StringInfo StringInfo StringInfo StringInfo Class

Definição

Fornece a funcionalidade para dividir uma cadeia de caracteres em elementos de texto e percorrê-los.Provides functionality to split a string into text elements and to iterate through those text elements.

public ref class StringInfo
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class StringInfo
type StringInfo = class
Public Class StringInfo
Herança
StringInfoStringInfoStringInfoStringInfo
Atributos

Exemplos

Este exemplo usa o GetTextElementEnumerator e ParseCombiningCharacters métodos do StringInfo classe para manipular uma cadeia de caracteres que contém substitutos e caracteres sem espaçamento.This example uses the GetTextElementEnumerator and ParseCombiningCharacters methods of the StringInfo class to manipulate a string that contains surrogate and combining characters.

using namespace System;
using namespace System::Text;
using namespace System::Globalization;


// Show how to enumerate each real character (honoring surrogates)
// in a string.

void EnumTextElements(String^ combiningChars)
{
    // This StringBuilder holds the output results.
    StringBuilder^ sb = gcnew StringBuilder();

    // Use the enumerator returned from GetTextElementEnumerator
    // method to examine each real character.
    TextElementEnumerator^ charEnum =
        StringInfo::GetTextElementEnumerator(combiningChars);
    while (charEnum->MoveNext())
    {
        sb->AppendFormat("Character at index {0} is '{1}'{2}", 
            charEnum->ElementIndex, charEnum->GetTextElement(), 
            Environment::NewLine);
    }

    // Show the results.
    Console::WriteLine("Result of GetTextElementEnumerator:");
    Console::WriteLine(sb);
}


// Show how to discover the index of each real character
// (honoring surrogates) in a string.

void EnumTextElementIndexes(String^ combiningChars)
{
    // This StringBuilder holds the output results.
    StringBuilder^ sb = gcnew StringBuilder();

    // Use the ParseCombiningCharacters method to
    // get the index of each real character in the string.
    array <int>^ textElemIndex =
        StringInfo::ParseCombiningCharacters(combiningChars);

    // Iterate through each real character showing the character
    // and the index where it was found.
    for (int i = 0; i < textElemIndex->Length; i++)
    {
        sb->AppendFormat("Character {0} starts at index {1}{2}",
            i, textElemIndex[i], Environment::NewLine);
    }

    // Show the results.
    Console::WriteLine("Result of ParseCombiningCharacters:");
    Console::WriteLine(sb);
}

int main()
{

    // The string below contains combining characters.
    String^ combiningChars = L"a\u0304\u0308bc\u0327";

    // Show each 'character' in the string.
    EnumTextElements(combiningChars);

    // Show the index in the string where each 'character' starts.
    EnumTextElementIndexes(combiningChars);

};

// This code produces the following output.
//
// Result of GetTextElementEnumerator:
// Character at index 0 is 'a-"'
// Character at index 3 is 'b'
// Character at index 4 is 'c,'
//
// Result of ParseCombiningCharacters:
// Character 0 starts at index 0
// Character 1 starts at index 3
// Character 2 starts at index 4
using System;
using System.Text;
using System.Globalization;

public sealed class App {
   static void Main() {
      // The string below contains combining characters.
      String s = "a\u0304\u0308bc\u0327";

      // Show each 'character' in the string.
      EnumTextElements(s);

      // Show the index in the string where each 'character' starts.
      EnumTextElementIndexes(s);
   }

   // Show how to enumerate each real character (honoring surrogates) in a string.
   static void EnumTextElements(String s) {
      // This StringBuilder holds the output results.
      StringBuilder sb = new StringBuilder();

      // Use the enumerator returned from GetTextElementEnumerator 
      // method to examine each real character.
      TextElementEnumerator charEnum = StringInfo.GetTextElementEnumerator(s);
      while (charEnum.MoveNext()) {
         sb.AppendFormat(
           "Character at index {0} is '{1}'{2}",
           charEnum.ElementIndex, charEnum.GetTextElement(),
           Environment.NewLine);
      }

