CaseInsensitiveComparer CaseInsensitiveComparer CaseInsensitiveComparer CaseInsensitiveComparer Class

Definición

Compara dos objetos para ver la equivalencia omitiendo la distinción entre mayúsculas y minúsculas de las cadenas.Compares two objects for equivalence, ignoring the case of strings.

public ref class CaseInsensitiveComparer : System::Collections::IComparer
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class CaseInsensitiveComparer : System.Collections.IComparer
type CaseInsensitiveComparer = class
    interface IComparer
Public Class CaseInsensitiveComparer
Implements IComparer
Herencia
CaseInsensitiveComparerCaseInsensitiveComparerCaseInsensitiveComparerCaseInsensitiveComparer
Atributos
Implementaciones

Ejemplos

En el ejemplo de código siguiente se crea una tabla hash distingue mayúsculas de minúsculas y una tabla hash de mayúsculas y minúsculas y se muestra la diferencia en su comportamiento, incluso si ambos contienen los mismos elementos.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
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

Comentarios

CaseInsensitiveComparer implementa el IComparer interfaz admite comparaciones entre mayúsculas y minúsculas en las cadenas, al igual que CaseInsensitiveHashCodeProvider implementa el IHashCodeProvider interfaz admite comparaciones entre mayúsculas y minúsculas en las cadenas.CaseInsensitiveComparer implements the IComparer interface supporting case-insensitive comparisons on strings, just as CaseInsensitiveHashCodeProvider implements the IHashCodeProvider interface supporting case-insensitive comparisons on strings.

Importante

No se recomienda que utilice el CaseInsensitiveComparer clase para el nuevo desarrollo.We don't recommend that you use the CaseInsensitiveComparer class for new development. En su lugar, se recomienda que use el System.StringComparer objeto devuelto por la StringComparer.CurrentCultureIgnoreCase, StringComparer.InvariantCultureIgnoreCase, o StringComparer.OrdinalIgnoreCase propiedad.Instead, we recommend that you use the System.StringComparer object returned by the StringComparer.CurrentCultureIgnoreCase, StringComparer.InvariantCultureIgnoreCase, or StringComparer.OrdinalIgnoreCase property.

El Comparer clase es la implementación predeterminada de la IComparer interfaz y realiza las comparaciones de cadenas distingue mayúsculas de minúsculas.The Comparer class is the default implementation of the IComparer interface and performs case-sensitive string comparisons.

Los objetos utilizados como claves por un Hashtable es necesario reemplazar el Object.GetHashCode método (o el IHashCodeProvider interfaz) y el Object.Equals método (o el IComparer interfaz).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). La implementación de métodos o interfaces debe tratar mayúsculas y minúsculas del mismo modo; en caso contrario, el Hashtable pueden comportarse de forma incorrecta.The implementation of both methods or interfaces must handle case sensitivity the same way; otherwise, the Hashtable might behave incorrectly. Por ejemplo, al crear un Hashtable, debe usar esta clase con el CaseInsensitiveHashCodeProvider clase o cualquiera entre mayúsculas y minúsculas IHashCodeProvider implementación.For example, when creating a Hashtable, you must use this class with the CaseInsensitiveHashCodeProvider class or any case-insensitive IHashCodeProvider implementation.

Las comparaciones de cadenas podrían tener resultados diferentes en función de la referencia cultural.String comparisons might have different results depending on the culture. Para obtener más información sobre las comparaciones específicas de la referencia cultural, consulte el System.Globalization espacio de nombres y globalización y localización.For more information on culture-specific comparisons, see the System.Globalization namespace and Globalization and Localization.

Constructores

CaseInsensitiveComparer() CaseInsensitiveComparer() CaseInsensitiveComparer() CaseInsensitiveComparer()

Inicializa una nueva instancia de la clase CaseInsensitiveComparer mediante la propiedad CurrentCulture del subproceso actual.Initializes a new instance of the CaseInsensitiveComparer class using the CurrentCulture of the current thread.

CaseInsensitiveComparer(CultureInfo) CaseInsensitiveComparer(CultureInfo) CaseInsensitiveComparer(CultureInfo) CaseInsensitiveComparer(CultureInfo)

Inicializa una nueva instancia de la clase CaseInsensitiveComparer utilizando la clase CultureInfo especificada.Initializes a new instance of the CaseInsensitiveComparer class using the specified CultureInfo.

Propiedades

Default Default Default Default

Obtiene una instancia de CaseInsensitiveComparer que está asociada a la propiedad CurrentCulture del subproceso actual y que siempre está disponible.Gets an instance of CaseInsensitiveComparer that is associated with the CurrentCulture of the current thread and that is always available.

DefaultInvariant DefaultInvariant DefaultInvariant DefaultInvariant

Obtiene una instancia de CaseInsensitiveComparer que está asociada a la propiedad InvariantCulture y que siempre está disponible.Gets an instance of CaseInsensitiveComparer that is associated with InvariantCulture and that is always available.

Métodos

Compare(Object, Object) Compare(Object, Object) Compare(Object, Object) Compare(Object, Object)

Realiza una comparación sin distinguir mayúsculas y minúsculas de dos objetos del mismo tipo y devuelve un valor que indica si uno es menor, igual o mayor que el otro.Performs a case-insensitive comparison of two objects of the same type and returns a value indicating whether one is less than, equal to, or greater than the other.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina si el objeto especificado es igual al objeto actual.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Sirve como la función hash predeterminada.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Obtiene el Type de la instancia actual.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Crea una copia superficial del Object actual.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Devuelve una cadena que representa el objeto actual.Returns a string that represents the current object.

(Inherited from Object)

Se aplica a

Consulte también: