Char.ToUpper Char.ToUpper Char.ToUpper Char.ToUpper Method

Definition

Converts the value of a Unicode character to its uppercase equivalent.

Overloads

ToUpper(Char, CultureInfo) ToUpper(Char, CultureInfo) ToUpper(Char, CultureInfo) ToUpper(Char, CultureInfo)

Converts the value of a specified Unicode character to its uppercase equivalent using specified culture-specific formatting information.

ToUpper(Char) ToUpper(Char) ToUpper(Char) ToUpper(Char)

Converts the value of a Unicode character to its uppercase equivalent.

ToUpper(Char, CultureInfo) ToUpper(Char, CultureInfo) ToUpper(Char, CultureInfo) ToUpper(Char, CultureInfo)

Converts the value of a specified Unicode character to its uppercase equivalent using specified culture-specific formatting information.

public:
 static char ToUpper(char c, System::Globalization::CultureInfo ^ culture);
public static char ToUpper (char c, System.Globalization.CultureInfo culture);
static member ToUpper : char * System.Globalization.CultureInfo -> char
Public Shared Function ToUpper (c As Char, culture As CultureInfo) As Char

Parameters

c
Char Char Char Char

The Unicode character to convert.

culture
CultureInfo CultureInfo CultureInfo CultureInfo

An object that supplies culture-specific casing rules.

Returns

The uppercase equivalent of c, modified according to culture, or the unchanged value of c if c is already uppercase, has no uppercase equivalent, or is not alphabetic.

Exceptions

Examples

The following example converts each character in an array to its uppercase equivalent for the en-US culture, the invariant culture, and the tr-TR culture. In this example, the uppercase equivalent of each lowercase letter is identical for all cultures except for one case. The lowercase "i" character (U+0069) converts to "I" (U+0049) in the en-US and invariant cultures, but to "İ" (U+0130) in the tr-TR culture.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      CultureInfo[] cultures= { CultureInfo.CreateSpecificCulture("en-US"), 
                                CultureInfo.InvariantCulture, 
                                CultureInfo.CreateSpecificCulture("tr-TR") };
      Char[] chars = {'ä', 'e', 'E', 'i', 'I' };

      Console.WriteLine("Character     en-US     Invariant     tr-TR");
      foreach (var ch in chars) {
         Console.Write("    {0}", ch);
         foreach (var culture in cultures) 
            Console.Write("{0,12}", Char.ToUpper(ch, culture));

         Console.WriteLine();
      }   
   }
}
// The example displays the following output:
//       Character     en-US     Invariant     tr-TR
//           ä           Ä           Ä           Ä
//           e           E           E           E
//           E           E           E           E
//           i           I           I           İ
//           I           I           I           I
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim cultures() As CultureInfo = { CultureInfo.CreateSpecificCulture("en-US"), 
                                        CultureInfo.InvariantCulture, 
                                        CultureInfo.CreateSpecificCulture("tr-TR") }
      Dim chars() As Char = {"ä"c, "e"c, "E"c, "i"c, "I"c }

      Console.WriteLine("Character     en-US     Invariant     tr-TR")
      For Each ch In chars
         Console.Write("    {0}", ch)
         For Each culture In cultures
            Console.Write("{0,12}", Char.ToUpper(ch, culture))
         Next
         Console.WriteLine()
      Next   
   End Sub
End Module
' The example displays the following output:
'       Character     en-US     Invariant     tr-TR
'           ä           Ä           Ä           Ä
'           e           E           E           E
'           E           E           E           E
'           i           I           I           İ
'           I           I           I           I    

Remarks

Use String.ToUpper to convert a string to uppercase.

See also

ToUpper(Char) ToUpper(Char) ToUpper(Char) ToUpper(Char)

Converts the value of a Unicode character to its uppercase equivalent.

public:
 static char ToUpper(char c);
public static char ToUpper (char c);
static member ToUpper : char -> char
Public Shared Function ToUpper (c As Char) As Char

Parameters

c
Char Char Char Char

The Unicode character to convert.

Returns

The uppercase equivalent of c, or the unchanged value of c if c is already uppercase, has no uppercase equivalent, or is not alphabetic.

Examples

The following example converts each character in an array to its uppercase equivalent.

using System;

public class Example
{
   public static void Main()
   {
      char[] chars = { 'e', 'E', '6', ',', 'ж', 'ä' };
      foreach (var ch in chars)
          Console.WriteLine("{0} --> {1} {2}", ch, Char.ToUpper(ch),
                            ch == Char.ToUpper(ch) ? "(Same Character)" : "" );
   }
}
// The example displays the following output:
//       e --> E
//       E --> E (Same Character)
//       6 --> 6 (Same Character)
//       , --> , (Same Character)
//       ? --> ?
//       ä --> Ä
Module Example
   Public Sub Main()
      Dim chars() As Char = { "e"c, "E"c, "6"c, ","c, "ж"c, "ä"c }
      For Each ch In chars
         Console.WriteLine("{0} --> {1} {2}", ch, Char.ToUpper(ch),
                           If(ch = Char.ToUpper(ch), "(Same Character)", ""))
      Next
   End Sub
End Module
' The example displays the following output:
'       e --> E
'       E --> E (Same Character)
'       6 --> 6 (Same Character)
'       , --> , (Same Character)
'       ж --> Ж
'       ä --> Ä

Remarks

Casing rules are obtained from the current culture.

Use String.ToUpper to convert a string to uppercase.

Notes to Callers

As explained in Best Practices for Using Strings, we recommend that you avoid calling character-casing and string-casing methods that substitute default values. Instead, you should call methods that require parameters to be explicitly specified. To convert a character to uppercase by using the casing conventions of the current culture, call the ToUpper(Char, CultureInfo) method overload with a value of CurrentCulture for its culture parameter.

See also

Applies to