Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / Comparer.cs / 1305376 / Comparer.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: Comparer ** **[....] ** ** ** Purpose: Default IComparer implementation. ** ** ===========================================================*/ namespace System.Collections { using System; using System.Globalization; using System.Runtime.Serialization; using System.Security.Permissions; using System.Diagnostics.Contracts; [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public sealed class Comparer : IComparer , ISerializable { private CompareInfo m_compareInfo; public static readonly Comparer Default = new Comparer(CultureInfo.CurrentCulture); public static readonly Comparer DefaultInvariant = new Comparer(CultureInfo.InvariantCulture); private const String CompareInfoName = "CompareInfo"; private Comparer() { m_compareInfo = null; } public Comparer(CultureInfo culture) { if (culture==null) { throw new ArgumentNullException("culture"); } Contract.EndContractBlock(); m_compareInfo = culture.CompareInfo; } private Comparer(SerializationInfo info, StreamingContext context) { m_compareInfo = null; SerializationInfoEnumerator enumerator = info.GetEnumerator(); while( enumerator.MoveNext()) { switch( enumerator.Name) { case CompareInfoName: m_compareInfo = (CompareInfo) info.GetValue(CompareInfoName, typeof(CompareInfo)); break; } } } // Compares two Objects by calling CompareTo. If a == // b,0 is returned. If a implements // IComparable, a.CompareTo(b) is returned. If a // doesn't implement IComparable and b does, // -(b.CompareTo(a)) is returned, otherwise an // exception is thrown. // public int Compare(Object a, Object b) { if (a == b) return 0; if (a == null) return -1; if (b == null) return 1; if (m_compareInfo != null) { String sa = a as String; String sb = b as String; if (sa != null && sb != null) return m_compareInfo.Compare(sa, sb); } IComparable ia = a as IComparable; if (ia != null) return ia.CompareTo(b); throw new ArgumentException(Environment.GetResourceString("Argument_ImplementIComparable")); } [System.Security.SecurityCritical] // auto-generated_required public void GetObjectData(SerializationInfo info, StreamingContext context) { if (info==null) { throw new ArgumentNullException("info"); } Contract.EndContractBlock(); if( m_compareInfo != null) { info.AddValue(CompareInfoName, m_compareInfo); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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