CaseInsensitiveComparer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / CaseInsensitiveComparer.cs / 1 / CaseInsensitiveComparer.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class: CaseInsensitiveComparer 
**
** 
**
============================================================*/
namespace System.Collections {
//This class does not contain members and does not need to be serializable 
    using System;
    using System.Collections; 
    using System.Globalization; 

    [Serializable] 
[System.Runtime.InteropServices.ComVisible(true)]
    public class CaseInsensitiveComparer : IComparer {
        private CompareInfo m_compareInfo;
        private static CaseInsensitiveComparer m_InvariantCaseInsensitiveComparer; 

        public CaseInsensitiveComparer() { 
            m_compareInfo = CultureInfo.CurrentCulture.CompareInfo; 
        }
 
        public CaseInsensitiveComparer(CultureInfo culture) {
            if (culture==null) {
                throw new ArgumentNullException("culture");
            } 
            m_compareInfo = culture.CompareInfo;
        } 
 
 		public static CaseInsensitiveComparer Default
		{ 
			get
			{
 				return new CaseInsensitiveComparer(CultureInfo.CurrentCulture);
			} 
 		}
 		 
      	public static CaseInsensitiveComparer DefaultInvariant 
		{
 			get 
			{
                if (m_InvariantCaseInsensitiveComparer == null) {
				    m_InvariantCaseInsensitiveComparer = new CaseInsensitiveComparer(CultureInfo.InvariantCulture);
                } 
                return m_InvariantCaseInsensitiveComparer;
			} 
 		} 
	
 		// Behaves exactly like Comparer.Default.Compare except that the comparison is case insensitive 
    	// 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) {
            String sa = a as String; 
            String sb = b as String;
			if (sa != null && sb != null)
 				return m_compareInfo.Compare(sa, sb, CompareOptions.IgnoreCase);
			else 
				return Comparer.Default.Compare(a,b);
    	} 
    } 
}

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