String.Split String.Split String.Split String.Split Method

Definición

Devuelve una matriz de cadenas que contiene las subcadenas de esta instancia que están delimitadas por elementos de la matriz de cadenas o caracteres Unicode especificada.Returns a string array that contains the substrings in this instance that are delimited by elements of a specified string or Unicode character array.

Sobrecargas

Split(Char[], Int32, StringSplitOptions) Split(Char[], Int32, StringSplitOptions) Split(Char[], Int32, StringSplitOptions) Split(Char[], Int32, StringSplitOptions)

Divide una cadena en un número máximo de subcadenas en función de los caracteres de una matriz.Splits a string into a maximum number of substrings based on the characters in an array.

Split(Char, Int32, StringSplitOptions) Split(Char, Int32, StringSplitOptions) Split(Char, Int32, StringSplitOptions)
Split(String[], Int32, StringSplitOptions) Split(String[], Int32, StringSplitOptions) Split(String[], Int32, StringSplitOptions) Split(String[], Int32, StringSplitOptions)

Divide una cadena en un número máximo de subcadenas en función de las cadenas de una matriz.Splits a string into a maximum number of substrings based on the strings in an array. Puede especificar si las subcadenas incluyen elementos de matriz vacíos.You can specify whether the substrings include empty array elements.

Split(String[], StringSplitOptions) Split(String[], StringSplitOptions) Split(String[], StringSplitOptions) Split(String[], StringSplitOptions)

Divide una cadena en subcadenas en función de las cadenas de una matriz.Splits a string into substrings based on the strings in an array. Puede especificar si las subcadenas incluyen elementos de matriz vacíos.You can specify whether the substrings include empty array elements.

Split(String, Int32, StringSplitOptions) Split(String, Int32, StringSplitOptions) Split(String, Int32, StringSplitOptions)
Split(Char[], StringSplitOptions) Split(Char[], StringSplitOptions) Split(Char[], StringSplitOptions) Split(Char[], StringSplitOptions)

Divide una cadena en subcadenas en función de los caracteres de una matriz.Splits a string into substrings based on the characters in an array. Puede especificar si las subcadenas incluyen elementos de matriz vacíos.You can specify whether the substrings include empty array elements.

Split(Char[], Int32) Split(Char[], Int32) Split(Char[], Int32) Split(Char[], Int32)

Divide una cadena en un número máximo de subcadenas en función de los caracteres de una matriz.Splits a string into a maximum number of substrings based on the characters in an array. Número máximo de subcadenas que se va devolver.You also specify the maximum number of substrings to return.

Split(Char, StringSplitOptions) Split(Char, StringSplitOptions) Split(Char, StringSplitOptions)
Split(String, StringSplitOptions) Split(String, StringSplitOptions) Split(String, StringSplitOptions)
Split(Char[]) Split(Char[]) Split(Char[]) Split(Char[])

Divide una cadena en subcadenas basadas en los caracteres de una matriz.Splits a string into substrings that are based on the characters in an array.

Comentarios

Splitse utiliza para dividir una cadena delimitada en subcadenas.Split is used to break a delimited string into substrings. Puede usar una matriz de caracteres para especificar cero, uno o varios caracteres delimitadores (el Split(Char[]) método), o puede usar una matriz de caracteres para especificar cero, una o varias cadenas de delimitación.You can use either a character array to specify zero, one, or multiple delimiting characters (the Split(Char[]) method), or you can use a character array to specify zero, one, or multiple delimiting strings. Las sobrecargas del Split método permiten limitar el número de subcadenas devueltas por el método (el Split(Char[], Int32) método), para determinar si las cadenas vacías se incluyen en las subcadenas devueltas (los Split(Char[], StringSplitOptions) métodos y Split(String[], StringSplitOptions) , o para hacer ambos (los Split(Char[], Int32, StringSplitOptions) métodos Split(String[], Int32, StringSplitOptions) y).Overloads of the Split method allow you to limit the number of substrings returned by the method (the Split(Char[], Int32) method), to determine whether empty strings are included in the returned substrings (the Split(Char[], StringSplitOptions) and Split(String[], StringSplitOptions) methods, or to do both (the Split(Char[], Int32, StringSplitOptions) and Split(String[], Int32, StringSplitOptions) methods).

Nota

Los ejemplos de C# de este artículo se ejecutan en el ejecutor de código en línea y área de juegos de Try.NET.The C# examples in this article run in the Try.NET inline code runner and playground. Haga clic en el botón Ejecutar para ejecutar un ejemplo en una ventana interactiva.Select the Run button to run an example in an interactive window. Una vez que se ejecuta el código, puede modificar y ejecutar el código modificado si vuelve a hacer clic en Ejecutar.Once you execute the code, you can modify it and run the modified code by selecting Run again. El código modificado se ejecuta en la ventana interactiva o, si se produce un error en la compilación, en la ventana interactiva se muestran todos los mensajes de error del compilador de C#.The modified code either runs in the interactive window or, if compilation fails, the interactive window displays all C# compiler error messages.

Alternativas a String. SplitAlternatives to String.Split

El Split método no es siempre la mejor manera de dividir una cadena delimitada en subcadenas.The Split method is not always the best way to break a delimited string into substrings. Si no desea extraer todas las subcadenas de una cadena delimitada, o si desea analizar una cadena en función de un patrón en lugar de un conjunto de caracteres delimitadores, tenga en cuenta las siguientes alternativas.If you don't want to extract all of the substrings of a delimited string, or if you want to parse a string based on a pattern instead of a set of delimiter characters, consider the following alternatives.

Expresiones regularesRegular expressions

Si las cadenas se ajustan a un patrón fijo, puede usar una expresión regular para extraer y controlar sus elementos.If your strings conform to a fixed pattern, you can use a regular expression to extract and handle their elements. Por ejemplo, si las cadenas tienen la forma "número de operando numérico " puede usar una expresión regular para extraer y controlar los elementos de la cadena.For example, if strings take the form "number operand number" you can use a regular expression to extract and handle the string's elements. Por ejemplo:Here's an example:

   String[] expressions = { "16 + 21", "31 * 3", "28 / 3",
                            "42 - 18", "12 * 7",
                            "2, 4, 6, 8" };
   String pattern = @"(\d+)\s+([-+*/])\s+(\d+)";
   foreach (var expression in expressions)
      foreach (System.Text.RegularExpressions.Match m in 
      System.Text.RegularExpressions.Regex.Matches(expression, pattern)) {
         int value1 = Int32.Parse(m.Groups[1].Value);
         int value2 = Int32.Parse(m.Groups[3].Value);
         switch (m.Groups[2].Value)
         {
            case "+":
               Console.WriteLine("{0} = {1}", m.Value, value1 + value2);
               break;
            case "-":
               Console.WriteLine("{0} = {1}", m.Value, value1 - value2);
               break;
            case "*":
               Console.WriteLine("{0} = {1}", m.Value, value1 * value2);
               break;
            case "/":
               Console.WriteLine("{0} = {1:N2}", m.Value, value1 / value2);
               break;
         }
      }
// The example displays the following output:
//       16 + 21 = 37
//       31 * 3 = 93
//       28 / 3 = 9.33
//       42 - 18 = 24
//       12 * 7 = 84
Imports System.Text.RegularExpressions

Module Example
   Public Sub Main()
      Dim expressions() As String = { "16 + 21", "31 * 3", "28 / 3",
                                      "42 - 18", "12 * 7",
                                      "2, 4, 6, 8" }

      Dim pattern As String = "(\d+)\s+([-+*/])\s+(\d+)"
      For Each expression In expressions
         For Each m As Match in Regex.Matches(expression, pattern)
            Dim value1 As Integer = Int32.Parse(m.Groups(1).Value)
            Dim value2 As Integer = Int32.Parse(m.Groups(3).Value)
            Select Case m.Groups(2).Value
               Case "+"
                  Console.WriteLine("{0} = {1}", m.Value, value1 + value2)
               Case "-"
                  Console.WriteLine("{0} = {1}", m.Value, value1 - value2)
               Case "*"
                  Console.WriteLine("{0} = {1}", m.Value, value1 * value2)
               Case "/"
                  Console.WriteLine("{0} = {1:N2}", m.Value, value1 / value2)
            End Select
         Next
      Next
   End Sub
End Module
' The example displays the following output:
'       16 + 21 = 37
'       31 * 3 = 93
'       28 / 3 = 9.33
'       42 - 18 = 24
'       12 * 7 = 84

El patrón (\d+)\s+([-+*/])\s+(\d+) de expresión regular se define de la siguiente manera:The regular expression pattern (\d+)\s+([-+*/])\s+(\d+) is defined like this:

ModeloPattern DescripciónDescription
(\d+) Buscar coincidencias con uno o más dígitos decimales.Match one or more decimal digits. Este es el primer grupo de captura.This is the first capturing group.
\s+ Coincide con uno o más caracteres de espacio en blanco.Match one or more white-space characters.
([-+*/]) Coincide con un signo de operador aritmético (+,-, * o/).Match an arithmetic operator sign (+, -, *, or /). Este es el segundo grupo de captura.This is the second capturing group.
\s+ Coincide con uno o más caracteres de espacio en blanco.Match one or more white-space characters.
(\d+) Buscar coincidencias con uno o más dígitos decimales.Match one or more decimal digits. Éste es el tercer grupo de captura.This is the third capturing group.

