StringInfo StringInfo StringInfo StringInfo Class

Definición

Proporciona funciones para dividir una cadena en elementos de texto y procesar en iteración en dichos elementos.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
Herencia
StringInfoStringInfoStringInfoStringInfo
Atributos

Ejemplos

En este ejemplo se GetTextElementEnumerator utilizan ParseCombiningCharacters los métodos y StringInfo de la clase para manipular una cadena que contiene caracteres suplentes y de combinación.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

Comentarios

.NET define un elemento de texto como una unidad de texto que se muestra como un único carácter, es decir, un grapheme..NET defines a text element as a unit of text that is displayed as a single character, that is, a grapheme. Un elemento de texto puede ser un carácter base, un par suplente o una secuencia de caracteres combinable.A text element can be a base character, a surrogate pair, or a combining character sequence. El estándar Unicode define un par suplente como una representación de caracteres codificados para un único carácter abstracto que consta de una secuencia de dos unidades de código, donde la primera unidad del par es un suplente alto y la segunda es un suplente bajo.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. El estándar Unicode define una secuencia de caracteres de combinación como una combinación de un carácter base y uno o más caracteres combinados.The Unicode Standard defines a combining character sequence as a combination of a base character and one or more combining characters. Un par suplente puede representar un carácter base o un carácter de combinación.A surrogate pair can represent a base character or a combining character.

La StringInfo clase permite trabajar con una cadena como una serie de elementos de texto en lugar de objetos Char individuales.The StringInfo class enables you to work with a string as a series of textual elements rather than individual Char objects.

Para crear una instancia StringInfo de un objeto que representa una cadena especificada, puede realizar una de las acciones siguientes:To instantiate a StringInfo object that represents a specified string, you can do either of the following:

Puede trabajar con los elementos de texto individuales de una cadena de dos maneras:You can work with the individual text elements in a string in two ways:

En el ejemplo siguiente se muestran las distintas formas de trabajar con los elementos de texto en una cadena.The following example illustrates both ways of working with the text elements in a string. Crea dos cadenas:It creates two strings:

  • strCombining, que es una cadena de caracteres árabes que incluye tres elementos de texto con Char varios objetos.strCombining, which is a string of Arabic characters that includes three text elements with multiple Char objects. El primer elemento de texto es el carácter de base Letra árabe ALEF (U +-627) seguido de HAMZA árabe a continuación (U +-655) y KASRA de Árabe (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). El segundo elemento de texto es la letra árabe HEH (U + 0647) seguida por el FATHa árabe (U +-64E).The second text element is ARABIC LETTER HEH (U+0647) followed by ARABIC FATHA (U+-64E). El tercer elemento de texto es árabe LETTTER BEH (U + 0628) seguido de DAMMATAN árabe (U + 064C).The third text element is ARABIC LETTTER BEH (U+0628) followed by ARABIC DAMMATAN (U+064C).

  • strSurrogates, que es una cadena que incluye tres pares suplentes: Griego ACROPHONIC cinco talentos (U + 10148) del plano multilingüe suplementario, U + 20026 del plano ideográfico suplementario y U + F1001 desde el área de usuario privado.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. La codificación UTF-16 de cada carácter es un par suplente que consta de un suplente alto seguido de un suplente bajo.The UTF-16 encoding of each character is a surrogate pair that consists of a high surrogate followed by a low surrogate.

Cada cadena se analiza una vez por el ParseCombiningCharacters método y, a continuación GetTextElementEnumerator , por el método.Each string is parsed once by the ParseCombiningCharacters method and then by the GetTextElementEnumerator method. Ambos métodos analizan correctamente los elementos de texto de las dos cadenas y muestran los resultados de la operación de análisis.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 a los autores de las llamadas

Internamente, los métodos de la StringInfo clase llaman a los métodos de CharUnicodeInfo la clase para determinar las categorías de caracteres.Internally, the methods of the StringInfo class call the methods of the CharUnicodeInfo class to determine character categories. A partir de la .NET Framework 4.6.2, la clasificación de caracteres se basa en el estándar Unicode, versión 8.0.0.Starting with the .NET Framework 4.6.2, character classification is based on The Unicode Standard, Version 8.0.0. En el .NET Framework 4 a través del .NET Framework 4.6.1, se basa en el estándar Unicode, versión 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. En .NET Core, se basa en el estándar Unicode, versión 8.0.0.In .NET Core, it is based on The Unicode Standard, Version 8.0.0.

Constructores

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

Inicializa una nueva instancia de la clase StringInfo.Initializes a new instance of the StringInfo class.

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

Inicializa una nueva instancia de la clase StringInfo en una cadena especificada.Initializes a new instance of the StringInfo class to a specified string.

Propiedades

LengthInTextElements LengthInTextElements LengthInTextElements LengthInTextElements

Obtiene el número de elementos de texto del objeto StringInfo actual.Gets the number of text elements in the current StringInfo object.

String String String String

Obtiene o establece el valor del objeto StringInfo actual.Gets or sets the value of the current StringInfo object.

Métodos

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

Indica si el objeto StringInfo actual es igual a un objeto especificado.Indicates whether the current StringInfo object is equal to a specified object.

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

Calcula un código hash para el valor del objeto StringInfo actual.Calculates a hash code for the value of the current StringInfo object.

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

Obtiene el primer elemento de texto de una cadena especificada.Gets the first text element in a specified string.

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

Obtiene el elemento de texto en el índice especificado de la cadena indicada.Gets the text element at the specified index of the specified string.

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

Devuelve un enumerador que recorre en iteración los elementos de toda la cadena.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)

Devuelve un enumerador que recorre en iteración los elementos de texto de la cadena, empezando en el índice especificado.Returns an enumerator that iterates through the text elements of the string, starting at the specified index.

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

Obtiene el Type de la instancia actual.Gets the Type of the current instance.

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

Crea una copia superficial del objeto Object actual.Creates a shallow copy of the current Object.

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

Devuelve los índices de todos los caracteres base, suplentes altos o caracteres de control de la cadena 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 una subcadena de elementos de texto del objeto StringInfo actual empezando en un elemento de texto especificado y continuando hasta el 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 una subcadena de elementos de texto del objeto StringInfo actual empezando en un elemento de texto especificado y continuando en el número especificado de elementos de texto.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()

Devuelve una cadena que representa el objeto actual.Returns a string that represents the current object.

(Inherited from Object)

Se aplica a

Consulte también: