String.ToLower Metodo

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

public:
 System::String ^ ToLower();

public string ToLower();

member this.ToLower : unit -> string

Public Function ToLower () As String

Valori restituiti

Stringa in minuscolo.

Esempio

Nell'esempio seguente vengono convertite diverse stringhe maiuscole e minuscole in lettere minuscole.

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

open System

let info = [| "Name"; "Title"; "Age"; "Location"; "Gender" |]

printfn "The initial values in the array are:"
for s in info do
    printfn $"{s}"

printfn $"{Environment.NewLine}The lowercase of these values is:"

for s in info do
    printfn $"{s.ToLower()}"

printfn $"{Environment.NewLine}The uppercase of these values is:"

for s in info do
    printfn $"{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

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

' 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

Commenti

Questo metodo tiene conto delle regole di maiuscole e minuscole delle impostazioni cultura correnti.

L'operazione di maiuscole e minuscole risultante dalla chiamata al ToLower() metodo tiene conto delle convenzioni di maiuscole e minuscole delle impostazioni cultura correnti. Se è necessaria la versione minuscola o maiuscola di un identificatore del sistema operativo, ad esempio un nome file, una named pipe o una chiave del Registro di sistema, usare i ToLowerInvariant metodi o ToUpperInvariant . Questo produce lo stesso risultato in tutte le impostazioni cultura (a differenza del ToLower() metodo) ed esegue in modo più efficiente.

Note per i chiamanti

Come illustrato in Procedure consigliate per l'uso di stringhe, è consigliabile evitare di chiamare metodi di combinazione di maiuscole e minuscole di stringhe che sostituiscono i valori predefiniti e chiamare invece metodi che richiedono parametri da specificare in modo esplicito. Per convertire un carattere in minuscolo usando le convenzioni di maiuscole e minuscole delle impostazioni cultura correnti, segnalare in modo esplicito l'intenzione chiamando l'overload del ToLower(CultureInfo) metodo con un valore di CurrentCulture per il relativo culture parametro. Se non è necessario un confronto con riconoscimento linguistico, è consigliabile usare Ordinal.

Vedi anche

• ToLowerInvariant()
• ToUpper()
• ToUpperInvariant()

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

Origine:

String.Manipulation.cs

public:
 System::String ^ ToLower(System::Globalization::CultureInfo ^ culture);

public 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

Parametri

Valori restituiti

Equivalente minuscolo della stringa corrente.

Esempio

Nell'esempio seguente vengono convertite due stringhe di caratteri maiuscoli in caratteri minuscoli usando le impostazioni cultura English-United Stati e Turkish-Turkey, quindi confronta le stringhe minuscole. Le stringhe maiuscole sono identiche, ad eccezione del fatto che per ogni occorrenza della LETTERA MAIUSCOLA UNICODE I in una stringa, l'altra stringa contiene LA LETTERA MAIUSCOLA LATINA I CON PUNTO SOPRA.

// 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)

open System
open System.Globalization

let codePoints title s =
     printf $"{Environment.NewLine}The code points in {title} are: {Environment.NewLine}"
     for u in s do
          printf $"{u:x4} "
     printfn ""

let str1 = "INDIGO"
// str2 = str1, except each 'I' is '\u0130' (Unicode LATIN CAPITAL I WITH DOT ABOVE).
let str2 = String [| '\u0130'; 'N'; 'D'; '\u0130'; 'G'; 'O' |]

printfn $"\nstr1 = '{str1}'\n"

printfn $"""str1 is {if 0 = String.CompareOrdinal(str1, str2) then "equal" else "not equal"} to str2."""
codePoints "str1" str1
codePoints "str2" str2

// str3 is a lower case copy of str2, using English-United States culture.
printfn "\nstr3 = Lower case copy of str2 using English-United States culture."
let str3 = str2.ToLower(CultureInfo("en-US", false))

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

// Compare the code points in str3 and str4.
printfn $"""\nstr3 is {if 0 = String.CompareOrdinal(str3, str4) then "equal" else "not equal"} to str4."""
     
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
*)

Public Shared Sub Run()
    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(&H130), "N"c, "D"c, ChrW(&H130), "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

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

'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

Commenti

Le regole di maiuscole e minuscole delle impostazioni cultura specificate dal culture parametro determinano la modalità di modifica della combinazione di maiuscole e minuscole della stringa.

Se si passa il ToLower(CultureInfo) metodo un CultureInfo oggetto diverso da CultureInfo.InvariantCulture, l'operazione di combinazione di maiuscole e minuscole prenderà in considerazione le regole specifiche delle impostazioni cultura. Se è necessaria la versione minuscola o maiuscola di un identificatore del sistema operativo, ad esempio un nome file, una named pipe o una chiave del Registro di sistema, usare il ToLowerInvariant metodo o ToUpperInvariant . Questo produce lo stesso risultato in tutte le impostazioni cultura ed esegue in modo più efficiente.

Vedi anche

• CultureInfo
• ToUpper()