CharUnicodeInfo::GetUnicodeCategory Method (Char)
Gets the Unicode category of the specified character.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- ch
- Type: System::Char
The Unicode character for which to get the Unicode category.
Return Value
Type: System.Globalization::UnicodeCategoryA UnicodeCategory value indicating the category of the specified character.
The Unicode characters are divided into categories. A character's category is one of its properties. For example, a character might be an uppercase letter, a lowercase letter, a decimal digit number, a letter number, a connector punctuation, a math symbol, or a currency symbol. The UnicodeCategory class returns the category of a Unicode character. For more information on Unicode characters, see the Unicode Standard.
The GetUnicodeCategory method assumes that ch corresponds to a single linguistic character and returns its category. This means that, for surrogate pairs, it returns UnicodeCategory::Surrogate instead of the category to which the surrogate belongs. For example, the Ugaritic alphabet occupies code points U+10380 to U+1039F. The following example uses the ConvertFromUtf32 method to instantiate a string that represents UGARITIC LETTER ALPA (U+10380), which is the first letter of the Ugaritic alphabet. As the output from the example shows, the IsNumber method returns false if it is passed either the high surrogate or the low surrogate of this character.
Note that CharUnicodeInfo::GetUnicodeCategory does not always return the same UnicodeCategory value as the Char::GetUnicodeCategory method when passed a particular character as a parameter. The CharUnicodeInfo::GetUnicodeCategory 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 might return a character's category based on a previous version of the standard, or it might return a category that differs from the current standard to preserve backward compatibility.
The following example shows the values returned by each method for different types of characters.
using namespace System; using namespace System::Globalization; void PrintProperties( Char c ); int main() { Console::WriteLine( " c Num Dig Dec UnicodeCategory" ); Console::Write( "U+0061 LATIN SMALL LETTER A " ); PrintProperties( L'a' ); Console::Write( "U+0393 GREEK CAPITAL LETTER GAMMA " ); PrintProperties( L'\u0393' ); Console::Write( "U+0039 DIGIT NINE " ); PrintProperties( L'9' ); Console::Write( "U+00B2 SUPERSCRIPT TWO " ); PrintProperties( L'\u00B2' ); Console::Write( "U+00BC VULGAR FRACTION ONE QUARTER " ); PrintProperties( L'\u00BC' ); Console::Write( "U+0BEF TAMIL DIGIT NINE " ); PrintProperties( L'\u0BEF' ); Console::Write( "U+0BF0 TAMIL NUMBER TEN " ); PrintProperties( L'\u0BF0' ); Console::Write( "U+0F33 TIBETAN DIGIT HALF ZERO " ); PrintProperties( L'\u0F33' ); Console::Write( "U+2788 CIRCLED SANS-SERIF DIGIT NINE " ); PrintProperties( L'\u2788' ); } void PrintProperties( Char c ) { 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 ) ); } /* 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 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.