      // Show the results.
      Console.WriteLine("Result of GetTextElementEnumerator:");
      Console.WriteLine(sb);
   }

   // Show how to discover the index of each real character (honoring surrogates) in a string.
   static void EnumTextElementIndexes(String s) {
      // This StringBuilder holds the output results.
      StringBuilder sb = new StringBuilder();

      // Use the ParseCombiningCharacters method to 
      // get the index of each real character in the string.
      Int32[] textElemIndex = StringInfo.ParseCombiningCharacters(s);

      // Iterate through each real character showing the character and the index where it was found.
      for (Int32 i = 0; i < textElemIndex.Length; i++) {
         sb.AppendFormat(
            "Character {0} starts at index {1}{2}",
            i, textElemIndex[i], Environment.NewLine);
      }

      // Show the results.
      Console.WriteLine("Result of ParseCombiningCharacters:");
      Console.WriteLine(sb);
   }
}

// This code produces the following output.
//
// Result of GetTextElementEnumerator:
// Character at index 0 is 'a-"'
// Character at index 3 is 'b'
// Character at index 4 is 'c,'
// 
// Result of ParseCombiningCharacters:
// Character 0 starts at index 0
// Character 1 starts at index 3
// Character 2 starts at index 4
Imports System.Text
Imports System.Globalization

Public Module Example
   Public Sub Main()
      ' The string below contains combining characters.
      Dim s As String = "a" + ChrW(&h0304) + ChrW(&h0308) + "bc" + ChrW(&h0327)

      ' Show each 'character' in the string.
      EnumTextElements(s)

      ' Show the index in the string where each 'character' starts.
      EnumTextElementIndexes(s)
   End Sub

   ' Show how to enumerate each real character (honoring surrogates) in a string.
   Sub EnumTextElements(s As String)
      ' This StringBuilder holds the output results.
      Dim sb As New StringBuilder()

      ' Use the enumerator returned from GetTextElementEnumerator 
      ' method to examine each real character.
      Dim charEnum As TextElementEnumerator = StringInfo.GetTextElementEnumerator(s)
      Do While charEnum.MoveNext()
         sb.AppendFormat("Character at index {0} is '{1}'{2}",
                         charEnum.ElementIndex, 
                         charEnum.GetTextElement(),
                         Environment.NewLine)
      Loop

      ' Show the results.
      Console.WriteLine("Result of GetTextElementEnumerator:")
      Console.WriteLine(sb)
   End Sub

   ' Show how to discover the index of each real character (honoring surrogates) in a string.
   Sub EnumTextElementIndexes(s As String)
      ' This StringBuilder holds the output results.
      Dim sb As New StringBuilder()

      ' Use the ParseCombiningCharacters method to 
      ' get the index of each real character in the string.
      Dim textElemIndex() As Integer = StringInfo.ParseCombiningCharacters(s)

      ' Iterate through each real character showing the character and the index where it was found.
      For i As Int32 = 0 To textElemIndex.Length - 1
         sb.AppendFormat("Character {0} starts at index {1}{2}",
                         i, textElemIndex(i), Environment.NewLine)
      Next

      ' Show the results.
      Console.WriteLine("Result of ParseCombiningCharacters:")
      Console.WriteLine(sb)
   End Sub
End Module
' The example displays the following output:
'       Result of GetTextElementEnumerator:
'       Character at index 0 is 'a-"'
'       Character at index 3 is 'b'
'       Character at index 4 is 'c,'
'       
'       Result of ParseCombiningCharacters:
'       Character 0 starts at index 0
'       Character 1 starts at index 3
'       Character 2 starts at index 4

Comentários

O .NET define um elemento de texto como uma unidade de texto que é exibido como um único caractere, ou seja, um grafemas..NET defines a text element as a unit of text that is displayed as a single character, that is, a grapheme. Um elemento de texto pode ser um caractere base, um par substituto ou um caractere de combinação sequência.A text element can be a base character, a surrogate pair, or a combining character sequence. O padrão Unicode define um par substituto como uma representação de caracteres codificado para um único caractere abstrato que consiste em uma sequência de duas unidades de código, em que a primeira unidade do par é um substituto alto e o segundo é uma baixa substituto.The Unicode Standard defines a surrogate pair as a coded character representation for a single abstract character that consists of a sequence of two code units, where the first unit of the pair is a high surrogate and the second is a low surrogate. O padrão Unicode define uma combinação sequência como uma combinação de um caractere base e um ou mais caracteres de combinação de caracteres.The Unicode Standard defines a combining character sequence as a combination of a base character and one or more combining characters. Um par substituto pode representar um caractere base ou um caractere de combinação.A surrogate pair can represent a base character or a combining character.

O StringInfo classe permite que você trabalhe com uma cadeia de caracteres como uma série de elementos textuais, em vez de um indivíduo Char objetos.The StringInfo class enables you to work with a string as a series of textual elements rather than individual Char objects.

Para instanciar um StringInfo objeto que representa uma cadeia de caracteres especificada, você pode fazer o seguinte:To instantiate a StringInfo object that represents a specified string, you can do either of the following:

Você pode trabalhar com os elementos de texto individual em uma cadeia de caracteres de duas maneiras:You can work with the individual text elements in a string in two ways:

O exemplo a seguir ilustra as duas maneiras de trabalhar com os elementos de texto em uma cadeia de caracteres.The following example illustrates both ways of working with the text elements in a string. Ele cria duas cadeias de caracteres:It creates two strings:

  • strCombining, que é uma cadeia de caracteres árabes que inclui três elementos de texto com vários Char objetos.strCombining, which is a string of Arabic characters that includes three text elements with multiple Char objects. O primeiro elemento de texto é o caractere base ALEF de LETRA árabe (U +-627) seguido por HAMZA árabe abaixo (U +-655) e árabe KASRA (U + 0650).The first text element is the base character ARABIC LETTER ALEF (U+-627) followed by ARABIC HAMZA BELOW (U+-655) and ARABIC KASRA (U+0650). O segundo elemento de texto é a LETRA HEH árabe (U + 0647) seguido por FATHA árabe (U +-64E).The second text element is ARABIC LETTER HEH (U+0647) followed by ARABIC FATHA (U+-64E). O terceiro elemento de texto é BEH de LETTTER árabe (U + 0628) seguido por Dammatan árabe forma (U + 064C).The third text element is ARABIC LETTTER BEH (U+0628) followed by ARABIC DAMMATAN (U+064C).

  • strSurrogates, que é uma cadeia de caracteres que inclui três pares substitutos: GREGO ACROPHONIC cinco TALENTOS (U + 10148) do plano multilíngue suplementar, U + 20026 do plano ideográfico suplementar e U + F1001 da área privada do usuário.strSurrogates, which is a string that includes three surrogate pairs: GREEK ACROPHONIC FIVE TALENTS (U+10148) from the Supplementary Multilingual Plane, U+20026 from the Supplementary Ideographic Plane, and U+F1001 from the private user area. A codificação UTF-16 de cada caractere é um par substituto que consiste em um substituto alto seguido por um substituto baixo.The UTF-16 encoding of each character is a surrogate pair that consists of a high surrogate followed by a low surrogate.

