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
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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
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33 using System.Globalization;
34 using System.Runtime.InteropServices;
36 namespace System.Collections
45 class CaseInsensitiveComparer : IComparer
47 readonly static CaseInsensitiveComparer defaultComparer = new CaseInsensitiveComparer ();
48 readonly static CaseInsensitiveComparer defaultInvariantComparer = new CaseInsensitiveComparer (true);
50 private CultureInfo culture;
52 // Public instance constructor
53 public CaseInsensitiveComparer ()
55 //LAMESPEC: This seems to be encoded while the object is created while Comparer does this at runtime.
56 culture = CultureInfo.CurrentCulture;
59 private CaseInsensitiveComparer (bool invariant)
61 // leave culture == null
64 public CaseInsensitiveComparer (CultureInfo culture)
67 throw new ArgumentNullException ("culture");
69 if (culture.LCID != CultureInfo.InvariantCulture.LCID)
70 this.culture = culture;
71 // else leave culture == null
75 // Public static properties
77 public static CaseInsensitiveComparer Default {
79 return defaultComparer;
83 public static CaseInsensitiveComparer DefaultInvariant {
85 return defaultInvariantComparer;
92 public int Compare (object a, object b)
94 string sa = a as string;
95 string sb = b as string;
97 if ((sa != null) && (sb != null)) {
99 return culture.CompareInfo.Compare (sa, sb, CompareOptions.IgnoreCase);
101 // FIXME: We should call directly into an invariant compare once available in string
102 return CultureInfo.InvariantCulture.CompareInfo.Compare (sa, sb, CompareOptions.IgnoreCase);
105 return Comparer.Default.Compare (a, b);