CaseInsensitiveComparer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / 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);
      } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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