CharUnicodeInfo Class
Assembly: mscorlib (in mscorlib.dll)
The Unicode standard defines several properties for Unicode characters, and one such property is the character's category. For example, a character might be categorized as an uppercase letter, a lowercase letter, a decimal digit number, a letter number, a connector punctuation, a math symbol, or a currency symbol. Your application can use the character's category to govern string-based operations such as parsing.
The UnicodeCategory enumeration specifies the Unicode categories for characters. Use the CharUnicodeInfo class to obtain the UnicodeCategory value for a specific character.
The CharUnicodeInfo class returns the following Unicode character properties:
-
Numeric value is a Unicode character property that applies only to numeric characters, which include fractions, subscripts, superscripts, Roman numerals, currency numerators, encircled numbers, and script-specific digits.
-
Digit value is a property that applies only to numeric characters that can be used as digits. A digit is a numeric character that can be combined with other digits to represent a whole number in a numbering system.
-
Decimal digit value is a property that applies only to decimal digits. A decimal digit is a digit in the decimal (base-10) system that can be one of ten digits, from zero through nine.
For more information on Unicode characters, see the Unicode Standard.
The following code example shows the values returned by each method for different types of characters.
Imports System Imports System.Globalization Imports Microsoft.VisualBasic Public Class SamplesCharUnicodeInfo Public Shared Sub Main() Console.WriteLine(" c Num Dig Dec UnicodeCategory") Console.Write("U+0061 LATIN SMALL LETTER A ") PrintProperties("a"c) Console.Write("U+0393 GREEK CAPITAL LETTER GAMMA ") PrintProperties(ChrW(&H0393)) Console.Write("U+0039 DIGIT NINE ") PrintProperties("9"c) Console.Write("U+00B2 SUPERSCRIPT TWO ") PrintProperties(ChrW(&H00B2)) Console.Write("U+00BC VULGAR FRACTION ONE QUARTER ") PrintProperties(ChrW(&H00BC)) Console.Write("U+0BEF TAMIL DIGIT NINE ") PrintProperties(ChrW(&H0BEF)) Console.Write("U+0BF0 TAMIL NUMBER TEN ") PrintProperties(ChrW(&H0BF0)) Console.Write("U+0F33 TIBETAN DIGIT HALF ZERO ") PrintProperties(ChrW(&H0F33)) Console.Write("U+2788 CIRCLED SANS-SERIF DIGIT NINE ") PrintProperties(ChrW(&H2788)) End Sub 'Main Public Shared Sub PrintProperties(c As Char) Console.Write(" {0,-3}", c) Console.Write(" {0,-5}", CharUnicodeInfo.GetNumericValue(c)) Console.Write(" {0,-5}", CharUnicodeInfo.GetDigitValue(c)) Console.Write(" {0,-5}", CharUnicodeInfo.GetDecimalDigitValue(c)) Console.WriteLine("{0}", CharUnicodeInfo.GetUnicodeCategory(c)) End Sub 'PrintProperties End Class 'SamplesCharUnicodeInfo 'This code produces the following output. Some characters might not display at the console. ' ' c Num Dig Dec UnicodeCategory 'U+0061 LATIN SMALL LETTER A a -1 -1 -1 LowercaseLetter 'U+0393 GREEK CAPITAL LETTER GAMMA \u0393 -1 -1 -1 UppercaseLetter 'U+0039 DIGIT NINE 9 9 9 9 DecimalDigitNumber 'U+00B2 SUPERSCRIPT TWO \u00B2 2 2 2 OtherNumber 'U+00BC VULGAR FRACTION ONE QUARTER \u00BC 0.25 -1 -1 OtherNumber 'U+0BEF TAMIL DIGIT NINE \u0BEF 9 9 9 DecimalDigitNumber 'U+0BF0 TAMIL NUMBER TEN \u0BF0 10 -1 -1 OtherNumber 'U+0F33 TIBETAN DIGIT HALF ZERO \u0F33 -0.5 -1 -1 OtherNumber 'U+2788 CIRCLED SANS-SERIF DIGIT NINE \u2788 9 9 -1 OtherNumber
import System.* ;
import System.Globalization.* ;
public class SamplesCharUnicodeInfo
{
public static void main(String[] args)
{
Console.WriteLine(" c Num "
+ " Dig Dec UnicodeCategory");
Console.Write("U+0061 LATIN SMALL LETTER A ");
PrintProperties('a');
Console.Write("U+0393 GREEK CAPITAL LETTER GAMMA ");
PrintProperties('\u0393');
Console.Write("U+0039 DIGIT NINE ");
PrintProperties('9');
Console.Write("U+00B2 SUPERSCRIPT TWO ");
PrintProperties('\u00B2');
Console.Write("U+00BC VULGAR FRACTION ONE QUARTER ");
PrintProperties('\u00BC');
Console.Write("U+0BEF TAMIL DIGIT NINE ");
PrintProperties('\u0BEF');
Console.Write("U+0BF0 TAMIL NUMBER TEN ");
PrintProperties('\u0BF0');
Console.Write("U+0F33 TIBETAN DIGIT HALF ZERO ");
PrintProperties('\u0F33');
Console.Write("U+2788 CIRCLED SANS-SERIF DIGIT NINE ");
PrintProperties('\u2788');
} //main
public static void PrintProperties(char c)
{
Console.Write(" {0,-3}", System.Convert.ToString( c));
Console.Write(" {0,-5}",
System.Convert.ToString(CharUnicodeInfo.GetNumericValue(c)));
Console.Write(" {0,-5}",
System.Convert.ToString(CharUnicodeInfo.GetDigitValue(c)));
Console.Write(" {0,-5}",
System.Convert.ToString( CharUnicodeInfo.GetDecimalDigitValue(c)));
Console.WriteLine("{0}",
System.Convert.ToString(CharUnicodeInfo.GetUnicodeCategory(c)));
} //PrintProperties
} //SamplesCharUnicodeInfo
/*
This code produces the following output.
Some characters might not display at the console.
c Num Dig Dec UnicodeCategory
U+0061 LATIN SMALL LETTER A a -1 -1 -1 LowercaseLetter
U+0393 GREEK CAPITAL LETTER GAMMA \u0393 -1 -1 -1
UppercaseLetter
U+0039 DIGIT NINE 9 9 9 9 DecimalDigitNumber
U+00B2 SUPERSCRIPT TWO \u00B2 2 2 2 OtherNumber
U+00BC VULGAR FRACTION ONE QUARTER \u00BC 0.25 -1 -1 OtherNumber
U+0BEF TAMIL DIGIT NINE \u0BEF 9 9 9
DecimalDigitNumber
U+0BF0 TAMIL NUMBER TEN \u0BF0 10 -1 -1 OtherNumber
U+0F33 TIBETAN DIGIT HALF ZERO \u0F33 -0.5 -1 -1 OtherNumber
U+2788 CIRCLED SANS-SERIF DIGIT NINE \u2788 9 9 -1 OtherNumber
*/
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.