También puede usar una expresión regular para extraer subcadenas de una cadena basada en un patrón en lugar de un conjunto fijo de caracteres.You can also use a regular expression to extract substrings from a string based on a pattern rather than a fixed set of characters. Este es un escenario común cuando se produce cualquiera de estas condiciones:This is a common scenario when either of these conditions occurs:

  • Uno o más caracteres delimitadores no siempre sirven como delimitadores en la String instancia.One or more of the delimiter characters does not always serve as a delimiter in the String instance.

  • La secuencia y el número de caracteres delimitadores son variables o desconocidos.The sequence and number of delimiter characters is variable or unknown.

Por ejemplo, el Split método no se puede usar para dividir la cadena siguiente, porque el número \n de caracteres C#(en vbCrLf ) o (en Visual Basic) es variable, y no siempre sirven como delimitadores.For example, the Split method cannot be used to split the following string, because the number of \n (in C#) or vbCrLf (in Visual Basic) characters is variable, and they don't always serve as delimiters.

[This is captured\ntext.]\n\n[\n[This is more captured text.]\n]  
\n[Some more captured text:\n   Option1\n   Option2][Terse text.]  

Una expresión regular puede dividir fácilmente esta cadena, como se muestra en el ejemplo siguiente.A regular expression can split this string easily, as the following example shows.

String input = "[This is captured\ntext.]\n\n[\n" +
               "[This is more captured text.]\n]\n" +
               "[Some more captured text:\n   Option1" +
               "\n   Option2][Terse text.]";
String pattern = @"\[([^\[\]]+)\]";
int ctr = 0;
foreach (System.Text.RegularExpressions.Match m in 
   System.Text.RegularExpressions.Regex.Matches(input, pattern))
   Console.WriteLine("{0}: {1}", ++ctr, m.Groups[1].Value);
// The example displays the following output:
//       1: This is captured
//       text.
//       2: This is more captured text.
//       3: Some more captured text:
//          Option1
//          Option2
//       4: Terse text.
Imports System.Text.RegularExpressions

Module Example
   Public Sub Main()
      Dim input As String = String.Format("[This is captured{0}text.]" +
                                          "{0}{0}[{0}[This is more " +
                                          "captured text.]{0}{0}" +
                                          "[Some more captured text:" +
                                          "{0}   Option1" +
                                          "{0}   Option2][Terse text.]",
                                          vbCrLf)
      Dim pattern As String = "\[([^\[\]]+)\]"
      Dim ctr As Integer = 0
      For Each m As Match In Regex.Matches(input, pattern)
         ctr += 1
         Console.WriteLine("{0}: {1}", ctr, m.Groups(1).Value)
      Next
   End Sub
End Module
' The example displays the following output:
'       1: This is captured
'       text.
'       2: This is more captured text.
'       3: Some more captured text:
'          Option1
'          Option2
'       4: Terse text.

El patrón \[([^\[\]]+)\] de expresión regular se define de la siguiente manera:The regular expression pattern \[([^\[\]]+)\] is defined like this:

ModeloPattern DescripciónDescription
\[ Coincide con un corchete de apertura.Match an opening bracket.
([^\[\]]+) Buscar coincidencias con cualquier carácter que no sea un corchete de apertura o de cierre una o varias veces.Match any character that is not an opening or a closing bracket one or more times. Este es el primer grupo de captura.This is the first capturing group.
\] Coincide con un corchete de cierre.Match a closing bracket.

El Regex.Split método es casi idéntico a String.Split, salvo que divide una cadena basándose en un patrón de expresión regular en lugar de un juego de caracteres fijo.The Regex.Split method is almost identical to String.Split, except that it splits a string based on a regular expression pattern instead of a fixed character set. Por ejemplo, en el ejemplo siguiente se Regex.Split usa el método para dividir una cadena que contiene subcadenas delimitadas por varias combinaciones de guiones y otros caracteres.For example, the following example uses the Regex.Split method to split a string that contains substrings delimited by various combinations of hyphens and other characters.

String input = "abacus -- alabaster - * - atrium -+- " +
               "any -*- actual - + - armoire - - alarm";
String pattern = @"\s-\s?[+*]?\s?-\s";
String[] elements = System.Text.RegularExpressions.Regex.Split(input, pattern);
foreach (var element in elements)
   Console.WriteLine(element);

// The example displays the following output:
//       abacus
//       alabaster
//       atrium
//       any
//       actual
//       armoire
//       alarm
Imports System.Text.RegularExpressions

Module Example
   Public Sub Main()
      Dim input As String = "abacus -- alabaster - * - atrium -+- " +
                            "any -*- actual - + - armoir - - alarm"
      Dim pattern As String = "\s-\s?[+*]?\s?-\s"
      Dim elements() As String = Regex.Split(input, pattern)
      For Each element In elements
         Console.WriteLine(element)
      Next
   End Sub
End Module
' The example displays the following output:
'       abacus
'       alabaster
'       atrium
'       any
'       actual
'       armoir
'       alarm

El patrón \s-\s?[+*]?\s?-\s de expresión regular se define de la siguiente manera:The regular expression pattern \s-\s?[+*]?\s?-\s is defined like this:

ModeloPattern DescripciónDescription
\s- Coincide con un carácter de espacio en blanco seguido de un guión.Match a white-space character followed by a hyphen.
\s? Busca coincidencias con cero o un carácter de espacio en blanco.Match zero or one white-space character.
[+*]? Coincide con cero o una aparición del carácter + o *.Match zero or one occurrence of either the + or * character.
\s? Busca coincidencias con cero o un carácter de espacio en blanco.Match zero or one white-space character.
-\s Coincide con un guión seguido de un carácter de espacio en blanco.Match a hyphen followed by a white-space character.

Métodos de búsqueda y el método substringSearch methods and the Substring method

Si no está interesado en todas las subcadenas de una cadena, puede que prefiera trabajar con uno de los métodos de comparación de cadenas que devuelve el índice en el que comienza la coincidencia.If you aren't interested in all of the substrings in a string, you might prefer to work with one of the string comparison methods that returns the index at which the match begins. Después, puede llamar Substring al método para extraer la subcadena que desee.You can then call the Substring method to extract the substring that you want. Los métodos de comparación de cadenas incluyen:The string comparison methods include:

  • IndexOf, que devuelve el índice de base cero de la primera aparición de un carácter o cadena en una instancia de cadena.IndexOf, which returns the zero-based index of the first occurrence of a character or string in a string instance.

  • IndexOfAny, que devuelve el índice de base cero de la instancia de cadena actual de la primera aparición de cualquier carácter de una matriz de caracteres.IndexOfAny, which returns the zero-based index in the current string instance of the first occurrence of any character in a character array.

  • LastIndexOf, que devuelve el índice de base cero de la última aparición de un carácter o cadena en una instancia de cadena.LastIndexOf, which returns the zero-based index of the last occurrence of a character or string in a string instance.

  • LastIndexOfAny, que devuelve un índice basado en cero en la instancia de la cadena actual de la última aparición de cualquier carácter de una matriz de caracteres.LastIndexOfAny, which returns a zero-based index in the current string instance of the last occurrence of any character in a character array.

En el ejemplo siguiente se IndexOf usa el método para buscar los puntos de una cadena.The following example uses the IndexOf method to find the periods in a string. A continuación, usa Substring el método para devolver oraciones completas.It then uses the Substring method to return full sentences.

