CharUnicodeInfo.GetUnicodeCategory 方法

定义

命名空间:: System.Globalization

程序集:: mscorlib.dll, System.Globalization.dll

程序集:: netstandard.dll, System.Runtime.dll

程序集:: System.Globalization.dll

程序集:: System.Runtime.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

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获取 Unicode 字符的 Unicode 类别。

重载

名称	说明
GetUnicodeCategory(Char)	获取指定字符的 Unicode 类别。
GetUnicodeCategory(Int32)	获取指定字符的 Unicode 类别。
GetUnicodeCategory(String, Int32)	获取指定字符串的指定索引处字符的 Unicode 类别。

GetUnicodeCategory(Char)

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

获取指定字符的 Unicode 类别。

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

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

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

Public Shared Function GetUnicodeCategory (ch As Char) As UnicodeCategory

参数

ch: Char

要为其获取 Unicode 类别的 Unicode 字符。

UnicodeCategory

一个 UnicodeCategory 值，指示指定字符的类别。

示例

下面的代码示例显示了每种方法针对不同类型的字符返回的值。

using System;
using System.Globalization;

public class SamplesCharUnicodeInfo  {

   public static void Main()  {

      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' );
   }

   public static 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       Γ   -1    -1    -1   UppercaseLetter
U+0039 DIGIT NINE                       9   9     9     9    DecimalDigitNumber
U+00B2 SUPERSCRIPT TWO                  ²   2     2     -1   OtherNumber
U+00BC VULGAR FRACTION ONE QUARTER      ¼   0.25  -1    -1   OtherNumber
U+0BEF TAMIL DIGIT NINE                 ௯   9     9     9    DecimalDigitNumber
U+0BF0 TAMIL NUMBER TEN                 ௰   10    -1    -1   OtherNumber
U+0F33 TIBETAN DIGIT HALF ZERO          ༳   -0.5  -1    -1   OtherNumber
U+2788 CIRCLED SANS-SERIF DIGIT NINE    ➈   9     9     -1   OtherNumber

*/

Imports System.Globalization

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

   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

End Class


'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       Γ   -1    -1    -1   UppercaseLetter
'U+0039 DIGIT NINE                       9   9     9     9    DecimalDigitNumber
'U+00B2 SUPERSCRIPT TWO                  ²   2     2     -1   OtherNumber
'U+00BC VULGAR FRACTION ONE QUARTER      ¼   0.25  -1    -1   OtherNumber
'U+0BEF TAMIL DIGIT NINE                 ௯   9     9     9    DecimalDigitNumber
'U+0BF0 TAMIL NUMBER TEN                 ௰   10    -1    -1   OtherNumber
'U+0F33 TIBETAN DIGIT HALF ZERO          ༳   -0.5  -1    -1   OtherNumber
'U+2788 CIRCLED SANS-SERIF DIGIT NINE    ➈   9     9     -1   OtherNumber

注解

Unicode 字符分为类别。字符的类别是其属性之一。例如，字符可以是大写字母、小写字母、十进制数字、字母数字、连接符标点符号、数学符号或货币符号。 UnicodeCategory枚举定义 Unicode 字符的类别。有关 Unicode 字符的详细信息，请参阅 Unicode 标准。

该方法 GetUnicodeCategory 假定对应于 ch 单个语言字符并返回其类别。这意味着，对于代理项对，它返回 UnicodeCategory.Surrogate 而不是代理项所属的类别。例如，Ugaritic 字母表占用代码点 U+10380 到 U+1039F。下面的示例使用该方法 ConvertFromUtf32 实例化一个表示 UGARITIC LETTER ALPA（U+10380）的字符串，该字符串是乌加里字母的第一个字母。如示例中的输出所示，如果传递了高代理项或此字符的低代理项，该方法 IsNumber(Char) 将 false 返回该方法。

int utf32 = 0x10380;       // UGARITIC LETTER ALPA
string surrogate = Char.ConvertFromUtf32(utf32);
foreach (var ch in surrogate)
    Console.WriteLine($"U+{(ushort)ch:X4}: {System.Globalization.CharUnicodeInfo.GetUnicodeCategory(ch):G}");
// The example displays the following output:
//       U+D800: Surrogate
//       U+DF80: Surrogate

