String.ToLower String.ToLower String.ToLower String.ToLower Method

Definição

Retorna uma cópia dessa cadeia de caracteres convertida em minúsculas.Returns a copy of this string converted to lowercase.

Sobrecargas

ToLower(CultureInfo) ToLower(CultureInfo) ToLower(CultureInfo) ToLower(CultureInfo)

Retorna uma cópia desta cadeia de caracteres convertida em minúsculas, usando as regras de maiúsculas e minúsculas da cultura especificada.Returns a copy of this string converted to lowercase, using the casing rules of the specified culture.

ToLower() ToLower() ToLower() ToLower()

Retorna uma cópia dessa cadeia de caracteres convertida em minúsculas.Returns a copy of this string converted to lowercase.

ToLower(CultureInfo) ToLower(CultureInfo) ToLower(CultureInfo) ToLower(CultureInfo)

Retorna uma cópia desta cadeia de caracteres convertida em minúsculas, usando as regras de maiúsculas e minúsculas da cultura especificada.Returns a copy of this string converted to lowercase, using the casing rules of the specified culture.

public:
 System::String ^ ToLower(System::Globalization::CultureInfo ^ culture);
public string ToLower (System.Globalization.CultureInfo culture);
member this.ToLower : System.Globalization.CultureInfo -> string
Public Function ToLower (culture As CultureInfo) As String

Parâmetros

culture
CultureInfo CultureInfo CultureInfo CultureInfo

Um objeto que fornece regras de uso de maiúsculas específicas da cultura.An object that supplies culture-specific casing rules.

Retornos

O equivalente da cadeia de caracteres atual em minúsculas.The lowercase equivalent of the current string.

Exceções

Exemplos

O exemplo a seguir converte duas cadeias de caracteres em maiusculas para minúsculas usando as culturas Inglês-Estados Unidos e Turco-Turquia e, em seguida, compara as cadeias de caracteres em minúsculas.The following example converts two strings of uppercase characters to lowercase characters using the English-United States and Turkish-Turkey cultures, then compares the lowercase strings. As cadeias de caracteres maiusculos são idênticas, exceto para cada ocorrência do Unicode LATINO LETRA maiuscula I em uma cadeia de caracteres, a outra cadeia de caracteres contém LATINO LETRA maiuscula I com ponto acima.The uppercase strings are identical except that for each occurrence of the Unicode LATIN CAPITAL LETTER I in one string, the other string contains LATIN CAPITAL LETTER I WITH DOT ABOVE.

// Sample for String::ToLower(CultureInfo)
using namespace System;
using namespace System::Globalization;
void CodePoints( String^ title, String^ s )
{
   Console::Write( "{0}The code points in {1} are: {0}", Environment::NewLine, title );
   System::Collections::IEnumerator^ myEnum = s->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      UInt16 u =  safe_cast<Char>(myEnum->Current);
      Console::Write( "{0:x4} ", u );
   }

   Console::WriteLine();
}

int main()
{
   String^ str1 = "INDIGO";
   
   // str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE).
   array<Char>^temp = {L'\u0130',L'N',L'D',L'\u0130',L'G',L'O'};
   String^ str2 = gcnew String( temp );
   String^ str3;
   String^ str4;
   Console::WriteLine();
   Console::WriteLine( "str1 = '{0}'", str1 );
   Console::WriteLine();
   Console::WriteLine( "str1 is {0} to str2.", ((0 == String::CompareOrdinal( str1, str2 )) ? (String^)"equal" : "not equal") );
   CodePoints( "str1", str1 );
   CodePoints( "str2", str2 );
   Console::WriteLine();
   
   // str3 is a lower case copy of str2, using English-United States culture.
   Console::WriteLine( "str3 = Lower case copy of str2 using English-United States culture." );
   str3 = str2->ToLower( gcnew CultureInfo( "en-US",false ) );
   
   // str4 is a lower case copy of str2, using Turkish-Turkey culture.
   Console::WriteLine( "str4 = Lower case copy of str2 using Turkish-Turkey culture." );
   str4 = str2->ToLower( gcnew CultureInfo( "tr-TR",false ) );
   
   // Compare the code points in str3 and str4.
   Console::WriteLine();
   Console::WriteLine( "str3 is {0} to str4.", ((0 == String::CompareOrdinal( str3, str4 )) ? (String^)"equal" : "not equal") );
   CodePoints( "str3", str3 );
   CodePoints( "str4", str4 );
}

/*
This example produces the following results:

str1 = 'INDIGO'

str1 is not equal to str2.

