Comparer Class
Compares two objects for equivalence, where string comparisons are case-sensitive.
Assembly: mscorlib (in mscorlib.dll)
This class is the default implementation of the IComparer interface. The CaseInsensitiveComparer class is the implementation of the IComparer interface that performs case-insensitive string comparisons.
Comparison procedures use the Thread.CurrentCulture of the current thread unless otherwise specified. String comparisons might have different results depending on the culture. For more information on culture-specific comparisons, see the System.Globalization namespace and Encoding and Localization.
The following code example shows how Compare returns different values depending on the culture associated with the Comparer.
Imports System Imports System.Collections Imports System.Globalization Public Class SamplesComparer Public Shared Sub Main() ' Creates the strings to compare. Dim str1 As [String] = "llegar" Dim str2 As [String] = "lugar" Console.WriteLine("Comparing ""{0}"" and ""{1}"" ...", str1, str2) ' Uses the DefaultInvariant Comparer. Console.WriteLine(" Invariant Comparer: {0}", Comparer.DefaultInvariant.Compare(str1, str2)) ' Uses the Comparer based on the culture "es-ES" (Spanish - Spain, international sort). Dim myCompIntl As New Comparer(New CultureInfo("es-ES", False)) Console.WriteLine(" International Sort: {0}", myCompIntl.Compare(str1, str2)) ' Uses the Comparer based on the culture identifier 0x040A (Spanish - Spain, traditional sort). Dim myCompTrad As New Comparer(New CultureInfo(&H40A, False)) Console.WriteLine(" Traditional Sort : {0}", myCompTrad.Compare(str1, str2)) End Sub 'Main End Class 'SamplesComparer 'This code produces the following output. ' 'Comparing "llegar" and "lugar" ... ' Invariant Comparer: -1 ' International Sort: -1 ' Traditional Sort : 1
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.