2 // System.Collections.CaseInsensitiveComparer.cs
5 // Sergey Chaban (serge@wildwestsoftware.com)
6 // Eduardo Garcia Cebollero (kiwnix@yahoo.es)
7 // Andreas Nahr (ClassDevelopment@A-SoftTech.com)
11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
13 // Permission is hereby granted, free of charge, to any person obtaining
14 // a copy of this software and associated documentation files (the
15 // "Software"), to deal in the Software without restriction, including
16 // without limitation the rights to use, copy, modify, merge, publish,
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18 // permit persons to whom the Software is furnished to do so, subject to
19 // the following conditions:
21 // The above copyright notice and this permission notice shall be
22 // included in all copies or substantial portions of the Software.
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26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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33 using System.Globalization;
34 using System.Runtime.InteropServices;
36 namespace System.Collections
42 public class CaseInsensitiveComparer : IComparer
44 private static CaseInsensitiveComparer defaultComparer = new CaseInsensitiveComparer ();
45 private static CaseInsensitiveComparer defaultInvariantComparer = new CaseInsensitiveComparer (true);
47 private CultureInfo culture;
49 // Public instance constructor
50 public CaseInsensitiveComparer ()
52 //LAMESPEC: This seems to be encoded while the object is created while Comparer does this at runtime.
53 culture = CultureInfo.CurrentCulture;
56 private CaseInsensitiveComparer (bool invariant)
58 // leave culture == null
61 public CaseInsensitiveComparer (CultureInfo culture)
64 throw new ArgumentNullException ("culture");
66 if (culture.LCID != CultureInfo.InvariantCulture.LCID)
67 this.culture = culture;
68 // else leave culture == null
72 // Public static properties
74 public static CaseInsensitiveComparer Default {
76 return defaultComparer;
85 static CaseInsensitiveComparer DefaultInvariant {
87 return defaultInvariantComparer;
94 public int Compare (object a, object b)
96 string sa = a as string;
97 string sb = b as string;
99 if ((sa != null) && (sb != null)) {
101 return culture.CompareInfo.Compare (sa, sb, CompareOptions.IgnoreCase);
103 // FIXME: We should call directly into an invariant compare once available in string
104 return CultureInfo.InvariantCulture.CompareInfo.Compare (sa, sb, CompareOptions.IgnoreCase);
107 return Comparer.Default.Compare (a, b);