The code points in str1 are:
0049 004e 0044 0049 0047 004f

The code points in str2 are:
0130 004e 0044 0130 0047 004f

str3 = Lower case copy of str2 using English-United States culture.
str4 = Lower case copy of str2 using Turkish-Turkey culture.

str3 is equal to str4.

The code points in str3 are:
0069 006e 0064 0069 0067 006f

The code points in str4 are:
0069 006e 0064 0069 0067 006f
*/
// Sample for String.ToLower(CultureInfo)

using System;
using System.Globalization;

class Sample 
{
    public static void Main() 
    {
    String str1 = "INDIGO";
    // str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE).
    String str2 = new String(new Char[] {'\u0130', 'N', 'D', '\u0130', 'G', 'O'});
    String str3, str4;

    Console.WriteLine();
    Console.WriteLine("str1 = '{0}'", str1);

    Console.WriteLine();
    Console.WriteLine("str1 is {0} to str2.", 
         ((0 == String.CompareOrdinal(str1, str2)) ? "equal" : "not equal"));
    CodePoints("str1", str1);
    CodePoints("str2", str2);

    Console.WriteLine();
    // str3 is a lower case copy of str2, using English-United States culture.
    Console.WriteLine("str3 = Lower case copy of str2 using English-United States culture.");
    str3 = str2.ToLower(new CultureInfo("en-US", false));

    // str4 is a lower case copy of str2, using Turkish-Turkey culture.
    Console.WriteLine("str4 = Lower case copy of str2 using Turkish-Turkey culture.");
    str4 = str2.ToLower(new CultureInfo("tr-TR", false));

    // Compare the code points in str3 and str4.
    Console.WriteLine();
    Console.WriteLine("str3 is {0} to str4.", 
         ((0 == String.CompareOrdinal(str3, str4)) ? "equal" : "not equal"));
    CodePoints("str3", str3);
    CodePoints("str4", str4);
    }

    public static void CodePoints(String title, String s)
    {
    Console.Write("{0}The code points in {1} are: {0}", Environment.NewLine, title);
    foreach (ushort u in s)
      Console.Write("{0:x4} ", u);
    Console.WriteLine();
    }
}
/*
This example produces the following results:

str1 = 'INDIGO'

str1 is not equal to str2.

The code points in str1 are:
0049 004e 0044 0049 0047 004f

The code points in str2 are:
0130 004e 0044 0130 0047 004f

str3 = Lower case copy of str2 using English-United States culture.
str4 = Lower case copy of str2 using Turkish-Turkey culture.

str3 is equal to str4.

The code points in str3 are:
0069 006e 0064 0069 0067 006f

The code points in str4 are:
0069 006e 0064 0069 0067 006f
*/
' Sample for String.ToLower(CultureInfo)
Imports System
Imports System.Globalization
Imports Microsoft.VisualBasic

Class Sample
   Public Shared Sub Main()
      Dim str1 As [String] = "INDIGO"
      ' str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE).
      Dim str2 As New [String](New [Char]() {ChrW(&H0130), "N"c, "D"c, ChrW(&H0130), "G"c, "O"c})
      Dim str3, str4 As [String]

      Console.WriteLine()
      Console.WriteLine("str1 = '{0}'", str1)

      Console.WriteLine()
      Console.WriteLine("str1 is {0} to str2.", _
                         IIf(0 = [String].CompareOrdinal(str1, str2), "equal", "not equal"))
      CodePoints("str1", str1)
      CodePoints("str2", str2)

      Console.WriteLine()
      ' str3 is a lower case copy of str2, using English-United States culture.
      Console.WriteLine("str3 = Lower case copy of str2 using English-United States culture.")
      str3 = str2.ToLower(New CultureInfo("en-US", False))

      ' str4 is a lower case copy of str2, using Turkish-Turkey culture.
      Console.WriteLine("str4 = Lower case copy of str2 using Turkish-Turkey culture.")
      str4 = str2.ToLower(New CultureInfo("tr-TR", False))