Dim utf32 As Integer = &h10380       ' UGARITIC LETTER ALPA
Dim surrogate As String = Char.ConvertFromUtf32(utf32)
For Each ch In surrogate
   Console.WriteLine("U+{0:X4}: {1:G}", 
                     Convert.ToUInt16(ch), 
                     System.Globalization.CharUnicodeInfo.GetUnicodeCategory(ch))
Next
' The example displays the following output:
'       U+D800: Surrogate
'       U+DF80: Surrogate

请注意， CharUnicodeInfo.GetUnicodeCategory 在将特定字符作为参数传递时，并不总是返回与方法相同的 UnicodeCategory 值 Char.GetUnicodeCategory 。该方法 CharUnicodeInfo.GetUnicodeCategory 旨在反映 Unicode 标准的当前版本。相比之下，虽然 Char.GetUnicodeCategory 该方法通常反映 Unicode 标准的当前版本，但它可能会基于标准以前的版本返回字符的类别，或者可能会返回不同于当前标准的类别以保持向后兼容性。

另请参阅

UnicodeCategory

适用于

GetUnicodeCategory(Int32)

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

获取指定字符的 Unicode 类别。

public:
 static System::Globalization::UnicodeCategory GetUnicodeCategory(int codePoint);

public static System.Globalization.UnicodeCategory GetUnicodeCategory(int codePoint);

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

Public Shared Function GetUnicodeCategory (codePoint As Integer) As UnicodeCategory

参数

codePoint: Int32

一个数字，表示 Unicode 字符的 32 位代码点值。

UnicodeCategory

一个 UnicodeCategory 值，指示指定字符的类别。

适用于

GetUnicodeCategory(String, Int32)

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

Source:: CharUnicodeInfo.cs

获取指定字符串的指定索引处字符的 Unicode 类别。

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

参数

s: String

String包含要为其获取 Unicode 类别的 Unicode 字符。

index: Int32

要为其获取 Unicode 类别的 Unicode 字符的索引。

UnicodeCategory

一个 UnicodeCategory 值，指示指定字符串的指定索引处字符的类别。

例外

ArgumentNullException

s 是 null。

ArgumentOutOfRangeException

index 位于有效索引 s范围之外。

示例

下面的代码示例显示了每种方法针对不同类型的字符返回的值。

using System;
using System.Globalization;

public class SamplesCharUnicodeInfo  {

   public static void Main()  {

      // The String to get information for.
      String s = "a9\u0393\u00B2\u00BC\u0BEF\u0BF0\u2788";
      Console.WriteLine( "String: {0}", s );

      // Print the values for each of the characters in the string.
      Console.WriteLine( "index c  Num   Dig   Dec   UnicodeCategory" );
      for ( int i = 0; i < s.Length; i++ )  {
         Console.Write( "{0,-5} {1,-3}", i, s[i] );
         Console.Write( " {0,-5}", CharUnicodeInfo.GetNumericValue( s, i ) );
         Console.Write( " {0,-5}", CharUnicodeInfo.GetDigitValue( s, i ) );
         Console.Write( " {0,-5}", CharUnicodeInfo.GetDecimalDigitValue( s, i ) );
         Console.WriteLine( "{0}", CharUnicodeInfo.GetUnicodeCategory( s, i ) );
      }
   }
}


/*
This code produces the following output.  Some characters might not display at the console.

