CaseInsensitiveComparer.DefaultInvariant-Eigenschaft

Ruft eine Instanz von CaseInsensitiveComparer ab, die CultureInfo.InvariantCulture zugeordnet und jederzeit verfügbar ist.

Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Shared ReadOnly Property DefaultInvariant As CaseInsensitiveComparer
'Usage
Dim value As CaseInsensitiveComparer

value = CaseInsensitiveComparer.DefaultInvariant

public static CaseInsensitiveComparer DefaultInvariant { get; }

public:
static property CaseInsensitiveComparer^ DefaultInvariant {
    CaseInsensitiveComparer^ get ();
}

/** @property */
public static CaseInsensitiveComparer get_DefaultInvariant ()

public static function get DefaultInvariant () : CaseInsensitiveComparer

Eigenschaftenwert

Eine Instanz von CaseInsensitiveComparer, die CultureInfo.InvariantCulture zugeordnet ist.

Hinweise

Vergleichsprozeduren verwenden die CultureInfo.InvariantCulture, um die Sortierreihenfolge und die Regeln für die Groß- und Kleinschreibung zu bestimmen. Vergleiche von Zeichenfolgen können je nach Kultur zu verschiedenen Ergebnissen führen. Weitere Informationen über kulturabhängige Vergleiche finden Sie unter dem System.Globalization-Namespace und unter Codierung und Lokalisierung.

Beispiel

Im folgenden Codebeispiel wird eine Hashtabelle mit Berücksichtigung der Groß-/Kleinschreibung und eine Hashtabelle ohne Berücksichtigung der Groß-/Kleinschreibung erstellt und der Unterschied zwischen deren Verhalten veranschaulicht, selbst wenn beide Hashtabellen dieselben Elemente enthalten.

Imports System
Imports System.Collections
Imports System.Globalization

Public Class SamplesHashtable

   Public Shared Sub Main()

      ' Create a Hashtable using the default hash code provider and the default comparer.
      Dim myHT1 As New Hashtable()
      myHT1.Add("FIRST", "Hello")
      myHT1.Add("SECOND", "World")
      myHT1.Add("THIRD", "!")

      ' Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      ' based on the culture of the current thread.
      Dim myHT2 As New Hashtable(New CaseInsensitiveHashCodeProvider(), New CaseInsensitiveComparer())
      myHT2.Add("FIRST", "Hello")
      myHT2.Add("SECOND", "World")
      myHT2.Add("THIRD", "!")

      ' Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      ' based on the InvariantCulture.
      Dim myHT3 As New Hashtable(CaseInsensitiveHashCodeProvider.DefaultInvariant, CaseInsensitiveComparer.DefaultInvariant)
      myHT3.Add("FIRST", "Hello")
      myHT3.Add("SECOND", "World")
      myHT3.Add("THIRD", "!")

      ' Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      ' based on the Turkish culture (tr-TR), where "I" is not the uppercase version of "i".
      Dim myCul As New CultureInfo("tr-TR")
      Dim myHT4 As New Hashtable(New CaseInsensitiveHashCodeProvider(myCul), New CaseInsensitiveComparer(myCul))
      myHT4.Add("FIRST", "Hello")
      myHT4.Add("SECOND", "World")
      myHT4.Add("THIRD", "!")

      ' Search for a key in each hashtable.
      Console.WriteLine("first is in myHT1: {0}", myHT1.ContainsKey("first"))
      Console.WriteLine("first is in myHT2: {0}", myHT2.ContainsKey("first"))
      Console.WriteLine("first is in myHT3: {0}", myHT3.ContainsKey("first"))
      Console.WriteLine("first is in myHT4: {0}", myHT4.ContainsKey("first"))

   End Sub 'Main 

End Class 'SamplesHashtable


'This code produces the following output.  Results vary depending on the system's culture settings.
'
'first is in myHT1: False
'first is in myHT2: True
'first is in myHT3: True
'first is in myHT4: False

using System;
using System.Collections;
using System.Globalization;

public class SamplesHashtable  {

   public static void Main()  {

      // Create a Hashtable using the default hash code provider and the default comparer.
      Hashtable myHT1 = new Hashtable();
      myHT1.Add("FIRST", "Hello");
      myHT1.Add("SECOND", "World");
      myHT1.Add("THIRD", "!");

      // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      // based on the culture of the current thread.
      Hashtable myHT2 = new Hashtable( new CaseInsensitiveHashCodeProvider(), new CaseInsensitiveComparer() );
      myHT2.Add("FIRST", "Hello");
      myHT2.Add("SECOND", "World");
      myHT2.Add("THIRD", "!");

      // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      // based on the InvariantCulture.
      Hashtable myHT3 = new Hashtable( CaseInsensitiveHashCodeProvider.DefaultInvariant, CaseInsensitiveComparer.DefaultInvariant );
      myHT3.Add("FIRST", "Hello");
      myHT3.Add("SECOND", "World");
      myHT3.Add("THIRD", "!");

      // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
      // based on the Turkish culture (tr-TR), where "I" is not the uppercase version of "i".
      CultureInfo myCul = new CultureInfo( "tr-TR" );
      Hashtable myHT4 = new Hashtable( new CaseInsensitiveHashCodeProvider( myCul ), new CaseInsensitiveComparer( myCul ) );
      myHT4.Add("FIRST", "Hello");
      myHT4.Add("SECOND", "World");
      myHT4.Add("THIRD", "!");

      // Search for a key in each hashtable.
      Console.WriteLine( "first is in myHT1: {0}", myHT1.ContainsKey( "first" ) );
      Console.WriteLine( "first is in myHT2: {0}", myHT2.ContainsKey( "first" ) );
      Console.WriteLine( "first is in myHT3: {0}", myHT3.ContainsKey( "first" ) );
      Console.WriteLine( "first is in myHT4: {0}", myHT4.ContainsKey( "first" ) );