      ' Compare the code points in str3 and str4.
      Console.WriteLine()
      Console.WriteLine("str3 is {0} to str4.", _
                         IIf(0 = [String].CompareOrdinal(str3, str4), "equal", "not equal"))
      CodePoints("str3", str3)
      CodePoints("str4", str4)
   End Sub 'Main

   Public Shared Sub CodePoints(title As [String], s As [String])
      Console.Write("{0}The code points in {1} are: {0}", Environment.NewLine, title)
      Dim c As Char
      For Each c In  s
         Console.Write("{0:x4} ", AscW(c))
      Next c
      Console.WriteLine()
   End Sub 'CodePoints
End Class 'Sample
'
'str1 = 'INDIGO'
'
'str1 is not equal to str2.
'
'The code points in str1 are:
'0049 004e 0044 0049 0047 004f
'
'The code points in str2 are:
'0130 004e 0044 0130 0047 004f
'
'str3 = Lower case copy of str2 using English-United States culture.
'str4 = Lower case copy of str2 using Turkish-Turkey culture.
'
'str3 is equal to str4.
'
'The code points in str3 are:
'0069 006e 0064 0069 0067 006f
'
'The code points in str4 are:
'0069 006e 0064 0069 0067 006f

Comentários

As regras de maiusculas e minúsculas da cultura especificada pelo culture parâmetro determinar a maneira como o caso da cadeia de caracteres é alterado.The casing rules of the culture specified by the culture parameter determine the way the case of the string is changed.

Observação

Este método não altera o valor da instância atual.This method does not modify the value of the current instance. Em vez disso, ele retorna uma nova cadeia de caracteres na qual todos os caracteres na instância atual são convertidos em minúsculas.Instead, it returns a new string in which all characters in the current instance are converted to lowercase.

Considerações sobre segurançaSecurity Considerations

Se você passar o ToLower(CultureInfo) método uma CultureInfo objeto diferente de CultureInfo.InvariantCulture, a operação de maiusculas e minúsculas levará regras específicas de cultura em consideração.If you pass the ToLower(CultureInfo) method a CultureInfo object other than CultureInfo.InvariantCulture, the casing operation will take culture-specific rules into account. Se você precisa da versão em maiuscula ou minúscula de um identificador de sistema operacional, como um nome de arquivo, chamado pipe ou chave do registro, use o ToLowerInvariant ou ToUpperInvariant método.If you need the lowercase or uppercase version of an operating system identifier, such as a file name, named pipe, or registry key, use the ToLowerInvariant or ToUpperInvariant method. Isso produz o mesmo resultado em cada cultura e executa com mais eficiência.This produces the same result in every culture and performs more efficiently.

Veja também

ToLower() ToLower() ToLower() ToLower()

Retorna uma cópia dessa cadeia de caracteres convertida em minúsculas.Returns a copy of this string converted to lowercase.

public:
 System::String ^ ToLower();
public string ToLower ();
member this.ToLower : unit -> string
Public Function ToLower () As String

Retornos

Uma cadeia de caracteres em letras minúsculas.A string in lowercase.

Exemplos

O exemplo a seguir converte várias cadeias de caracteres casos mistas em minúsculas.The following example converts several mixed case strings to lowercase.

using namespace System;
using namespace System::Collections;
int main()
{
   array<String^>^info = {"Name","Title","Age","Location","Gender"};
   Console::WriteLine( "The initial values in the array are:" );
   IEnumerator^ myEnum = info->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ s = safe_cast<String^>(myEnum->Current);
      Console::WriteLine( s );
   }

   Console::WriteLine( " {0}The lowercase of these values is:", Environment::NewLine );
   IEnumerator^ myEnum1 = info->GetEnumerator();
   while ( myEnum1->MoveNext() )
   {
      String^ s = safe_cast<String^>(myEnum1->Current);
      Console::WriteLine( s->ToLower() );
   }

   Console::WriteLine( " {0}The uppercase of these values is:", Environment::NewLine );
   IEnumerator^ myEnum2 = info->GetEnumerator();
   while ( myEnum2->MoveNext() )
   {
      String^ s = safe_cast<String^>(myEnum2->Current);
      Console::WriteLine( s->ToUpper() );
   }
}
// The example displays the following output:
//       The initial values in the array are:
//       Name
//       Title
//       Age
//       Location
//       Gender
//       
//       The lowercase of these values is:
//       name
//       title
//       age
//       location
//       gender
//       
//       The uppercase of these values is:
//       NAME
//       TITLE
//       AGE
//       LOCATION
//       GENDER
using System;

public class ToLowerTest {
    public static void Main() {

        string [] info = {"Name", "Title", "Age", "Location", "Gender"};