String value = "This is the first sentence in a string. " +
               "More sentences will follow. For example, " +
               "this is the third sentence. This is the " +
               "fourth. And this is the fifth and final " +
               "sentence.";
var sentences = new List<String>();
int position = 0;
int start = 0;
// Extract sentences from the string.
do 
{
   position = value.IndexOf('.', start);
   if (position >= 0) 
   {
      sentences.Add(value.Substring(start, position - start + 1).Trim());
      start = position + 1;
   }
} while (position > 0);

// Display the sentences.
foreach (var sentence in sentences)
   Console.WriteLine(sentence);

// The example displays the following output:
//       This is the first sentence in a string.
//       More sentences will follow.
//       For example, this is the third sentence.
//       This is the fourth.
//       And this is the fifth and final sentence.
Imports System.Collections.Generic

Module Example
   Public Sub Main()
      Dim value As String = "This is the first sentence in a string. " +
                            "More sentences will follow. For example, " +
                            "this is the third sentence. This is the " +
                            "fourth. And this is the fifth and final " +
                            "sentence."
      Dim sentences As New List(Of String)
      Dim position As Integer = 0
      Dim start As Integer = 0
      ' Extract sentences from the string.
      Do
         position = value.IndexOf("."c, start)
         If position >= 0 Then
            sentences.Add(value.Substring(start, position - start + 1).Trim())
            start = position + 1
         End If
      Loop While position > 0
      
      ' Display the sentences.
      For Each sentence In sentences
         Console.WriteLine(sentence)
      Next
   End Sub
End Module
' The example displays the following output:
'       This is the first sentence in a string.
'       More sentences will follow.
'       For example, this is the third sentence.
'       This is the fourth.
'       And this is the fifth and final sentence.

Split(Char[], Int32, StringSplitOptions) Split(Char[], Int32, StringSplitOptions) Split(Char[], Int32, StringSplitOptions) Split(Char[], Int32, StringSplitOptions)

Divide una cadena en un número máximo de subcadenas en función de los caracteres de una matriz.Splits a string into a maximum number of substrings based on the characters in an array.

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, int count, StringSplitOptions options);
[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (char[] separator, int count, StringSplitOptions options);
member this.Split : char[] * int * StringSplitOptions -> string[]
Public Function Split (separator As Char(), count As Integer, options As StringSplitOptions) As String()

Parámetros

separator
Char[]

Matriz de caracteres que delimitan las subcadenas de esta cadena, una matriz vacía sin delimitadores o null.A character array that delimits the substrings in this string, an empty array that contains no delimiters, or null.

count
Int32 Int32 Int32 Int32

Número máximo de subcadenas que se van devolver.The maximum number of substrings to return.

options
StringSplitOptions StringSplitOptions StringSplitOptions StringSplitOptions

RemoveEmptyEntries para omitir los elementos de matriz vacíos de la matriz devuelta; o bien, None para incluir los elementos de matriz vacíos en la matriz devuelta.RemoveEmptyEntries to omit empty array elements from the array returned; or None to include empty array elements in the array returned.

Devoluciones

String[]

Una matriz cuyos elementos contienen las subcadenas de esta cadena que están delimitadas por uno o varios caracteres de separator.An array whose elements contain the substrings in this string that are delimited by one or more characters in separator. Para obtener más información, vea la sección Comentarios.For more information, see the Remarks section.

Excepciones

options no es uno de los valores de StringSplitOptions.options is not one of the StringSplitOptions values.

Ejemplos

En el ejemplo siguiente se StringSplitOptions usa la enumeración para incluir o excluir subcadenas generadas por el Split método.The following example uses the StringSplitOptions enumeration to include or exclude substrings generated by the Split method.

// This example demonstrates the String.Split(Char[], Boolean) and 
//                               String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
   Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
   System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ entry = safe_cast<String^>(myEnum->Current);
      Console::Write( "<{0}>", entry );
   }

   Console::Write( "{0}{0}", Environment::NewLine );
}

int main()
{
   String^ s = ",one,,,two,,,,,three,,";
   array<Char>^sep = gcnew array<Char>{
      ','
   };
   array<String^>^result;
   
   //
   Console::WriteLine( "The original string is \"{0}\".", s );
   Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
   Console::WriteLine();
   
   //
   Console::WriteLine( "Split the string and return all elements:" );
   result = s->Split( sep, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return all non-empty elements:" );
   result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 elements:" );
   result = s->Split( sep, 2, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 non-empty elements:" );
   result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
}

/*
This example produces the following results:

The original string is ",one,,,two,,,,,three,,".
The separation character is ','.

Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>

Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>

Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>

Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>

*/
// This example demonstrates the String() methods that use
// the StringSplitOptions enumeration.
string s1 = ",ONE,,TWO,,,THREE,,";
string s2 = "[stop]" +
            "ONE[stop][stop]" +
            "TWO[stop][stop][stop]" +
            "THREE[stop][stop]";
char[] charSeparators = new char[] {','};
string[] stringSeparators = new string[] {"[stop]"};
string[] result;
// ------------------------------------------------------------------------------
// Split a string delimited by characters.
// ------------------------------------------------------------------------------
Console.WriteLine("1) Split a string delimited by characters:\n");

// Display the original string and delimiter characters.
Console.WriteLine("1a )The original string is \"{0}\".", s1);
Console.WriteLine("The delimiter character is '{0}'.\n", 
                   charSeparators[0]);

// Split a string delimited by characters and return all elements.
Console.WriteLine("1b) Split a string delimited by characters and " +
                  "return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split a string delimited by characters and return all non-empty elements.
Console.WriteLine("1c) Split a string delimited by characters and " +
                  "return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the original string into the string and empty string before the 
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("1d) Split a string delimited by characters and " +
                  "return 2 elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
Console.WriteLine("1e) Split a string delimited by characters and " +
                  "return 2 non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// ------------------------------------------------------------------------------
// Split a string delimited by another string.
// ------------------------------------------------------------------------------
Console.WriteLine("2) Split a string delimited by another string:\n");

// Display the original string and delimiter string.
Console.WriteLine("2a) The original string is \"{0}\".", s2);
Console.WriteLine("The delimiter string is \"{0}\".\n", stringSeparators[0]);

// Split a string delimited by another string and return all elements.
Console.WriteLine("2b) Split a string delimited by another string and " +
                  "return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the original string at the delimiter and return all non-empty elements.
Console.WriteLine("2c) Split a string delimited by another string and " +
                  "return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the original string into the empty string before the 
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("2d) Split a string delimited by another string and " +
                  "return 2 elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
Console.WriteLine("2e) Split a string delimited by another string and " + 
                  "return 2 non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine("The return value contains these {0} elements:", entries.Length);
    foreach (string entry in entries)
    {
        Console.Write("<{0}>", entry);
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

1a )The original string is ",ONE,,TWO,,,THREE,,".
The delimiter character is ','.

1b) Split a string delimited by characters and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Split a string delimited by characters and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1d) Split a string delimited by characters and return 2 elements:
The return value contains these 2 elements:
<><ONE,,TWO,,,THREE,,>

1e) Split a string delimited by characters and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO,,,THREE,,>

2) Split a string delimited by another string:

2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
The delimiter string is "[stop]".

2b) Split a string delimited by another string and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Split a string delimited by another string and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2d) Split a string delimited by another string and return 2 elements:
The return value contains these 2 elements:
<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>

2e) Split a string delimited by another string and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO[stop][stop][stop]THREE[stop][stop]>

*/

' This example demonstrates the String() methods that use
' the StringSplitOptions enumeration.
Class Sample
    Public Shared Sub Main() 
        Dim s1 As String = ",ONE,,TWO,,,THREE,,"
        Dim s2 As String = "[stop]" & _
                           "ONE[stop][stop]" & _
                           "TWO[stop][stop][stop]" & _
                           "THREE[stop][stop]"
        Dim charSeparators() As Char = {","c}
        Dim stringSeparators() As String = {"[stop]"}
        Dim result() As String
        ' ------------------------------------------------------------------------------
        ' Split a string delimited by characters.
        ' ------------------------------------------------------------------------------
        Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)
        
        ' Display the original string and delimiter characters.
        Console.WriteLine("1a )The original string is ""{0}"".", s1)
        Console.WriteLine("The delimiter character is '{0}'." & vbCrLf, charSeparators(0))
        
        ' Split a string delimited by characters and return all elements.
        Console.WriteLine("1b) Split a string delimited by characters and " & _
                          "return all elements:")
        result = s1.Split(charSeparators, StringSplitOptions.None)
        Show(result)
        
