StringComparer.CurrentCulture StringComparer.CurrentCulture StringComparer.CurrentCulture StringComparer.CurrentCulture Property

Definição

Obtém um objeto StringComparer que executa uma comparação de cadeia de caracteres que diferencia maiúsculas de minúsculas usando as regras de comparação de palavras da cultura atual.Gets a StringComparer object that performs a case-sensitive string comparison using the word comparison rules of the current culture.

public:
 static property StringComparer ^ CurrentCulture { StringComparer ^ get(); };
public static StringComparer CurrentCulture { get; }
member this.CurrentCulture : StringComparer
Public Shared ReadOnly Property CurrentCulture As StringComparer

Valor da propriedade

Exemplos

O exemplo de código a seguir demonstra as propriedades e o método Create da classe StringComparer.The following code example demonstrates the properties and the Create method of the StringComparer class. O exemplo ilustra como objetos StringComparer diferentes classificam três versões da letra I em Latin.The example illustrates how different StringComparer objects sort three versions of the Latin letter I.

// This example demonstrates members of the
// System::StringComparer class.

using namespace System;
using namespace System::Collections;
using namespace System::Collections::Generic;
using namespace System::Globalization;
using namespace System::Threading;

void Display(List<String^>^ stringList, String^ title)
{
    Char firstChar;
    int codePoint;
    Console::WriteLine(title);
    for each (String^ s in stringList)
    {
        firstChar = s[0];
        codePoint = Convert::ToInt32(firstChar);
        Console::WriteLine("0x{0:x}", codePoint);
    }
    Console::WriteLine();
}

int main()
{
    // Create a list of string.
    List<String^>^ stringList = gcnew List<String^>();

    // Get the tr-TR (Turkish-Turkey) culture.
    CultureInfo^ turkishCulture = gcnew CultureInfo("tr-TR");

    // Get the culture that is associated with the current thread.
    CultureInfo^ currentCulture = Thread::CurrentThread->CurrentCulture;

    // Get the standard StringComparers.
    StringComparer^ invariant = StringComparer::InvariantCulture;
    StringComparer^ invariantIgnoreCase =
        StringComparer::InvariantCultureIgnoreCase;
    StringComparer^ current = StringComparer::CurrentCulture;
    StringComparer^ currentIgnoreCase =
        StringComparer::CurrentCultureIgnoreCase;
    StringComparer^ ordinal = StringComparer::Ordinal;
    StringComparer^ ordinalIgnoreCase = StringComparer::OrdinalIgnoreCase;

    // Create a StringComparer that uses the Turkish culture and ignores
    // case.
    StringComparer^ turkishIgnoreCase =
        StringComparer::Create(turkishCulture, true);

    // Define three strings consisting of different versions of the
    // letter I. LATIN CAPITAL LETTER I (U+0049)
    String^ capitalLetterI = "I";

    // LATIN SMALL LETTER I (U+0069)
    String^ smallLetterI = "i";

    // LATIN SMALL LETTER DOTLESS I (U+0131)
    String^ smallLetterDotlessI = L"\u0131";

    // Add the three strings to the list.
    stringList->Add(capitalLetterI);
    stringList->Add(smallLetterI);
    stringList->Add(smallLetterDotlessI);

    // Display the original list order.
    Display(stringList, "The original order of the list entries...");

    // Sort the list using the invariant culture.
    stringList->Sort(invariant);
    Display(stringList, "Invariant culture...");
    stringList->Sort(invariantIgnoreCase);
    Display(stringList, "Invariant culture, ignore case...");

    // Sort the list using the current culture.
    Console::WriteLine("The current culture is \"{0}\".",
        currentCulture->Name);
    stringList->Sort(current);
    Display(stringList, "Current culture...");
    stringList->Sort(currentIgnoreCase);
    Display(stringList, "Current culture, ignore case...");

    // Sort the list using the ordinal value of the character code points.
    stringList->Sort(ordinal);
    Display(stringList, "Ordinal...");
    stringList->Sort(ordinalIgnoreCase);
    Display(stringList, "Ordinal, ignore case...");

    // Sort the list using the Turkish culture, which treats LATIN SMALL
    // LETTER DOTLESS I differently than LATIN SMALL LETTER I.
    stringList->Sort(turkishIgnoreCase);
    Display(stringList, "Turkish culture, ignore case...");
}
/*
This code example produces the following results:

The original order of the list entries...
0x49
0x69
0x131

Invariant culture...
0x69
0x49
0x131

Invariant culture, ignore case...
0x49
0x69
0x131

The current culture is "en-US".
Current culture...
0x69
0x49
0x131

Current culture, ignore case...
0x49
0x69
0x131

Ordinal...
0x49
0x69
0x131

Ordinal, ignore case...
0x69
0x49
0x131

Turkish culture, ignore case...
0x131
0x49
0x69

*/
// This example demonstrates members of the 
// System.StringComparer class.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Threading;

class Sample 
{
    public static void Main() 
    {
// Create a list of string.
    List<string> list = new List<string>();