        Console.WriteLine("The initial values in the array are:");
        foreach (string s in info)
            Console.WriteLine(s);

        Console.WriteLine("{0}The lowercase of these values is:", Environment.NewLine);        

        foreach (string s in info)
            Console.WriteLine(s.ToLower());

        Console.WriteLine("{0}The uppercase of these values is:", Environment.NewLine);        

        foreach (string s in info)
            Console.WriteLine(s.ToUpper());
    }
}
// The example displays the following output:
//       The initial values in the array are:
//       Name
//       Title
//       Age
//       Location
//       Gender
//       
//       The lowercase of these values is:
//       name
//       title
//       age
//       location
//       gender
//       
//       The uppercase of these values is:
//       NAME
//       TITLE
//       AGE
//       LOCATION
//       GENDER
Imports System

Public Class ToLowerTest
    
    Public Shared Sub Main()
        Dim info As String() = {"Name", "Title", "Age", "Location", "Gender"}
        
        Console.WriteLine("The initial values in the array are:")

        Dim s As String
        For Each s In info
            Console.WriteLine(s)
        Next 

        Console.WriteLine("{0}The lowercase of these values is:", Environment.NewLine)

        For Each s In info
            Console.WriteLine(s.ToLower())
        Next 

        Console.WriteLine("{0}The uppercase of these values is:", Environment.NewLine)

        For Each s In  info
            Console.WriteLine(s.ToUpper())
        Next 
    End Sub 
End Class 
' The example displays the following output:
'       The initial values in the array are:
'       Name
'       Title
'       Age
'       Location
'       Gender
'       
'       The lowercase of these values is:
'       name
'       title
'       age
'       location
'       gender
'       
'       The uppercase of these values is:
'       NAME
'       TITLE
'       AGE
'       LOCATION
'       GENDER

Comentários

Esse método leva em conta as regras de maiusculas e minúsculas da cultura atual.This method takes into account the casing rules of the current culture.

Observação

Este método não altera o valor da instância atual.This method does not modify the value of the current instance. Em vez disso, ele retorna uma nova cadeia de caracteres na qual todos os caracteres na instância atual são convertidos em minúsculas.Instead, it returns a new string in which all characters in the current instance are converted to lowercase.

Considerações sobre segurançaSecurity Considerations

A operação de maiusculas e minúsculas que resulta de chamar o ToLower() método considera as convenções de capitalização da cultura atual.The casing operation that results from calling the ToLower() method takes the casing conventions of the current culture into account. Se você precisa da versão em maiuscula ou minúscula de um identificador de sistema operacional, como um nome de arquivo, chamado pipe ou chave do registro, use o ToLowerInvariant ou ToUpperInvariant métodos.If you need the lowercase or uppercase version of an operating system identifier, such as a file name, named pipe, or registry key, use the ToLowerInvariant or ToUpperInvariant methods. Isso produz o mesmo resultado em cada cultura (ao contrário de ToLower() método) e executa com mais eficiência.This produces the same result in every culture (unlike the ToLower() method) and performs more efficiently.

Notas aos Chamadores

Conforme explicado em práticas recomendadas para usar cadeias de caracteres, é recomendável que você evite chamar métodos de maiusculas e minúsculas de cadeia de caracteres que substituem valores padrão e chamam os métodos que exigem parâmetros a ser especificado explicitamente.As explained in Best Practices for Using Strings, we recommend that you avoid calling string casing methods that substitute default values and instead call methods that require parameters to be explicitly specified. Para converter um caractere em minúsculas usando as convenções de maiusculas e minúsculas da cultura atual, chame o ToLower(CultureInfo) sobrecarga de método com um valor de CurrentCulture para seu culture parâmetro.To convert a character to lowercase by using the casing conventions of the current culture, call the ToLower(CultureInfo) method overload with a value of CurrentCulture for its culture parameter.

Veja também

Aplica-se a