Cada cadeia de caracteres é analisada uma vez o ParseCombiningCharacters método e, em seguida, o GetTextElementEnumerator método.Each string is parsed once by the ParseCombiningCharacters method and then by the GetTextElementEnumerator method. Ambos os métodos corretamente analisar os elementos de texto em duas cadeias de caracteres e exibem os resultados da operação de análise.Both methods correctly parse the text elements in the two strings and display the results of the parsing operation.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      // The Unicode code points specify Arabic base characters and 
      // combining character sequences.
      string strCombining = "\u0627\u0655\u0650\u064A\u0647\u064E" +
                            "\u0627\u0628\u064C";

      // The Unicode code points specify private surrogate pairs.
      string strSurrogates = Char.ConvertFromUtf32(0x10148) +
                             Char.ConvertFromUtf32(0x20026) + "a" +
                             Char.ConvertFromUtf32(0xF1001);
      
      EnumerateTextElements(strCombining);
      EnumerateTextElements(strSurrogates);
   }

   public static void EnumerateTextElements(string str)
   {
      // Get the Enumerator.
      TextElementEnumerator teEnum = null;      

      // Parse the string using the ParseCombiningCharacters method.
      Console.WriteLine("\nParsing with ParseCombiningCharacters:");
      int[] teIndices = StringInfo.ParseCombiningCharacters(str);
      
      for (int i = 0; i < teIndices.Length; i++) {
         if (i < teIndices.Length - 1)
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               teIndices[i], teIndices[i + 1] - 1, 
               ShowHexValues(str.Substring(teIndices[i], teIndices[i + 1] - 
                             teIndices[i])));
         else
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               teIndices[i], str.Length - 1, 
               ShowHexValues(str.Substring(teIndices[i])));
      }
      Console.WriteLine();

      // Parse the string with the GetTextElementEnumerator method.
      Console.WriteLine("Parsing with TextElementEnumerator:");
      teEnum = StringInfo.GetTextElementEnumerator(str);

      int teCount = - 1;

      while (teEnum.MoveNext()) {
         // Displays the current element.
         // Both GetTextElement() and Current retrieve the current
         // text element. The latter returns it as an Object.
         teCount++;
         Console.WriteLine("Text Element {0} ({1}..{2})= {3}", teCount, 
            teEnum.ElementIndex, teEnum.ElementIndex + 
            teEnum.GetTextElement().Length - 1, ShowHexValues((string)(teEnum.Current)));
      }
   }
   
   private static string ShowHexValues(string s)
   {
      string hexString = "";
      foreach (var ch in s)
         hexString += String.Format("{0:X4} ", Convert.ToUInt16(ch));

      return hexString;
   }
}
// The example displays the following output:
//       Parsing with ParseCombiningCharacters:
//       Text Element 0 (0..2)= 0627 0655 0650
//       Text Element 1 (3..3)= 064A
//       Text Element 2 (4..5)= 0647 064E
//       Text Element 3 (6..6)= 0627
//       Text Element 4 (7..8)= 0628 064C
//       
//       Parsing with TextElementEnumerator:
//       Text Element 0 (0..2)= 0627 0655 0650
//       Text Element 1 (3..3)= 064A
//       Text Element 2 (4..5)= 0647 064E
//       Text Element 3 (6..6)= 0627
//       Text Element 4 (7..8)= 0628 064C
//       
//       Parsing with ParseCombiningCharacters:
//       Text Element 0 (0..1)= D800 DD48
//       Text Element 1 (2..3)= D840 DC26
//       Text Element 2 (4..4)= 0061
//       Text Element 3 (5..6)= DB84 DC01
//       
//       Parsing with TextElementEnumerator:
//       Text Element 0 (0..1)= D800 DD48
//       Text Element 1 (2..3)= D840 DC26
//       Text Element 2 (4..4)= 0061
//       Text Element 3 (5..6)= DB84 DC01
Imports System.Globalization

Public Module Example
   Public Sub Main()
      ' The Unicode code points specify Arabic base characters and 
      ' combining character sequences.
      Dim strCombining As String = ChrW(&H627) & ChrW(&h0655) + ChrW(&H650) & 
              ChrW(&H64A) & ChrW(&H647) & ChrW(&H64E) & ChrW(&H627) & 
              ChrW(&H628) & ChrW(&H64C)

      ' The Unicode code points specify private surrogate pairs.
      Dim strSurrogates As String = Char.ConvertFromUtf32(&h10148) +
                                    Char.ConvertFromUtf32(&h20026) + "a" +
                                    Char.ConvertFromUtf32(&hF1001)
      