String: a9Γ²¼௯௰➈
index c  Num   Dig   Dec   UnicodeCategory
0     a   -1    -1    -1   LowercaseLetter
1     9   9     9     9    DecimalDigitNumber
2     Γ   -1    -1    -1   UppercaseLetter
3     ²   2     2     -1   OtherNumber
4     ¼   0.25  -1    -1   OtherNumber
5     ௯   9     9     9    DecimalDigitNumber
6     ௰   10    -1    -1   OtherNumber
7     ➈   9     9     -1   OtherNumber

*/

Imports System.Globalization

Public Class SamplesCharUnicodeInfo

   Public Shared Sub Main()

      ' The String to get information for.
      Dim s As [String] = "a9\u0393\u00B2\u00BC\u0BEF\u0BF0\u2788"
      Console.WriteLine("String: {0}", s)

      ' Print the values for each of the characters in the string.
      Console.WriteLine("index c  Num   Dig   Dec   UnicodeCategory")
      Dim i As Integer
      For i = 0 To s.Length - 1
         Console.Write("{0,-5} {1,-3}", i, s(i))
         Console.Write(" {0,-5}", CharUnicodeInfo.GetNumericValue(s, i))
         Console.Write(" {0,-5}", CharUnicodeInfo.GetDigitValue(s, i))
         Console.Write(" {0,-5}", CharUnicodeInfo.GetDecimalDigitValue(s, i))
         Console.WriteLine("{0}", CharUnicodeInfo.GetUnicodeCategory(s, i))
      Next i

   End Sub

End Class


'This code produces the following output.  Some characters might not display at the console.
'
'String: a9Γ²¼௯௰➈
'index c  Num   Dig   Dec   UnicodeCategory
'0     a   -1    -1    -1   LowercaseLetter
'1     9   9     9     9    DecimalDigitNumber
'2     Γ   -1    -1    -1   UppercaseLetter
'3     ²   2     2     -1   OtherNumber
'4     ¼   0.25  -1    -1   OtherNumber
'5     ௯   9     9     9    DecimalDigitNumber
'6     ௰   10    -1    -1   OtherNumber
'7     ➈   9     9     -1   OtherNumber

注解

Char如果位于位置index的对象是有效代理项对的第一个字符，该方法GetUnicodeCategory(String, Int32)将返回代理项对的 Unicode 类别，而不是返回UnicodeCategory.Surrogate。例如，Ugaritic 字母表占用代码点 U+10380 到 U+1039F。下面的示例使用该方法 ConvertFromUtf32 实例化一个表示 UGARITIC LETTER ALPA（U+10380）的字符串，该字符串是乌加里字母的第一个字母。如示例中的输出所示， GetUnicodeCategory(String, Int32) 如果该方法传递了此字符的高代理项，则返回 UnicodeCategory.OtherLetter 该方法，该代理项指示它考虑代理项对。但是，如果它通过低代理项，则它只考虑隔离中的低代理项并返回 UnicodeCategory.Surrogate。

int utf32 = 0x10380;       // UGARITIC LETTER ALPA
string surrogate = Char.ConvertFromUtf32(utf32);
for (int ctr = 0; ctr < surrogate.Length; ctr++)
    Console.WriteLine($"U+{(ushort)surrogate[ctr]:X4}: {System.Globalization.CharUnicodeInfo.GetUnicodeCategory(surrogate, ctr):G}");
// The example displays the following output:
//       U+D800: OtherLetter
//       U+DF80: Surrogate

Dim utf32 As Integer = &h10380       ' UGARITIC LETTER ALPA
Dim surrogate As String = Char.ConvertFromUtf32(utf32)
For ctr As Integer = 0 To surrogate.Length - 1
   Console.WriteLine("U+{0:X4}: {1:G}", 
                     Convert.ToUInt16(surrogate(ctr)), 
                     System.Globalization.CharUnicodeInfo.GetUnicodeCategory(surrogate, ctr))
Next
' The example displays the following output:
'       U+D800: OtherLetter
'       U+DF80: Surrogate

请注意， CharUnicodeInfo.GetUnicodeCategory 在将特定字符作为参数传递时，方法并不总是返回与该方法相同的 UnicodeCategory 值 Char.GetUnicodeCategory 。该方法 CharUnicodeInfo.GetUnicodeCategory 旨在反映 Unicode 标准的当前版本。相比之下，虽然 Char.GetUnicodeCategory 该方法通常反映 Unicode 标准的当前版本，但它可能会基于标准以前的版本返回字符的类别，或者可能会返回不同于当前标准的类别以保持向后兼容性。

另请参阅

UnicodeCategory

适用于

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