   }

}


/* 
This code produces the following output.  Results vary depending on the system's culture settings.

first is in myHT1: False
first is in myHT2: True
first is in myHT3: True
first is in myHT4: False

*/

using namespace System;
using namespace System::Collections;
using namespace System::Globalization;
int main()
{
   
   // Create a Hashtable using the default hash code provider and the default comparer.
   Hashtable^ myHT1 = gcnew Hashtable;
   myHT1->Add( "FIRST", "Hello" );
   myHT1->Add( "SECOND", "World" );
   myHT1->Add( "THIRD", "!" );
   
   // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
   // based on the culture of the current thread.
   Hashtable^ myHT2 = gcnew Hashtable( gcnew CaseInsensitiveHashCodeProvider,gcnew CaseInsensitiveComparer );
   myHT2->Add( "FIRST", "Hello" );
   myHT2->Add( "SECOND", "World" );
   myHT2->Add( "THIRD", "!" );
   
   // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
   // based on the InvariantCulture.
   Hashtable^ myHT3 = gcnew Hashtable( CaseInsensitiveHashCodeProvider::DefaultInvariant,CaseInsensitiveComparer::DefaultInvariant );
   myHT3->Add( "FIRST", "Hello" );
   myHT3->Add( "SECOND", "World" );
   myHT3->Add( "THIRD", "!" );
   
   // Create a Hashtable using a case-insensitive code provider and a case-insensitive comparer,
   // based on the Turkish culture (tr-TR), where "I" is not the uppercase version of "i".
   CultureInfo^ myCul = gcnew CultureInfo( "tr-TR" );
   Hashtable^ myHT4 = gcnew Hashtable( gcnew CaseInsensitiveHashCodeProvider( myCul ),gcnew CaseInsensitiveComparer( myCul ) );
   myHT4->Add( "FIRST", "Hello" );
   myHT4->Add( "SECOND", "World" );
   myHT4->Add( "THIRD", "!" );
   
   // Search for a key in each hashtable.
   Console::WriteLine( "first is in myHT1: {0}", myHT1->ContainsKey( "first" ) );
   Console::WriteLine( "first is in myHT2: {0}", myHT2->ContainsKey( "first" ) );
   Console::WriteLine( "first is in myHT3: {0}", myHT3->ContainsKey( "first" ) );
   Console::WriteLine( "first is in myHT4: {0}", myHT4->ContainsKey( "first" ) );
}

/* 
This code produces the following output.  Results vary depending on the system's culture settings.

first is in myHT1: False
first is in myHT2: True
first is in myHT3: True
first is in myHT4: False

*/

import System.*;
import System.Collections.*;
import System.Globalization.*;

public class SamplesHashtable
{
    public static void main(String[] args)
    {
        // Create a Hashtable using the default hash code provider and the
        // default comparer.
        Hashtable myHT1 = new Hashtable();
        myHT1.Add("FIRST", "Hello");
        myHT1.Add("SECOND", "World");
        myHT1.Add("THIRD", "!");
          
        // Create a Hashtable using a case-insensitive code provider and a 
        // case-insensitive comparer, based on the culture of the 
        // current thread.
        Hashtable myHT2 = new Hashtable(new CaseInsensitiveHashCodeProvider(),
            new CaseInsensitiveComparer());
        myHT2.Add("FIRST", "Hello");
        myHT2.Add("SECOND", "World");
        myHT2.Add("THIRD", "!");
          
        // Create a Hashtable using a case-insensitive code provider and 
        // a case-insensitive comparer, based on the InvariantCulture.
        Hashtable myHT3 =  
            new Hashtable(CaseInsensitiveHashCodeProvider.get_DefaultInvariant(),
            CaseInsensitiveComparer.get_DefaultInvariant());
        myHT3.Add("FIRST", "Hello");
        myHT3.Add("SECOND", "World");
        myHT3.Add("THIRD", "!");
          
        // Create a Hashtable using a case-insensitive code provider and a 
        // case-insensitive comparer, based on the Turkish culture (tr-TR), 
        // where "I" is not the uppercase version of "i".
        CultureInfo myCul =  new CultureInfo("tr-TR");
        Hashtable myHT4 =  
            new Hashtable(new CaseInsensitiveHashCodeProvider(myCul), 
            new CaseInsensitiveComparer(myCul));
        myHT4.Add("FIRST", "Hello");
        myHT4.Add("SECOND", "World");
        myHT4.Add("THIRD", "!");
          
        // Search for a key in each hashtable.
        Console.WriteLine("first is in myHT1: {0}", 
            (System.Boolean)myHT1.ContainsKey("first"));
        Console.WriteLine("first is in myHT2: {0}", 
            (System.Boolean)myHT2.ContainsKey("first"));
        Console.WriteLine("first is in myHT3: {0}", 
            (System.Boolean)myHT3.ContainsKey("first"));
        Console.WriteLine("first is in myHT4: {0}", 
            (System.Boolean)myHT4.ContainsKey("first"));
    } //main
} //SamplesHashtable

/* 
This code produces the following output.  Results vary depending on the system's 
culture settings.

first is in myHT1: False
first is in myHT2: True
first is in myHT3: True
first is in myHT4: False

*/

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1

.NET Compact Framework

Unterstützt in: 2.0, 1.0

Siehe auch

Referenz

CaseInsensitiveComparer-Klasse
CaseInsensitiveComparer-Member
System.Collections-Namespace
CultureInfo.InvariantCulture
System.Globalization.CompareInfo

Weitere Ressourcen

Durchführen kulturunabhängiger Zeichenfolgenoperationen in Auflistungen