Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / 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(); } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HashSetDebugView.cs
- DbConnectionOptions.cs
- DeferredTextReference.cs
- DocumentOrderComparer.cs
- MethodBuilderInstantiation.cs
- SchemaElementDecl.cs
- ContainerParaClient.cs
- XmlSchemaRedefine.cs
- XmlFormatExtensionPrefixAttribute.cs
- BitmapEffectInput.cs
- WebControl.cs
- HttpModuleAction.cs
- WorkflowServiceOperationListItem.cs
- WpfSharedBamlSchemaContext.cs
- ItemCheckEvent.cs
- SpecialNameAttribute.cs
- XmlCountingReader.cs
- TimeSpanSecondsConverter.cs
- XmlSchemaException.cs
- CursorConverter.cs
- ButtonBaseAutomationPeer.cs
- OracleDataReader.cs
- StrongNameUtility.cs
- PolyLineSegmentFigureLogic.cs
- FixedSOMPageElement.cs
- WindowsTab.cs
- OneToOneMappingSerializer.cs
- WebPartManagerInternals.cs
- TextTreePropertyUndoUnit.cs
- BindingManagerDataErrorEventArgs.cs
- ThemeInfoAttribute.cs
- COM2ExtendedUITypeEditor.cs
- _Win32.cs
- FixedFindEngine.cs
- VirtualDirectoryMappingCollection.cs
- GPStream.cs
- PreservationFileWriter.cs
- WebSysDefaultValueAttribute.cs
- ConditionalExpression.cs
- ThreadAbortException.cs
- TextParentUndoUnit.cs
- SecondaryIndex.cs
- StateManagedCollection.cs
- EncodingNLS.cs
- InputBuffer.cs
- DataGridViewCellStyle.cs
- Rfc4050KeyFormatter.cs
- TextRangeEditLists.cs
- QuaternionAnimationBase.cs
- SmtpException.cs
- StringCollection.cs
- OptimizedTemplateContentHelper.cs
- safex509handles.cs
- TemplatePropertyEntry.cs
- TaskResultSetter.cs
- SelectionChangedEventArgs.cs
- AssemblyAttributes.cs
- CommandEventArgs.cs
- DiscoveryDocumentReference.cs
- WorkflowViewManager.cs
- LeftCellWrapper.cs
- Pen.cs
- IdentityManager.cs
- GridViewSortEventArgs.cs
- CheckBox.cs
- ModelItemCollection.cs
- AnnotationAdorner.cs
- StylusPlugin.cs
- CatalogZoneBase.cs
- Sentence.cs
- Function.cs
- DesignerActionPanel.cs
- Vector3dCollection.cs
- AddInToken.cs
- AuthenticateEventArgs.cs
- Typeface.cs
- CLSCompliantAttribute.cs
- metadatamappinghashervisitor.cs
- mactripleDES.cs
- ZipIOExtraFieldZip64Element.cs
- SettingsContext.cs
- OracleFactory.cs
- EntityDataSourceContextDisposingEventArgs.cs
- FormsAuthenticationUser.cs
- PathFigureCollectionConverter.cs
- PagePropertiesChangingEventArgs.cs
- TreeNodeSelectionProcessor.cs
- ListControl.cs
- AxHost.cs
- FrameworkTextComposition.cs
- SchemaAttDef.cs
- FlowNode.cs
- ConstraintEnumerator.cs
- X509ThumbprintKeyIdentifierClause.cs
- AuthenticateEventArgs.cs
- Resources.Designer.cs
- TextStore.cs
- Token.cs
- MatrixTransform3D.cs
- WebPartConnectionsConfigureVerb.cs