatternInfo.cs
- Parser.cs
- FileRegion.cs
- DoubleAnimationUsingPath.cs
- SqlConnectionString.cs
- UriScheme.cs
- Completion.cs
- WmlListAdapter.cs
- PropertyItemInternal.cs
- SplitContainerDesigner.cs
- Registry.cs
- SettingsProviderCollection.cs
- ExpandButtonVisibilityConverter.cs
- UserMapPath.cs
- EntityPropertyMappingAttribute.cs
- DataGridItemAutomationPeer.cs
- JulianCalendar.cs
- TreeIterators.cs
- PropertyMetadata.cs
- SafeRegistryHandle.cs
- SynchronizationLockException.cs
- Matrix3DValueSerializer.cs
- ContentType.cs
- GradientStopCollection.cs
- SqlCommand.cs
- HandoffBehavior.cs
- SrgsRulesCollection.cs
- XmlIterators.cs
- FlowDocumentPageViewerAutomationPeer.cs
- FormatterConverter.cs