        ' Split a string delimited by characters and return all non-empty elements.
        Console.WriteLine("1c) Split a string delimited by characters and " & _
                          "return all non-empty elements:")
        result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' Split the original string into the string and empty string before the 
        ' delimiter and the remainder of the original string after the delimiter.
        Console.WriteLine("1d) Split a string delimited by characters and " & _
                          "return 2 elements:")
        result = s1.Split(charSeparators, 2, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string into the string after the delimiter and the 
        ' remainder of the original string after the delimiter.
        Console.WriteLine("1e) Split a string delimited by characters and " & _
                          "return 2 non-empty elements:")
        result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' ------------------------------------------------------------------------------
        ' Split a string delimited by another string.
        ' ------------------------------------------------------------------------------
        Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)
        
        ' Display the original string and delimiter string.
        Console.WriteLine("2a) The original string is ""{0}"".", s2)
        Console.WriteLine("The delimiter string is ""{0}""." & vbCrLf, stringSeparators(0))
        
        ' Split a string delimited by another string and return all elements.
        Console.WriteLine("2b) Split a string delimited by another string and " & _
                          "return all elements:")
        result = s2.Split(stringSeparators, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string at the delimiter and return all non-empty elements.
        Console.WriteLine("2c) Split a string delimited by another string and " & _
                          "return all non-empty elements:")
        result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' Split the original string into the empty string before the 
        ' delimiter and the remainder of the original string after the delimiter.
        Console.WriteLine("2d) Split a string delimited by another string and " & _
                          "return 2 elements:")
        result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string into the string after the delimiter and the 
        ' remainder of the original string after the delimiter.
        Console.WriteLine("2e) Split a string delimited by another string and " & _
                          "return 2 non-empty elements:")
        result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
    
    End Sub 'Main
    
    
    ' Display the array of separated strings.
    Public Shared Sub Show(ByVal entries() As String) 
        Console.WriteLine("The return value contains these {0} elements:", entries.Length)
        Dim entry As String
        For Each entry In  entries
            Console.Write("<{0}>", entry)
        Next entry
        Console.Write(vbCrLf & vbCrLf)
    
    End Sub 'Show
End Class 'Sample
'
'This example produces the following results:
'
'1) Split a string delimited by characters:
'
'1a )The original string is ",ONE,,TWO,,,THREE,,".
'The delimiter character is ','.
'
'1b) Split a string delimited by characters and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'1c) Split a string delimited by characters and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'1d) Split a string delimited by characters and return 2 elements:
'The return value contains these 2 elements:
'<><ONE,,TWO,,,THREE,,>
'
'1e) Split a string delimited by characters and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO,,,THREE,,>
'
'2) Split a string delimited by another string:
'
'2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
'The delimiter string is "[stop]".
'
'2b) Split a string delimited by another string and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'2c) Split a string delimited by another string and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'2d) Split a string delimited by another string and return 2 elements:
'The return value contains these 2 elements:
'<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>
'
'2e) Split a string delimited by another string and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO[stop][stop][stop]THREE[stop][stop]>
'

Comentarios

Los caracteres delimitadores no se incluyen en los elementos de la matriz devuelta.Delimiter characters are not included in the elements of the returned array.

Si esta instancia no contiene ninguno de los caracteres de separator, o el count parámetro es 1, la matriz devuelta consta de un único elemento que contiene esta instancia.If this instance does not contain any of the characters in separator, or the count parameter is 1, the returned array consists of a single element that contains this instance. Si el separator parámetro es null o no contiene caracteres, se supone que los caracteres de espacio en blanco son los delimitadores.If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. El estándar Unicode define los caracteres de espacio en blanco y devuelven true si se pasan Char.IsWhiteSpace al método.White-space characters are defined by the Unicode standard and return true if they are passed to the Char.IsWhiteSpace method. Sin embargo, si separator el parámetro de la llamada a esta sobrecarga del nullmétodo es, se produce un error en la resolución de sobrecarga del compilador.However, if the separator parameter in the call to this method overload is null, compiler overload resolution fails. Para identificar de forma inequívoca el método al que se llama, el código debe indicar el tipo del valor null.To unambiguously identify the called method, your code must indicate the type of the null. En el ejemplo siguiente se muestran varias maneras de identificar esta sobrecarga de forma inequívoca.The following example shows several ways to unambiguously identify this overload.

string phrase = "The quick  brown fox";
string[] words;

words = phrase.Split(default(Char[]), 3, StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split((char[]) null, 3, StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split(null as char[], 3, StringSplitOptions.RemoveEmptyEntries);
Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, Char()), 3, 
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New Char() {}, 3,
                     StringSplitOptions.RemoveEmptyEntries)

Si el count parámetro es cero, o el options parámetro es RemoveEmptyEntries y la longitud de esta instancia es cero, se devuelve una matriz vacía.If the count parameter is zero, or the options parameter is RemoveEmptyEntries and the length of this instance is zero, an empty array is returned.

Cada elemento de separator define un carácter delimitador independiente.Each element of separator defines a separate delimiter character. Si el options parámetro es None, y dos delimitadores son adyacentes o se encuentra un delimitador al principio o al final de esta instancia, el elemento de la Emptymatriz correspondiente contiene.If the options parameter is None, and two delimiters are adjacent or a delimiter is found at the beginning or end of this instance, the corresponding array element contains Empty.

Si hay más de count subcadenas en esta instancia, se devuelven las primeras count menos 1 subcadenas en los count primeros menos 1 elementos del valor devuelto, y el resto de los caracteres de esta instancia se devuelven en el último elemento del valor devuelto.If there are more than count substrings in this instance, the first count minus 1 substrings are returned in the first count minus 1 elements of the return value, and the remaining characters in this instance are returned in the last element of the return value.

Si count es mayor que el número de subcadenas, se devuelven las subcadenas disponibles y no se produce ninguna excepción.If count is greater than the number of substrings, the available substrings are returned and no exception is thrown.

Consideraciones sobre el rendimientoPerformance Considerations

Los Split métodos asignan memoria para el objeto de matriz devuelto y un String objeto para cada elemento de la matriz.The Split methods allocate memory for the returned array object and a String object for each array element. Si la aplicación requiere un rendimiento óptimo o si la administración de la asignación de memoria es fundamental en la IndexOf aplicación IndexOfAny , considere la posibilidad de usar Compare el método o y, opcionalmente, el método para buscar una subcadena en una cadena.If your application requires optimal performance or if managing memory allocation is critical in your application, consider using the IndexOf or IndexOfAny method, and optionally the Compare method, to locate a substring within a string.

Si está dividiendo una cadena en un carácter separador, utilice el IndexOf método IndexOfAny o para buscar un carácter separador en la cadena.If you are splitting a string at a separator character, use the IndexOf or IndexOfAny method to locate a separator character in the string. Si está dividiendo una cadena en una cadena separadora, use el IndexOf método IndexOfAny o para buscar el primer carácter de la cadena separadora.If you are splitting a string at a separator string, use the IndexOf or IndexOfAny method to locate the first character of the separator string. A continuación, Compare use el método para determinar si los caracteres situados después del primer carácter son iguales que los caracteres restantes de la cadena separadora.Then use the Compare method to determine whether the characters after that first character are equal to the remaining characters of the separator string.

Además, si se usa el mismo conjunto de caracteres para dividir cadenas en varias Split llamadas a métodos, considere la posibilidad de crear una sola matriz y hacer referencia a ella en cada llamada al método.In addition, if the same set of characters is used to split strings in multiple Split method calls, consider creating a single array and referencing it in each method call. Esto reduce significativamente la sobrecarga adicional de cada llamada al método.This significantly reduces the additional overhead of each method call.

Notas a los autores de las llamadas

Trim(Char[]) null separator Split(Char[]) En y versiones anteriores, si se pasa al método un que es o no contiene caracteres, el método usa un juego de caracteres ligeramente diferente para dividir la cadena de la que hace el método. .NET Framework 3,5.NET Framework 3.5 recorte la cadena.In the .NET Framework 3,5.NET Framework 3.5 and earlier versions, if the Split(Char[]) method is passed a separator that is null or contains no characters, the method uses a slightly different set of characters to split the string than the Trim(Char[]) method does to trim the string. A partir de la .NET Framework 4, ambos métodos usan un conjunto idéntico de caracteres de espacio en blanco Unicode.Starting with the .NET Framework 4, both methods use an identical set of Unicode white-space characters.

Split(Char, Int32, StringSplitOptions) Split(Char, Int32, StringSplitOptions) Split(Char, Int32, StringSplitOptions)

public string[] Split (char separator, int count, StringSplitOptions options = System.StringSplitOptions.None);
member this.Split : char * int * StringSplitOptions -> string[]
Public Function Split (separator As Char, count As Integer, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parámetros

separator
Char Char Char Char

Devoluciones

String[]

Split(String[], Int32, StringSplitOptions) Split(String[], Int32, StringSplitOptions) Split(String[], Int32, StringSplitOptions) Split(String[], Int32, StringSplitOptions)

Divide una cadena en un número máximo de subcadenas en función de las cadenas de una matriz.Splits a string into a maximum number of substrings based on the strings in an array. Puede especificar si las subcadenas incluyen elementos de matriz vacíos.You can specify whether the substrings include empty array elements.

public:
 cli::array <System::String ^> ^ Split(cli::array <System::String ^> ^ separator, int count, StringSplitOptions options);
[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (string[] separator, int count, StringSplitOptions options);
member this.Split : string[] * int * StringSplitOptions -> string[]
Public Function Split (separator As String(), count As Integer, options As StringSplitOptions) As String()

Parámetros

separator
String[]

Matriz de cadenas que delimitan las subcadenas de esta cadena, una matriz vacía sin delimitadores o null.A string array that delimits the substrings in this string, an empty array that contains no delimiters, or null.

count
Int32 Int32 Int32 Int32

Número máximo de subcadenas que se van devolver.The maximum number of substrings to return.

options
StringSplitOptions StringSplitOptions StringSplitOptions StringSplitOptions

RemoveEmptyEntries para omitir los elementos de matriz vacíos de la matriz devuelta; o bien, None para incluir los elementos de matriz vacíos en la matriz devuelta.RemoveEmptyEntries to omit empty array elements from the array returned; or None to include empty array elements in the array returned.

Devoluciones

String[]

Una matriz cuyos elementos contienen las subcadenas de esta cadena que están delimitadas por una o varias cadenas de separator.An array whose elements contain the substrings in this string that are delimited by one or more strings in separator. Para obtener más información, vea la sección Comentarios.For more information, see the Remarks section.

Excepciones

options no es uno de los valores de StringSplitOptions.options is not one of the StringSplitOptions values.

Ejemplos

En el ejemplo siguiente se StringSplitOptions usa la enumeración para incluir o excluir subcadenas generadas por el Split método.The following example uses the StringSplitOptions enumeration to include or exclude substrings generated by the Split method.

// This example demonstrates the String.Split(Char[], Boolean) and 
//                               String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
   Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
   System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ entry = safe_cast<String^>(myEnum->Current);
      Console::Write( "<{0}>", entry );
   }

   Console::Write( "{0}{0}", Environment::NewLine );
}

int main()
{
   String^ s = ",one,,,two,,,,,three,,";
   array<Char>^sep = gcnew array<Char>{
      ','
   };
   array<String^>^result;
   
   //
   Console::WriteLine( "The original string is \"{0}\".", s );
   Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
   Console::WriteLine();
   
   //
   Console::WriteLine( "Split the string and return all elements:" );
   result = s->Split( sep, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return all non-empty elements:" );
   result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 elements:" );
   result = s->Split( sep, 2, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 non-empty elements:" );
   result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
}

/*
This example produces the following results:

The original string is ",one,,,two,,,,,three,,".
The separation character is ','.

Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>

Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>

Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>

Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>

*/
// This example demonstrates the String() methods that use
// the StringSplitOptions enumeration.
string s1 = ",ONE,,TWO,,,THREE,,";
string s2 = "[stop]" +
            "ONE[stop][stop]" +
            "TWO[stop][stop][stop]" +
            "THREE[stop][stop]";
char[] charSeparators = new char[] {','};
string[] stringSeparators = new string[] {"[stop]"};
string[] result;
// ------------------------------------------------------------------------------
// Split a string delimited by characters.
// ------------------------------------------------------------------------------
Console.WriteLine("1) Split a string delimited by characters:\n");

// Display the original string and delimiter characters.
Console.WriteLine("1a )The original string is \"{0}\".", s1);
Console.WriteLine("The delimiter character is '{0}'.\n", 
                   charSeparators[0]);

// Split a string delimited by characters and return all elements.
Console.WriteLine("1b) Split a string delimited by characters and " +
                  "return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split a string delimited by characters and return all non-empty elements.
Console.WriteLine("1c) Split a string delimited by characters and " +
                  "return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the original string into the string and empty string before the 
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("1d) Split a string delimited by characters and " +
                  "return 2 elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
Console.WriteLine("1e) Split a string delimited by characters and " +
                  "return 2 non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// ------------------------------------------------------------------------------
// Split a string delimited by another string.
// ------------------------------------------------------------------------------
Console.WriteLine("2) Split a string delimited by another string:\n");

// Display the original string and delimiter string.
Console.WriteLine("2a) The original string is \"{0}\".", s2);
Console.WriteLine("The delimiter string is \"{0}\".\n", stringSeparators[0]);

// Split a string delimited by another string and return all elements.
Console.WriteLine("2b) Split a string delimited by another string and " +
                  "return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the original string at the delimiter and return all non-empty elements.
Console.WriteLine("2c) Split a string delimited by another string and " +
                  "return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the original string into the empty string before the 
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("2d) Split a string delimited by another string and " +
                  "return 2 elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
Console.WriteLine("2e) Split a string delimited by another string and " + 
                  "return 2 non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine("The return value contains these {0} elements:", entries.Length);
    foreach (string entry in entries)
    {
        Console.Write("<{0}>", entry);
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

1a )The original string is ",ONE,,TWO,,,THREE,,".
The delimiter character is ','.

1b) Split a string delimited by characters and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Split a string delimited by characters and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1d) Split a string delimited by characters and return 2 elements:
The return value contains these 2 elements:
<><ONE,,TWO,,,THREE,,>

1e) Split a string delimited by characters and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO,,,THREE,,>

2) Split a string delimited by another string:

2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
The delimiter string is "[stop]".

2b) Split a string delimited by another string and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Split a string delimited by another string and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2d) Split a string delimited by another string and return 2 elements:
The return value contains these 2 elements:
<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>

2e) Split a string delimited by another string and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO[stop][stop][stop]THREE[stop][stop]>

*/

' This example demonstrates the String() methods that use
' the StringSplitOptions enumeration.
Class Sample
    Public Shared Sub Main() 
        Dim s1 As String = ",ONE,,TWO,,,THREE,,"
        Dim s2 As String = "[stop]" & _
                           "ONE[stop][stop]" & _
                           "TWO[stop][stop][stop]" & _
                           "THREE[stop][stop]"
        Dim charSeparators() As Char = {","c}
        Dim stringSeparators() As String = {"[stop]"}
        Dim result() As String
        ' ------------------------------------------------------------------------------
        ' Split a string delimited by characters.
        ' ------------------------------------------------------------------------------
        Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)
        
        ' Display the original string and delimiter characters.
        Console.WriteLine("1a )The original string is ""{0}"".", s1)
        Console.WriteLine("The delimiter character is '{0}'." & vbCrLf, charSeparators(0))
        
        ' Split a string delimited by characters and return all elements.
        Console.WriteLine("1b) Split a string delimited by characters and " & _
                          "return all elements:")
        result = s1.Split(charSeparators, StringSplitOptions.None)
        Show(result)
        
        ' Split a string delimited by characters and return all non-empty elements.
        Console.WriteLine("1c) Split a string delimited by characters and " & _
                          "return all non-empty elements:")
        result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' Split the original string into the string and empty string before the 
        ' delimiter and the remainder of the original string after the delimiter.
        Console.WriteLine("1d) Split a string delimited by characters and " & _
                          "return 2 elements:")
        result = s1.Split(charSeparators, 2, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string into the string after the delimiter and the 
        ' remainder of the original string after the delimiter.
        Console.WriteLine("1e) Split a string delimited by characters and " & _
                          "return 2 non-empty elements:")
        result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' ------------------------------------------------------------------------------
        ' Split a string delimited by another string.
        ' ------------------------------------------------------------------------------
        Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)
        
        ' Display the original string and delimiter string.
        Console.WriteLine("2a) The original string is ""{0}"".", s2)
        Console.WriteLine("The delimiter string is ""{0}""." & vbCrLf, stringSeparators(0))
        
