CaseInsensitiveHashCodeProvider Classe

Définition

Attention

Please use StringComparer instead.

Fournit un code de hachage pour un objet en utilisant un algorithme de hachage qui ignore la casse des chaînes.Supplies a hash code for an object, using a hashing algorithm that ignores the case of strings.

public ref class CaseInsensitiveHashCodeProvider : System::Collections::IHashCodeProvider
[System.Obsolete("Please use StringComparer instead.")]
public class CaseInsensitiveHashCodeProvider : System.Collections.IHashCodeProvider
public class CaseInsensitiveHashCodeProvider : System.Collections.IHashCodeProvider
[System.Serializable]
public class CaseInsensitiveHashCodeProvider : System.Collections.IHashCodeProvider
[System.Obsolete("Please use StringComparer instead.")]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class CaseInsensitiveHashCodeProvider : System.Collections.IHashCodeProvider
[<System.Obsolete("Please use StringComparer instead.")>]
type CaseInsensitiveHashCodeProvider = class
    interface IHashCodeProvider
type CaseInsensitiveHashCodeProvider = class
    interface IHashCodeProvider
[<System.Serializable>]
type CaseInsensitiveHashCodeProvider = class
    interface IHashCodeProvider
[<System.Obsolete("Please use StringComparer instead.")>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type CaseInsensitiveHashCodeProvider = class
    interface IHashCodeProvider
Public Class CaseInsensitiveHashCodeProvider
Implements IHashCodeProvider
Héritage
CaseInsensitiveHashCodeProvider
Attributs
Implémente

Exemples

L’exemple de code suivant crée une table de hachage respectant la casse et une table de hachage ne respectant pas la casse et montre la différence de comportement, même si les deux contiennent les mêmes éléments.The following code example creates a case-sensitive hash table and a case-insensitive hash table and demonstrates the difference in their behavior, even if both contain the same elements.

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

*/
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

*/

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

End Class


'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

Remarques

CaseInsensitiveHashCodeProvider implémente l' IHashCodeProvider interface qui prend en charge les comparaisons ne respectant pas la casse sur les chaînes, tout comme CaseInsensitiveComparer implémente l’interface qui prend en charge les comparaisons ne respectant pas la IComparer casse sur les chaînes.CaseInsensitiveHashCodeProvider implements the IHashCodeProvider interface supporting case-insensitive comparisons on strings, just as CaseInsensitiveComparer implements the IComparer interface supporting case-insensitive comparisons on strings.

Important

Nous vous déconseillons d’utiliser la CaseInsensitiveHashCodeProvider classe pour un nouveau développement.We don't recommend that you use the CaseInsensitiveHashCodeProvider class for new development. Au lieu de cela, nous vous recommandons System.StringComparer d’utiliser l’objet retourné par la StringComparer.CurrentCultureIgnoreCase StringComparer.InvariantCultureIgnoreCase propriété, ou StringComparer.OrdinalIgnoreCase .Instead, we recommend that you use the System.StringComparer object returned by the StringComparer.CurrentCultureIgnoreCase, StringComparer.InvariantCultureIgnoreCase, or StringComparer.OrdinalIgnoreCase property.

Les objets utilisés comme clés par un Hashtable sont requis pour substituer la Object.GetHashCode méthode (ou l' IHashCodeProvider interface) et la Object.Equals méthode (ou l' IComparer interface).The objects used as keys by a Hashtable are required to override the Object.GetHashCode method (or the IHashCodeProvider interface) and the Object.Equals method (or the IComparer interface). L’implémentation des méthodes ou des interfaces doit gérer le respect de la casse de la même façon ; dans le cas contraire, le Hashtable risque de se comporter de manière incorrecte.The implementation of both methods or interfaces must handle case sensitivity the same way; otherwise, the Hashtable might behave incorrectly. Par exemple, lors de la création d’un Hashtable , vous devez utiliser cette classe avec la CaseInsensitiveComparer classe ou toute implémentation ne respectant pas la casse IComparer .For example, when creating a Hashtable, you must use this class with the CaseInsensitiveComparer class or any case-insensitive IComparer implementation.

Constructeurs

CaseInsensitiveHashCodeProvider()

Initialise une nouvelle instance de la classe CaseInsensitiveHashCodeProvider à l'aide de CurrentCulture du thread en cours.Initializes a new instance of the CaseInsensitiveHashCodeProvider class using the CurrentCulture of the current thread.

CaseInsensitiveHashCodeProvider(CultureInfo)

Initialise une nouvelle instance de la classe CaseInsensitiveHashCodeProvider à l'aide du CultureInfo spécifié.Initializes a new instance of the CaseInsensitiveHashCodeProvider class using the specified CultureInfo.

Propriétés

Default

Obtient une instance de CaseInsensitiveHashCodeProvider associée au CurrentCulture du thread en cours et toujours disponible.Gets an instance of CaseInsensitiveHashCodeProvider that is associated with the CurrentCulture of the current thread and that is always available.

DefaultInvariant

Obtient une instance de CaseInsensitiveHashCodeProvider associée à InvariantCulture et toujours disponible.Gets an instance of CaseInsensitiveHashCodeProvider that is associated with InvariantCulture and that is always available.

Méthodes

Equals(Object)

Détermine si l'objet spécifié est égal à l'objet actuel.Determines whether the specified object is equal to the current object.

(Hérité de Object)
GetHashCode()

Fait office de fonction de hachage par défaut.Serves as the default hash function.

(Hérité de Object)
GetHashCode(Object)

Retourne un code de hachage pour un objet donné, en utilisant un algorithme de hachage qui ignore la casse des chaînes.Returns a hash code for the given object, using a hashing algorithm that ignores the case of strings.

GetType()

Obtient le Type de l'instance actuelle.Gets the Type of the current instance.

(Hérité de Object)
MemberwiseClone()

Crée une copie superficielle du Object actuel.Creates a shallow copy of the current Object.

(Hérité de Object)
ToString()

Retourne une chaîne qui représente l'objet actuel.Returns a string that represents the current object.

(Hérité de Object)

S’applique à

Voir aussi