CaseInsensitiveComparer CaseInsensitiveComparer CaseInsensitiveComparer CaseInsensitiveComparer Class

Definicja

Porównuje dwa obiekty w celu zapewnienia równoważności, ignorując wielkość liter w ciągach.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
Dziedziczenie
CaseInsensitiveComparerCaseInsensitiveComparerCaseInsensitiveComparerCaseInsensitiveComparer
Atrybuty
Implementuje

Przykłady

Poniższy przykład kodu tworzy tabelę skrótów z rozróżnianiem wielkości liter i tabelę skrótów bez uwzględniania wielkości liter i pokazuje różnicę w ich zachowaniu, nawet jeśli oba zawierają te same elementy.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

Uwagi

CaseInsensitiveComparerimplementuje interfejs obsługujący porównywanie bez uwzględniania wielkości liter w ciągach CaseInsensitiveHashCodeProvider , tak IHashCodeProvider jak implementuje interfejs obsługujący porównywanie bez uwzględniania wielkości liter w ciągach. IComparerCaseInsensitiveComparer implements the IComparer interface supporting case-insensitive comparisons on strings, just as CaseInsensitiveHashCodeProvider implements the IHashCodeProvider interface supporting case-insensitive comparisons on strings.

Ważne

Nie zalecamy używania CaseInsensitiveComparer klasy do nowych celów programistycznych.We don't recommend that you use the CaseInsensitiveComparer class for new development. Zamiast tego System.StringComparer zaleca się użycie obiektu zwróconego StringComparer.CurrentCultureIgnoreCaseprzez właściwość, StringComparer.InvariantCultureIgnoreCase, lub StringComparer.OrdinalIgnoreCase .Instead, we recommend that you use the System.StringComparer object returned by the StringComparer.CurrentCultureIgnoreCase, StringComparer.InvariantCultureIgnoreCase, or StringComparer.OrdinalIgnoreCase property.

Klasa jest domyślną implementacją IComparer interfejsu i wykonuje porównania ciągów z uwzględnieniem wielkości liter. ComparerThe Comparer class is the default implementation of the IComparer interface and performs case-sensitive string comparisons.

Obiekty używane jako Hashtable klucze przez są wymagane do Object.GetHashCode przesłania metody (lub IHashCodeProvider IComparer interfejsu) i Object.Equals metody (lub interfejsu).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). Implementacja obu metod lub interfejsów musi obsługiwać rozróżnianie wielkości liter w ten sam sposób; w przeciwnym razie Hashtable może zachowywać się nieprawidłowo.The implementation of both methods or interfaces must handle case sensitivity the same way; otherwise, the Hashtable might behave incorrectly. Na przykład podczas tworzenia elementu Hashtablenależy użyć tej klasy CaseInsensitiveHashCodeProvider z klasą lub dowolną implementacją bez uwzględniania IHashCodeProvider wielkości liter.For example, when creating a Hashtable, you must use this class with the CaseInsensitiveHashCodeProvider class or any case-insensitive IHashCodeProvider implementation.

Porównania ciągów mogą mieć różne wyniki, w zależności od kultury.String comparisons might have different results depending on the culture. Aby uzyskać więcej informacji na temat porównań specyficznych dla System.Globalization kultury, zobacz Przestrzeń nazw oraz globalizacja i lokalizacja.For more information on culture-specific comparisons, see the System.Globalization namespace and Globalization and Localization.

Konstruktory

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

Inicjuje nowe wystąpienie CaseInsensitiveComparer klasy CurrentCulture przy użyciu bieżącego wątku.Initializes a new instance of the CaseInsensitiveComparer class using the CurrentCulture of the current thread.

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

Inicjuje nowe wystąpienie CaseInsensitiveComparer klasy przy użyciu określonego CultureInfoelementu.Initializes a new instance of the CaseInsensitiveComparer class using the specified CultureInfo.

Właściwości

Default Default Default Default

Pobiera wystąpienie CaseInsensitiveComparer , które jest skojarzone CurrentCulture z bieżącym wątkiem, które jest zawsze dostępne.Gets an instance of CaseInsensitiveComparer that is associated with the CurrentCulture of the current thread and that is always available.

DefaultInvariant DefaultInvariant DefaultInvariant DefaultInvariant

Pobiera wystąpienie CaseInsensitiveComparer , które jest skojarzone z InvariantCulture i, które jest zawsze dostępne.Gets an instance of CaseInsensitiveComparer that is associated with InvariantCulture and that is always available.

Metody

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

Wykonuje porównanie wielkości liter w dwóch obiektach tego samego typu i zwraca wartość wskazującą, czy jedna z nich jest mniejsza niż, równa lub większa od drugiej.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)

Określa, czy określony obiekt jest równy bieżącemu obiektowi.Determines whether the specified object is equal to the current object.

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

Służy jako domyślna funkcja skrótu.Serves as the default hash function.

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

Type Pobiera bieżące wystąpienie.Gets the Type of the current instance.

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

Tworzy skróconą kopię bieżącego Objectelementu.Creates a shallow copy of the current Object.

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

Zwraca ciąg, który reprezentuje bieżący obiekt.Returns a string that represents the current object.

(Inherited from Object)

Dotyczy

Zobacz też