      EnumerateTextElements(strCombining)
      EnumerateTextElements(strSurrogates)
   End Sub

   Public Sub EnumerateTextElements(str As String)
      ' Get the Enumerator.
      Dim teEnum As TextElementEnumerator = Nothing      

      ' Parse the string using the ParseCombiningCharacters method.
      Console.WriteLine()
      Console.WriteLine("Parsing with ParseCombiningCharacters:")
      Dim teIndices As Integer() = StringInfo.ParseCombiningCharacters(str)
      
      For i As Integer = 0 To teIndices.Length - 1
         If i < teIndices.Length - 1 Then
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               TEIndices(i), TEIndices((i + 1)) - 1, 
               ShowHexValues(str.Substring(TEIndices(i), TEIndices((i + 1)) - 
                             teIndices(i))))
         Else
            Console.WriteLine("Text Element {0} ({1}..{2})= {3}", i, 
               teIndices(i), str.Length - 1, 
               ShowHexValues(str.Substring(teIndices(i))))
         End If
      Next
      Console.WriteLine()

      ' Parse the string with the GetTextElementEnumerator method.
      Console.WriteLine("Parsing with TextElementEnumerator:")
      teEnum = StringInfo.GetTextElementEnumerator(str)

      Dim TECount As Integer = - 1

      While teEnum.MoveNext()
         ' Prints the current element.
         ' Both GetTextElement() and Current retrieve the current
         ' text element. The latter returns it as an Object.
         TECount += 1
         Console.WriteLine("Text Element {0} ({1}..{2})= {3}", teCount, 
            teEnum.ElementIndex, teEnum.ElementIndex + 
            teEnum.GetTextElement().Length - 1, ShowHexValues(CStr(teEnum.Current)))
      End While
   End Sub
   
   Private Function ShowHexValues(s As String) As String
      Dim hexString As String = ""
      For Each ch In s
         hexString += String.Format("{0:X4} ", Convert.ToUInt16(ch))
      Next
      Return hexString
   End Function
End Module
' The example displays the following output:
'       Parsing with ParseCombiningCharacters:
'       Text Element 0 (0..2)= 0627 0655 0650
'       Text Element 1 (3..3)= 064A
'       Text Element 2 (4..5)= 0647 064E
'       Text Element 3 (6..6)= 0627
'       Text Element 4 (7..8)= 0628 064C
'       
'       Parsing with TextElementEnumerator:
'       Text Element 0 (0..2)= 0627 0655 0650
'       Text Element 1 (3..3)= 064A
'       Text Element 2 (4..5)= 0647 064E
'       Text Element 3 (6..6)= 0627
'       Text Element 4 (7..8)= 0628 064C
'       
'       Parsing with ParseCombiningCharacters:
'       Text Element 0 (0..1)= D800 DD48
'       Text Element 1 (2..3)= D840 DC26
'       Text Element 2 (4..4)= 0061
'       Text Element 3 (5..6)= DB84 DC01
'       
'       Parsing with TextElementEnumerator:
'       Text Element 0 (0..1)= D800 DD48
'       Text Element 1 (2..3)= D840 DC26
'       Text Element 2 (4..4)= 0061
'       Text Element 3 (5..6)= DB84 DC01

Notas aos Chamadores

Internamente, os métodos do StringInfo classe chamar os métodos do CharUnicodeInfo classe para determinar as categorias de caracteres.Internally, the methods of the StringInfo class call the methods of the CharUnicodeInfo class to determine character categories. Começando com o .NET Framework 4.6.2, classificação de caractere se baseia padrão Unicode, versão 8.0.0.Starting with the .NET Framework 4.6.2, character classification is based on The Unicode Standard, Version 8.0.0. Para o .NET Framework 4 por meio do .NET Framework 4.6.1, ele se baseia padrão Unicode, versão 6.3.0.For the .NET Framework 4 through the .NET Framework 4.6.1, it is based on The Unicode Standard, Version 6.3.0. No .NET Core, ele se baseia padrão Unicode, versão 8.0.0.In .NET Core, it is based on The Unicode Standard, Version 8.0.0.