        ' Split a string delimited by another string and return all elements.
        Console.WriteLine("2b) Split a string delimited by another string and " & _
                          "return all elements:")
        result = s2.Split(stringSeparators, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string at the delimiter and return all non-empty elements.
        Console.WriteLine("2c) Split a string delimited by another string and " & _
                          "return all non-empty elements:")
        result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' Split the original string into the empty string before the 
        ' delimiter and the remainder of the original string after the delimiter.
        Console.WriteLine("2d) Split a string delimited by another string and " & _
                          "return 2 elements:")
        result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string into the string after the delimiter and the 
        ' remainder of the original string after the delimiter.
        Console.WriteLine("2e) Split a string delimited by another string and " & _
                          "return 2 non-empty elements:")
        result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
    
    End Sub 'Main
    
    
    ' Display the array of separated strings.
    Public Shared Sub Show(ByVal entries() As String) 
        Console.WriteLine("The return value contains these {0} elements:", entries.Length)
        Dim entry As String
        For Each entry In  entries
            Console.Write("<{0}>", entry)
        Next entry
        Console.Write(vbCrLf & vbCrLf)
    
    End Sub 'Show
End Class 'Sample
'
'This example produces the following results:
'
'1) Split a string delimited by characters:
'
'1a )The original string is ",ONE,,TWO,,,THREE,,".
'The delimiter character is ','.
'
'1b) Split a string delimited by characters and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'1c) Split a string delimited by characters and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'1d) Split a string delimited by characters and return 2 elements:
'The return value contains these 2 elements:
'<><ONE,,TWO,,,THREE,,>
'
'1e) Split a string delimited by characters and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO,,,THREE,,>
'
'2) Split a string delimited by another string:
'
'2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
'The delimiter string is "[stop]".
'
'2b) Split a string delimited by another string and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'2c) Split a string delimited by another string and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'2d) Split a string delimited by another string and return 2 elements:
'The return value contains these 2 elements:
'<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>
'
'2e) Split a string delimited by another string and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO[stop][stop][stop]THREE[stop][stop]>
'

Comentarios

Detalles del valor devueltoReturn value details

Las cadenas de delimitador no se incluyen en los elementos de la matriz devuelta.Delimiter strings are not included in the elements of the returned array.

Si esta instancia no contiene ninguna de las cadenas de separator, o el count parámetro es 1, la matriz devuelta consta de un único elemento que contiene esta instancia.If this instance does not contain any of the strings in separator, or the count parameter is 1, the returned array consists of a single element that contains this instance. Si el separator parámetro es null o no contiene caracteres, se supone que los caracteres de espacio en blanco son los delimitadores.If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. El estándar Unicode define los caracteres de espacio en blanco y devuelven true si se pasan Char.IsWhiteSpace al método.White-space characters are defined by the Unicode standard and return true if they are passed to the Char.IsWhiteSpace method. Sin embargo, si separator el parámetro de la llamada a esta sobrecarga del nullmétodo es, se produce un error en la resolución de sobrecarga del compilador.However, if the separator parameter in the call to this method overload is null, compiler overload resolution fails. Para identificar de forma inequívoca el método al que se llama, el código debe indicar nullel tipo de.To unambiguously identify the called method, your code must indicate the type of the null. En el ejemplo siguiente se muestran varias maneras de identificar esta sobrecarga de forma inequívoca.The following example shows several ways to unambiguously identify this overload.

string phrase = "The quick  brown fox";
string[] words;

words = phrase.Split(default(string[]), 3, StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split((string[]) null, 3, StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split(null as string[], 3, StringSplitOptions.RemoveEmptyEntries);
Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, String()), 3, 
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New String() {}, 3,
                     StringSplitOptions.RemoveEmptyEntries)

Si el count parámetro es cero, o el options parámetro es RemoveEmptyEntries y la longitud de esta instancia es cero, se devuelve una matriz vacía.If the count parameter is zero, or the options parameter is RemoveEmptyEntries and the length of this instance is zero, an empty array is returned.

Cada elemento de separator define un delimitador independiente que consta de uno o más caracteres.Each element of separator defines a separate delimiter that consists of one or more characters. Si el options parámetro es None, y dos delimitadores son adyacentes o se encuentra un delimitador al principio o al final de esta instancia, el elemento de la Emptymatriz correspondiente contiene.If the options parameter is None, and two delimiters are adjacent or a delimiter is found at the beginning or end of this instance, the corresponding array element contains Empty.

Si hay más de count subcadenas en esta instancia, se devuelven las primeras count menos 1 subcadenas en los count primeros menos 1 elementos del valor devuelto, y el resto de los caracteres de esta instancia se devuelven en el último elemento del valor devuelto.If there are more than count substrings in this instance, the first count minus 1 substrings are returned in the first count minus 1 elements of the return value, and the remaining characters in this instance are returned in the last element of the return value.

Si count es mayor que el número de subcadenas, se devuelven las subcadenas disponibles y no se produce ninguna excepción.If count is greater than the number of substrings, the available substrings are returned and no exception is thrown.

La matriz de separadorThe separator array

Si alguno de los elementos de separator consta de varios caracteres, la subcadena completa se considera un delimitador.If any of the elements in separator consists of multiple characters, the entire substring is considered a delimiter. Por ejemplo, si uno de los elementos de separator es "10", se intenta dividir la cadena "This10is10a10string".For example, if one of the elements in separator is "10", attempting to split the string "This10is10a10string." devuelve esta matriz de cuatro elementos: {"this", "is", "a", "String".returns this four-element array: { "This", "is", "a", "string." }.}.

Detalles de comparaciónComparison details

El Split método extrae las subcadenas de esta cadena que están delimitadas por una o varias de las cadenas separator del parámetro, y devuelve esas subcadenas como elementos de una matriz.The Split method extracts the substrings in this string that are delimited by one or more of the strings in the separator parameter, and returns those substrings as elements of an array.

El Split método busca delimitadores realizando comparaciones mediante reglas de ordenación ordinal con distinción entre mayúsculas y minúsculas.The Split method looks for delimiters by performing comparisons using case-sensitive ordinal sort rules. Para obtener más información sobre las ordenaciones de palabras, cadenas y ordinales, vea la System.Globalization.CompareOptions enumeración.For more information about word, string, and ordinal sorts, see the System.Globalization.CompareOptions enumeration.

El Split método omite cualquier separator elemento cuyo valor sea null o una cadena vacía ("").The Split method ignores any element of separator whose value is null or the empty string ("").

Para evitar resultados ambiguos cuando las separator cadenas de tienen caracteres en común Split , el método pasa desde el principio hasta el final del valor de la instancia de y coincide con el primer elemento separator de que es igual a un delimitador en el repetición.To avoid ambiguous results when strings in separator have characters in common, the Split method proceeds from the beginning to the end of the value of the instance, and matches the first element in separator that is equal to a delimiter in the instance. El orden en que se encuentran las subcadenas en la instancia tiene prioridad sobre el orden de los separatorelementos de.The order in which substrings are encountered in the instance takes precedence over the order of elements in separator.

Por ejemplo, considere una instancia cuyo valor es "abcdef".For example, consider an instance whose value is "abcdef". Si el primer elemento de separator era "EF" y el segundo elemento era "bcde", el resultado de la operación de división sería "a" y "f".If the first element in separator was "ef" and the second element was "bcde", the result of the split operation would be "a" and "f". Esto se debe a que la subcadena de la instancia, "bcde", se encuentra y coincide con separator un elemento de antes de que se encuentre la subcadena "f".This is because the substring in the instance, "bcde", is encountered and matches an element in separator before the substring "f" is encountered.

Sin embargo, si el primer elemento separator de era "BCD" y el segundo elemento era "BC", el resultado de la operación de división sería "a" y "EF".However, if the first element of separator was "bcd" and the second element was "bc", the result of the split operation would be "a" and "ef". Esto se debe a que "BCD" es el primer delimitador de separator que coincide con un delimitador en la instancia.This is because "bcd" is the first delimiter in separator that matches a delimiter in the instance. Si se invirtió el orden de los separadores, por lo que el primer elemento era "BC" y el segundo elemento era "BCD", el resultado sería "a" y "def".If the order of the separators was reversed so the first element was "bc" and the second element was "bcd", the result would be "a" and "def".

Consideraciones sobre el rendimientoPerformance considerations

Los Split métodos asignan memoria para el objeto de matriz devuelto y un String objeto para cada elemento de la matriz.The Split methods allocate memory for the returned array object and a String object for each array element. Si la aplicación requiere un rendimiento óptimo o si la administración de la asignación de memoria es fundamental en la IndexOf aplicación IndexOfAny , considere la posibilidad de usar Compare el método o y, opcionalmente, el método para buscar una subcadena en una cadena.If your application requires optimal performance or if managing memory allocation is critical in your application, consider using the IndexOf or IndexOfAny method, and optionally the Compare method, to locate a substring within a string.