// Get the tr-TR (Turkish-Turkey) culture.
    CultureInfo turkish = new CultureInfo("tr-TR");

// Get the culture that is associated with the current thread.
    CultureInfo thisCulture = Thread.CurrentThread.CurrentCulture;

// Get the standard StringComparers.
    StringComparer invCmp =   StringComparer.InvariantCulture;
    StringComparer invICCmp = StringComparer.InvariantCultureIgnoreCase;
    StringComparer currCmp = StringComparer.CurrentCulture;
    StringComparer currICCmp = StringComparer.CurrentCultureIgnoreCase;
    StringComparer ordCmp = StringComparer.Ordinal;
    StringComparer ordICCmp = StringComparer.OrdinalIgnoreCase;

// Create a StringComparer that uses the Turkish culture and ignores case.
    StringComparer turkICComp = StringComparer.Create(turkish, true);

// Define three strings consisting of different versions of the letter I.
// LATIN CAPITAL LETTER I (U+0049)
    string capitalLetterI = "I";  

// LATIN SMALL LETTER I (U+0069)
    string smallLetterI   = "i";

// LATIN SMALL LETTER DOTLESS I (U+0131)
    string smallLetterDotlessI = "\u0131";

// Add the three strings to the list.
    list.Add(capitalLetterI);
    list.Add(smallLetterI);
    list.Add(smallLetterDotlessI);

// Display the original list order.
    Display(list, "The original order of the list entries...");

// Sort the list using the invariant culture.
    list.Sort(invCmp);
    Display(list, "Invariant culture...");
    list.Sort(invICCmp);
    Display(list, "Invariant culture, ignore case...");

// Sort the list using the current culture.
    Console.WriteLine("The current culture is \"{0}\".", thisCulture.Name);
    list.Sort(currCmp);
    Display(list, "Current culture...");
    list.Sort(currICCmp);
    Display(list, "Current culture, ignore case...");

// Sort the list using the ordinal value of the character code points.
    list.Sort(ordCmp);
    Display(list, "Ordinal...");
    list.Sort(ordICCmp);
    Display(list, "Ordinal, ignore case...");

// Sort the list using the Turkish culture, which treats LATIN SMALL LETTER 
// DOTLESS I differently than LATIN SMALL LETTER I.
    list.Sort(turkICComp);
    Display(list, "Turkish culture, ignore case...");
    }

    public static void Display(List<string> lst, string title)
    {
    Char c;
    int  codePoint;
    Console.WriteLine(title);
    foreach (string s in lst)
        {
        c = s[0];
        codePoint = Convert.ToInt32(c);
        Console.WriteLine("0x{0:x}", codePoint); 
        }
    Console.WriteLine();
    }
}
/*
This code example produces the following results:

The original order of the list entries...
0x49
0x69
0x131

Invariant culture...
0x69
0x49
0x131

Invariant culture, ignore case...
0x49
0x69
0x131

The current culture is "en-US".
Current culture...
0x69
0x49
0x131

Current culture, ignore case...
0x49
0x69
0x131

Ordinal...
0x49
0x69
0x131

Ordinal, ignore case...
0x69
0x49
0x131

Turkish culture, ignore case...
0x131
0x49
0x69

*/
' This code example demonstrates members of the System.StringComparer class.

Imports System
Imports System.Collections
Imports System.Collections.Generic
Imports System.Globalization
Imports System.Threading

Class Sample
    
    Public Shared Sub Main() 
        ' Create a list of string.
        Dim list As New List(Of String) 
        
        ' Get the tr-TR (Turkish-Turkey) culture.
        Dim turkish As New CultureInfo("tr-TR")
        
        ' Get the culture that is associated with the current thread.
        Dim thisCulture As CultureInfo = Thread.CurrentThread.CurrentCulture
        
        ' Get the standard StringComparers.
        Dim invCmp As StringComparer = StringComparer.InvariantCulture
        Dim invICCmp As StringComparer = StringComparer.InvariantCultureIgnoreCase
        Dim currCmp As StringComparer = StringComparer.CurrentCulture
        Dim currICCmp As StringComparer = StringComparer.CurrentCultureIgnoreCase
        Dim ordCmp As StringComparer = StringComparer.Ordinal
        Dim ordICCmp As StringComparer = StringComparer.OrdinalIgnoreCase
        
        ' Create a StringComparer that uses the Turkish culture and ignores case.
        Dim turkICComp As StringComparer = StringComparer.Create(turkish, True)
        
        ' Define three strings consisting of different versions of the letter I.
        ' LATIN CAPITAL LETTER I (U+0049)
        Dim capitalLetterI As String = "I"
        
        ' LATIN SMALL LETTER I (U+0069)
        Dim smallLetterI As String = "i"
        
        ' LATIN SMALL LETTER DOTLESS I (U+0131)
        Dim smallLetterDotlessI As String = "ı"
        
        ' Add the three strings to the list.
        list.Add(capitalLetterI)
        list.Add(smallLetterI)
        list.Add(smallLetterDotlessI)
        
        ' Display the original list order.
        Display(list, "The original order of the list entries...")
        
        ' Sort the list using the invariant culture.
        list.Sort(invCmp)
        Display(list, "Invariant culture...")
        list.Sort(invICCmp)
        Display(list, "Invariant culture, ignore case...")
        
        ' Sort the list using the current culture.
        Console.WriteLine("The current culture is ""{0}"".", thisCulture.Name)
        list.Sort(currCmp)
        Display(list, "Current culture...")
        list.Sort(currICCmp)
        Display(list, "Current culture, ignore case...")
        
        ' Sort the list using the ordinal value of the character code points.
        list.Sort(ordCmp)
        Display(list, "Ordinal...")
        list.Sort(ordICCmp)
        Display(list, "Ordinal, ignore case...")
        
        ' Sort the list using the Turkish culture, which treats LATIN SMALL LETTER 
        ' DOTLESS I differently than LATIN SMALL LETTER I.
        list.Sort(turkICComp)
        Display(list, "Turkish culture, ignore case...")
    
    End Sub 'Main
    
    Public Shared Sub Display(ByVal lst As List(Of String), ByVal title As String)
        Dim c As Char
        Dim s As String
        Dim codePoint As Integer

        Console.WriteLine(title)
        For Each s In lst
            c = s(0)
            codePoint = Convert.ToInt32(c)
            Console.WriteLine("0x{0:x}", codePoint)
        Next s
        Console.WriteLine()
    End Sub 'Display
End Class 'Sample '

'This code example produces the following results:
'
'The original order of the list entries...
'0x49
'0x69
'0x131
'
'Invariant culture...
'0x69
'0x49
'0x131
'
'Invariant culture, ignore case...
'0x49
'0x69
'0x131
'
'The current culture is "en-US".
'Current culture...
'0x69
'0x49
'0x131
'
'Current culture, ignore case...
'0x49
'0x69
'0x131
'
'Ordinal...
'0x49
'0x69
'0x131
'
'Ordinal, ignore case...
'0x69
'0x49
'0x131
'
'Turkish culture, ignore case...
'0x131
'0x49
'0x69
'

Comentários

O StringComparer retornado pelo CurrentCulture propriedade pode ser usada quando as cadeias de caracteres são linguisticamente relevantes.The StringComparer returned by the CurrentCulture property can be used when strings are linguistically relevant. Por exemplo, se cadeias de caracteres são exibidas ao usuário, ou se cadeias de caracteres são o resultado da interação do usuário, a comparação de cadeia de caracteres sensíveis à cultura deve ser usada para ordenar os dados de cadeia de caracteres.For example, if strings are displayed to the user, or if strings are the result of user interaction, culture-sensitive string comparison should be used to order the string data.

A cultura atual é o CultureInfo objeto associado ao thread atual.The current culture is the CultureInfo object associated with the current thread.

O CurrentCulture propriedade realmente retorna uma instância de uma classe anônima derivada o StringComparer classe.The CurrentCulture property actually returns an instance of an anonymous class derived from the StringComparer class.

Cada chamada para o CurrentCulture propriedade get acessador retorna um novo StringComparer objeto, como mostra o código a seguir.Each call to the CurrentCulture property get accessor returns a new StringComparer object, as the following code shows.

private void CompareCurrentCultureStringComparer()
{
   StringComparer stringComparer1 = StringComparer.CurrentCulture;
   StringComparer stringComparer2 = StringComparer.CurrentCulture;
   // Displays false
   Console.WriteLine(StringComparer.ReferenceEquals(stringComparer1, 
                                                    stringComparer2));
}
Private Sub CompareCurrentCultureStringComparers()
   Dim stringComparer1 As StringComparer = StringComparer.CurrentCulture
   Dim stringComparer2 As StringComparer = StringComparer.CurrentCulture
   ' Displays False
   Console.WriteLine(StringComparer.ReferenceEquals(stringComparer1, _
                                                    stringComparer2))
End Sub

Para melhorar o desempenho, você pode armazenar o StringComparer do objeto em uma variável local em vez de recuperar o valor da CurrentCulture propriedade várias vezes.To improve performance, you can store the StringComparer object in a local variable rather than retrieve the value of the CurrentCulture property multiple times.

Aplica-se a

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