Construtores

StringInfo() StringInfo() StringInfo() StringInfo()

Inicializa uma nova instância da classe StringInfo.Initializes a new instance of the StringInfo class.

StringInfo(String) StringInfo(String) StringInfo(String) StringInfo(String)

Inicializa uma nova instância da classe StringInfo para uma cadeia de caracteres especificada.Initializes a new instance of the StringInfo class to a specified string.

Propriedades

LengthInTextElements LengthInTextElements LengthInTextElements LengthInTextElements

Obtém o número de elementos de texto no objeto StringInfo atual.Gets the number of text elements in the current StringInfo object.

String String String String

Obtém ou define o valor do objeto StringInfo atual.Gets or sets the value of the current StringInfo object.

Métodos

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Indica se o objeto StringInfo atual é igual a um objeto especificado.Indicates whether the current StringInfo object is equal to a specified object.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Calcula um código hash para o valor atual do objeto StringInfo.Calculates a hash code for the value of the current StringInfo object.

GetNextTextElement(String) GetNextTextElement(String) GetNextTextElement(String) GetNextTextElement(String)

Obtém o primeiro elemento de texto de uma cadeia de caracteres especificada.Gets the first text element in a specified string.

GetNextTextElement(String, Int32) GetNextTextElement(String, Int32) GetNextTextElement(String, Int32) GetNextTextElement(String, Int32)

Obtém o elemento de texto no índice especificado da cadeia de caracteres especificada.Gets the text element at the specified index of the specified string.

GetTextElementEnumerator(String) GetTextElementEnumerator(String) GetTextElementEnumerator(String) GetTextElementEnumerator(String)

Retorna um enumerador que itera pelos elementos de texto de toda a cadeia de caracteres.Returns an enumerator that iterates through the text elements of the entire string.

GetTextElementEnumerator(String, Int32) GetTextElementEnumerator(String, Int32) GetTextElementEnumerator(String, Int32) GetTextElementEnumerator(String, Int32)

Retorna um enumerador que itera por meio dos elementos de texto da cadeia de caracteres, começando no índice especificado.Returns an enumerator that iterates through the text elements of the string, starting at the specified index.

GetType() GetType() GetType() GetType()

Obtém o Type da instância atual.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Cria uma cópia superficial do Object atual.Creates a shallow copy of the current Object.

(Inherited from Object)
ParseCombiningCharacters(String) ParseCombiningCharacters(String) ParseCombiningCharacters(String) ParseCombiningCharacters(String)

Retorna os índices de cada caractere base, substituto alto ou caractere de controle dentro da cadeia de caracteres especificada.Returns the indexes of each base character, high surrogate, or control character within the specified string.

SubstringByTextElements(Int32) SubstringByTextElements(Int32) SubstringByTextElements(Int32) SubstringByTextElements(Int32)

Recupera uma subcadeia de caracteres dos elementos de texto objeto StringInfo atual começando em um elemento de texto especificado e continuando até o último elemento de texto.Retrieves a substring of text elements from the current StringInfo object starting from a specified text element and continuing through the last text element.

SubstringByTextElements(Int32, Int32) SubstringByTextElements(Int32, Int32) SubstringByTextElements(Int32, Int32) SubstringByTextElements(Int32, Int32)

Recupera uma subcadeia de caracteres dos elementos de texto objeto StringInfo atual começando em um elemento de texto especificado e continuando pelo número de elementos de texto especificado.Retrieves a substring of text elements from the current StringInfo object starting from a specified text element and continuing through the specified number of text elements.

ToString() ToString() ToString() ToString()

Retorna uma cadeia de caracteres que representa o objeto atual.Returns a string that represents the current object.

(Inherited from Object)

Aplica-se a

Veja também