Si está dividiendo una cadena en un carácter separador, utilice el IndexOf método IndexOfAny o para buscar un carácter separador en la cadena.If you are splitting a string at a separator character, use the IndexOf or IndexOfAny method to locate a separator character in the string. Si está dividiendo una cadena en una cadena separadora, use el IndexOf método IndexOfAny o para buscar el primer carácter de la cadena separadora.If you are splitting a string at a separator string, use the IndexOf or IndexOfAny method to locate the first character of the separator string. A continuación, Compare use el método para determinar si los caracteres situados después del primer carácter son iguales que los caracteres restantes de la cadena separadora.Then use the Compare method to determine whether the characters after that first character are equal to the remaining characters of the separator string.

Además, si se usa el mismo conjunto de caracteres para dividir cadenas en varias Split llamadas a métodos, considere la posibilidad de crear una sola matriz y hacer referencia a ella en cada llamada al método.In addition, if the same set of characters is used to split strings in multiple Split method calls, consider creating a single array and referencing it in each method call. Esto reduce significativamente la sobrecarga adicional de cada llamada al método.This significantly reduces the additional overhead of each method call.

Notas a los autores de las llamadas

Trim(Char[]) null separator Split(Char[]) En y versiones anteriores, si se pasa al método un que es o no contiene caracteres, el método usa un juego de caracteres ligeramente diferente para dividir la cadena de la que hace el método. .NET Framework 3,5.NET Framework 3.5 recorte la cadena.In the .NET Framework 3,5.NET Framework 3.5 and earlier versions, if the Split(Char[]) method is passed a separator that is null or contains no characters, the method uses a slightly different set of characters to split the string than the Trim(Char[]) method does to trim the string. A partir de la .NET Framework 4, ambos métodos usan un conjunto idéntico de caracteres de espacio en blanco Unicode.Starting with the .NET Framework 4, both methods use an identical set of Unicode white-space characters.

Split(String[], StringSplitOptions) Split(String[], StringSplitOptions) Split(String[], StringSplitOptions) Split(String[], StringSplitOptions)

Divide una cadena en subcadenas en función de las cadenas de una matriz.Splits a string into substrings based on the strings in an array. Puede especificar si las subcadenas incluyen elementos de matriz vacíos.You can specify whether the substrings include empty array elements.

public:
 cli::array <System::String ^> ^ Split(cli::array <System::String ^> ^ separator, StringSplitOptions options);
[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (string[] separator, StringSplitOptions options);
member this.Split : string[] * StringSplitOptions -> string[]
Public Function Split (separator As String(), options As StringSplitOptions) As String()

Parámetros

separator
String[]

Matriz de cadenas que delimitan las subcadenas de esta cadena, una matriz vacía sin delimitadores o null.A string array that delimits the substrings in this string, an empty array that contains no delimiters, or null.

options
StringSplitOptions StringSplitOptions StringSplitOptions StringSplitOptions

RemoveEmptyEntries para omitir los elementos de matriz vacíos de la matriz devuelta; o bien, None para incluir los elementos de matriz vacíos en la matriz devuelta.RemoveEmptyEntries to omit empty array elements from the array returned; or None to include empty array elements in the array returned.

Devoluciones

String[]

Una matriz cuyos elementos contienen las subcadenas de esta cadena que están delimitadas por una o varias cadenas de separator.An array whose elements contain the substrings in this string that are delimited by one or more strings in separator. Para obtener más información, vea la sección Comentarios.For more information, see the Remarks section.

Excepciones

options no es uno de los valores de StringSplitOptions.options is not one of the StringSplitOptions values.

Ejemplos

En el ejemplo siguiente se muestra la diferencia en las matrices devueltas llamando al método String.Split(String[], StringSplitOptions) de una cadena options con su parámetro StringSplitOptions.None igual StringSplitOptions.RemoveEmptyEntriesa y.The following example illustrates the difference in the arrays returned by calling a string's String.Split(String[], StringSplitOptions) method with its options parameter equal to StringSplitOptions.None and StringSplitOptions.RemoveEmptyEntries.

string source = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]";
string[] stringSeparators = new string[] {"[stop]"};
string[] result;

// Display the original string and delimiter string.
Console.WriteLine("Splitting the string:\n   \"{0}\".", source);
Console.WriteLine();
Console.WriteLine("Using the delimiter string:\n   \"{0}\"", 
                  stringSeparators[0]);
Console.WriteLine();                           
   
// Split a string delimited by another string and return all elements.
result = source.Split(stringSeparators, StringSplitOptions.None);
Console.WriteLine("Result including all elements ({0} elements):", 
                  result.Length);
Console.Write("   ");
foreach (string s in result)
{
   Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);                   
}
Console.WriteLine();
Console.WriteLine();

// Split delimited by another string and return all non-empty elements.
result = source.Split(stringSeparators, 
                      StringSplitOptions.RemoveEmptyEntries);
Console.WriteLine("Result including non-empty elements ({0} elements):", 
                  result.Length);
Console.Write("   ");
foreach (string s in result)
{
   Console.Write("'{0}' ", String.IsNullOrEmpty(s) ? "<>" : s);                   
}
Console.WriteLine();

// The example displays the following output:
//    Splitting the string:
//       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
//    
//    Using the delimiter string:
//       "[stop]"
//    
//    Result including all elements (9 elements):
//       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
//    
//    Result including non-empty elements (3 elements):
//       'ONE' 'TWO' 'THREE'
Module Example
   Public Sub Main()
      Dim source As String = "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]"
      Dim stringSeparators() As String = {"[stop]"}
      Dim result() As String
      
      ' Display the original string and delimiter string.
      Console.WriteLine("Splitting the string:{0}   '{1}'.", vbCrLf, source)
      Console.WriteLine()
      Console.WriteLine("Using the delimiter string:{0}   '{1}'.", _
                        vbCrLf, stringSeparators(0))
      Console.WriteLine()                          
         
      ' Split a string delimited by another string and return all elements.
      result = source.Split(stringSeparators, StringSplitOptions.None)
      Console.WriteLine("Result including all elements ({0} elements):", _ 
                        result.Length)
      Console.Write("   ")
      For Each s As String In result
         Console.Write("'{0}' ", IIf(String.IsNullOrEmpty(s), "<>", s))                   
      Next
      Console.WriteLine()
      Console.WriteLine()

      ' Split delimited by another string and return all non-empty elements.
      result = source.Split(stringSeparators, _ 
                            StringSplitOptions.RemoveEmptyEntries)
      Console.WriteLine("Result including non-empty elements ({0} elements):", _ 
                        result.Length)
      Console.Write("   ")
      For Each s As String In result
         Console.Write("'{0}' ", IIf(String.IsNullOrEmpty(s), "<>", s))                   
      Next
      Console.WriteLine()
   End Sub
End Module
' The example displays the following output:
'    Splitting the string:
'       "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
'    
'    Using the delimiter string:
'       "[stop]"
'    
'    Result including all elements (9 elements):
'       '<>' 'ONE' '<>' 'TWO' '<>' '<>' 'THREE' '<>' '<>'
'    
'    Result including non-empty elements (3 elements):
'       'ONE' 'TWO' 'THREE'

En el ejemplo siguiente se define una matriz de separadores que incluyen caracteres de puntuación y de espacio en blanco.The following example defines an array of separators that include punctuation and white-space characters. Pasar esta matriz junto con un valor de StringSplitOptions.RemoveEmptyEntries Split(String[], StringSplitOptions) al método devuelve una matriz que consta de las palabras individuales de la cadena.Passing this array along with a value of StringSplitOptions.RemoveEmptyEntries to the Split(String[], StringSplitOptions) method returns an array that consists of the individual words from the string.

string[] separators = {",", ".", "!", "?", ";", ":", " "};
string value = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate.";
string[] words = value.Split(separators, StringSplitOptions.RemoveEmptyEntries);
foreach (var word in words)
   Console.WriteLine(word);
   
// The example displays the following output:
//       The
//       handsome
//       energetic
//       young
//       dog
//       was
//       playing
//       with
//       his
//       smaller
//       more
//       lethargic
//       litter
//       mate
Module Example
   Public Sub Main()
      Dim separators() As String = {",", ".", "!", "?", ";", ":", " "}
      Dim value As String = "The handsome, energetic, young dog was playing with his smaller, more lethargic litter mate."
      Dim words() As String = value.Split(separators, StringSplitOptions.RemoveEmptyEntries)
      For Each word In words
         Console.WriteLine(word)
      Next   
   End Sub
End Module
' The example displays the following output:
'       The
'       handsome
'       energetic
'       young
'       dog
'       was
'       playing
'       with
'       his
'       smaller
'       more
'       lethargic
'       litter
'       mate

Tenga en cuenta que se llama al método options con el argumento StringSplitOptions.RemoveEmptyEntriesestablecido en.Note that the method is called with the options argument set to StringSplitOptions.RemoveEmptyEntries. Esto evita que la matriz devuelta String.Empty incluya valores que representan coincidencias de subcadena vacías entre signos de puntuación y caracteres de espacio en blanco.This prevents the returned array from including String.Empty values that represent empty substring matches between punctuation marks and white-space characters.

