Char.GetUnicodeCategory Method

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Categorizes a Unicode character into a group identified by one of the UnicodeCategory values.

Overloads

GetUnicodeCategory(Char)	Categorizes a specified Unicode character into a group identified by one of the UnicodeCategory values.
GetUnicodeCategory(String, Int32)	Categorizes the character at the specified position in a specified string into a group identified by one of the UnicodeCategory values.

Examples

The following code example demonstrates GetUnicodeCategory.

using namespace System;
int main()
{
   char ch2 = '2';
   String^ str = "Upper Case";
   Console::WriteLine( Char::GetUnicodeCategory( 'a' ).ToString() ); // Output: S"LowercaseLetter"
   Console::WriteLine( Char::GetUnicodeCategory( ch2 ).ToString() ); // Output: S"DecimalDigitNumber"
   Console::WriteLine( Char::GetUnicodeCategory( str, 6 ).ToString() ); // Output: S"UppercaseLetter"
}

using System;

public class GetUnicodeCategorySample {
    public static void Main() {
        char ch2 = '2';
        string str = "Upper Case";

        Console.WriteLine(Char.GetUnicodeCategory('a'));		// Output: "LowercaseLetter"
        Console.WriteLine(Char.GetUnicodeCategory(ch2));		// Output: "DecimalDigitNumber"
        Console.WriteLine(Char.GetUnicodeCategory(str, 6));		// Output: "UppercaseLetter"
    }
}

open System

let ch2 = '2'
let str = "Upper Case"

printfn $"{Char.GetUnicodeCategory 'a'}"        // Output: "LowercaseLetter"
printfn $"{Char.GetUnicodeCategory ch2}"        // Output: "DecimalDigitNumber"
printfn $"{Char.GetUnicodeCategory(str, 6)}"    // Output: "UppercaseLetter"

Module GetUnicodeCategorySample

    Sub Main()

        Dim ch2 As Char
        ch2 = "2"c
        Dim str As String
        str = "Upper Case"

        Console.WriteLine(Char.GetUnicodeCategory("a"c))    ' Output: "1" (LowercaseLetter)
        Console.WriteLine(Char.GetUnicodeCategory(ch2))     ' Output: "8" (DecimalDigitNumber)
        Console.WriteLine(Char.GetUnicodeCategory(str, 6))  ' Output: "0" (UppercaseLetter)

    End Sub

End Module

GetUnicodeCategory(Char)

Source:

Char.cs

Categorizes a specified Unicode character into a group identified by one of the UnicodeCategory values.

public:
 static System::Globalization::UnicodeCategory GetUnicodeCategory(char c);

public static System.Globalization.UnicodeCategory GetUnicodeCategory (char c);

static member GetUnicodeCategory : char -> System.Globalization.UnicodeCategory

Public Shared Function GetUnicodeCategory (c As Char) As UnicodeCategory

Parameters

c

Char

The Unicode character to categorize.

Returns

UnicodeCategory

A UnicodeCategory value that identifies the group that contains c.

Remarks

The Char.GetUnicodeCategory method does not always return the same UnicodeCategory value as the CharUnicodeInfo.GetUnicodeCategory(Char) method when it is passed a particular character as a parameter. The CharUnicodeInfo.GetUnicodeCategory(Char) method is designed to reflect the current version of the Unicode standard. In contrast, although the Char.GetUnicodeCategory method usually reflects the current version of the Unicode standard, it may return a character's category based on a previous version of the standard or it may return a category that differs from the current standard in order to preserve backward compatibility. As a result, we recommend that you use the CharUnicodeInfo.GetUnicodeCategory(Char) method instead of Char.GetUnicodeCategory(Char).

Starting with .NET Framework 4.6.2, Unicode characters are classified based on The Unicode Standard, Version 8.0.0. In versions of the .NET Framework from the .NET Framework 4 to the .NET Framework 4.6.1, they are classified based on The Unicode Standard, Version 6.3.0.

See also

• GetUnicodeCategory(Rune)
• GetUnicodeCategory(Char)

GetUnicodeCategory(String, Int32)

Source:

Char.cs

Categorizes the character at the specified position in a specified string into a group identified by one of the UnicodeCategory values.

public:
 static System::Globalization::UnicodeCategory GetUnicodeCategory(System::String ^ s, int index);

public static System.Globalization.UnicodeCategory GetUnicodeCategory (string s, int index);

static member GetUnicodeCategory : string * int -> System.Globalization.UnicodeCategory

Public Shared Function GetUnicodeCategory (s As String, index As Integer) As UnicodeCategory

Parameters

s

String

A String.

index

Int32

The character position in s.

Returns

UnicodeCategory

A UnicodeCategory enumerated constant that identifies the group that contains the character at position index in s.

Exceptions

ArgumentNullException

s is null.

ArgumentOutOfRangeException

index is less than zero or greater than the last position in s.

Remarks

Character positions in a string are indexed starting from zero.

The Char.GetUnicodeCategory method does not always return the same UnicodeCategory value as the CharUnicodeInfo.GetUnicodeCategory(String, Int32) method when it is passed a particular character as a parameter. The CharUnicodeInfo.GetUnicodeCategory(String, Int32) method is designed to reflect the current version of the Unicode standard. In contrast, although the Char.GetUnicodeCategory method usually reflects the current version of the Unicode standard, it may return a character's category based on a previous version of the standard or it may return a category that differs from the current standard in order to preserve backward compatibility. As a result, we recommend that you use the CharUnicodeInfo.GetUnicodeCategory(Char) method instead of Char.GetUnicodeCategory(String, Int32).

Starting with .NET Framework 4.6.2, Unicode characters are classified based on The Unicode Standard, Version 8.0.0. In versions of the .NET Framework from the .NET Framework 4 to the .NET Framework 4.6.1, they are classified based on The Unicode Standard, Version 6.3.0.

See also

• GetUnicodeCategory(Char)