Comparer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / Comparer.cs / 1 / 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;

    [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");
            }
            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")); 
        }
 
        [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] 
        public void GetObjectData(SerializationInfo info, StreamingContext context) {
            if (info==null) { 
                throw new ArgumentNullException("info");
            }

            if( m_compareInfo != null) { 
                info.AddValue(CompareInfoName, m_compareInfo);
            } 
        } 
    }
}

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