Comentarios

Cuando una cadena está delimitada por un conjunto de cadenas conocido, puede utilizar el Split método para separarlo en subcadenas.When a string is delimited by a known set of strings, you can use the Split method to separate it into substrings.

Detalles del valor devueltoReturn value details

Las cadenas de delimitador no se incluyen en los elementos de la matriz devuelta.Delimiter strings are not included in the elements of the returned array. Por ejemplo, si la separator matriz incluye la cadena "--" y el valor de la instancia de cadena actual es "AA--BB-CC", el método devuelve una matriz que contiene tres elementos: "AA", "BB" y "CC".For example, if the separator array includes the string "--" and the value of the current string instance is "aa--bb-cc", the method returns an array that contains three elements: "aa", "bb", and "cc".

Si esta instancia no contiene ninguna de las cadenas de separator, la matriz devuelta consta de un único elemento que contiene esta instancia.If this instance does not contain any of the strings in separator, the returned array consists of a single element that contains this instance.

Si el options parámetro es RemoveEmptyEntries y la longitud de esta instancia es cero, el método devuelve una matriz vacía.If the options parameter is RemoveEmptyEntries and the length of this instance is zero, the method returns an empty array.

Cada elemento de separator define un delimitador independiente que consta de uno o más caracteres.Each element of separator defines a separate delimiter that consists of one or more characters. Si el options argumento es None, y dos delimitadores son adyacentes o se encuentra un delimitador al principio o al final de esta instancia, el elemento de la String.Emptymatriz correspondiente contiene.If the options argument is None, and two delimiters are adjacent or a delimiter is found at the beginning or end of this instance, the corresponding array element contains String.Empty. Por ejemplo, si separator incluye dos elementos, "-" y "_", el valor de la instancia de cadena es "_-AA_ options -" y el valor del argumento es None, el método devuelve una matriz de cadena con los cinco elementos siguientes:For example, if separator includes two elements, "-" and "_", the value of the string instance is "-_aa-_", and the value of the options argument is None, the method returns a sting array with the following five elements:

  1. String.Empty, que representa la cadena vacía que precede a la subcadena "-" en el índice 0.String.Empty, which represents the empty string that precedes the "-" substring at index 0.

  2. String.Empty, que representa la cadena vacía entre la subcadena "-" en el índice 0 y la subcadena "" en el índice 1.String.Empty, which represents the empty string between the "-" substring at index 0 and the "" substring at index 1.

  3. "AA","aa",

  4. String.Empty, que representa la cadena vacía que sigue a la subcadena "" en el índice 4.String.Empty, which represents the empty string that follows the "" substring at index 4.

  5. String.Empty, que representa la cadena vacía que sigue a la subcadena "-" en el índice 5.String.Empty, which represents the empty string that follows the "-" substring at index 5.

La matriz de separadorThe separator array

Si alguno de los elementos de separator consta de varios caracteres, la subcadena completa se considera un delimitador.If any of the elements in separator consists of multiple characters, the entire substring is considered a delimiter. Por ejemplo, si uno de los elementos de separator es "10", se intenta dividir la cadena "This10is10a10string".For example, if one of the elements in separator is "10", attempting to split the string "This10is10a10string." Devuelve la siguiente matriz de cuatro elementos: {"this", "is", "a", "String".returns the following four-element array: { "This", "is", "a", "string." }.}.

Si el separator parámetro es null o no contiene caracteres, se supone que los caracteres de espacio en blanco son los delimitadores.If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. El estándar Unicode define los caracteres de espacio en blanco y devuelven true si se pasan Char.IsWhiteSpace al método.White-space characters are defined by the Unicode standard and return true if they are passed to the Char.IsWhiteSpace method.

Si el separator parámetro de la llamada a esta sobrecarga del método nulles, se produce un error en la resolución de sobrecarga del compilador.If the separator parameter in the call to this method overload is null, compiler overload resolution fails. Para identificar de forma inequívoca el método al que se llama, el código debe indicar nullel tipo de.To unambiguously identify the called method, your code must indicate the type of the null. En el ejemplo siguiente se muestran varias maneras de identificar esta sobrecarga de forma inequívoca.The following example shows several ways to unambiguously identify this overload.

string phrase = "The quick  brown fox";
string[] words;

words = phrase.Split(default(string[]), StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split((string[]) null, StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split(null as string[], StringSplitOptions.RemoveEmptyEntries);
Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, String()),  
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New String() {},
                     StringSplitOptions.RemoveEmptyEntries)

Detalles de comparaciónComparison details

El Split método extrae las subcadenas de esta cadena que están delimitadas por una o varias de las cadenas separator del parámetro, y devuelve esas subcadenas como elementos de una matriz.The Split method extracts the substrings in this string that are delimited by one or more of the strings in the separator parameter, and returns those substrings as elements of an array.

El Split método busca delimitadores realizando comparaciones mediante reglas de ordenación ordinal con distinción entre mayúsculas y minúsculas.The Split method looks for delimiters by performing comparisons using case-sensitive ordinal sort rules. Para obtener más información sobre las ordenaciones de palabras, cadenas y ordinales, vea la System.Globalization.CompareOptions enumeración.For more information about word, string, and ordinal sorts, see the System.Globalization.CompareOptions enumeration.

El Split método omite cualquier separator elemento cuyo valor sea null o una cadena vacía ("").The Split method ignores any element of separator whose value is null or the empty string ("").

Para evitar resultados ambiguos cuando las separator cadenas de tienen caracteres en común Split , la operación continúa desde el principio hasta el final del valor de la instancia y coincide con el primer elemento de separator que es igual a un delimitador en el repetición.To avoid ambiguous results when strings in separator have characters in common, the Split operation proceeds from the beginning to the end of the value of the instance, and matches the first element in separator that is equal to a delimiter in the instance. El orden en que se encuentran las subcadenas en la instancia tiene prioridad sobre el orden de los separatorelementos de.The order in which substrings are encountered in the instance takes precedence over the order of elements in separator.

Por ejemplo, considere una instancia cuyo valor es "abcdef".For example, consider an instance whose value is "abcdef". Si el primer elemento de separator era "EF" y el segundo elemento era "bcde", el resultado de la operación de división sería una matriz de cadenas que contiene dos elementos, "a" y "f".If the first element in separator was "ef" and the second element was "bcde", the result of the split operation would be a string array that contains two elements, "a" and "f". Esto se debe a que la subcadena de la instancia, "bcde", se encuentra y coincide con separator un elemento de antes de que se encuentre la subcadena "f".This is because the substring in the instance, "bcde", is encountered and matches an element in separator before the substring "f" is encountered.

Sin embargo, si el primer elemento separator de era "BCD" y el segundo elemento era "BC", el resultado de la operación de división sería una matriz de cadenas que contiene dos elementos, "a" y "EF".However, if the first element of separator was "bcd" and the second element was "bc", the result of the split operation would be a string array that contains two elements, "a" and "ef". Esto se debe a que "BCD" es el primer delimitador de separator que coincide con un delimitador en la instancia.This is because "bcd" is the first delimiter in separator that matches a delimiter in the instance. Si se revirtió el orden de los separadores, por lo que el primer elemento era "BC" y el segundo elemento era "BCD", el resultado sería una matriz de cadenas que contiene dos elementos, "a" y "def".If the order of the separators was reversed so the first element was "bc" and the second element was "bcd", the result would be a string array that contains two elements, "a" and "def".

Consideraciones sobre el rendimientoPerformance considerations

Los Split métodos asignan memoria para el objeto de matriz devuelto y un String objeto para cada elemento de la matriz.The Split methods allocate memory for the returned array object and a String object for each array element. Si la aplicación requiere un rendimiento óptimo o si la administración de la asignación de memoria es fundamental en la IndexOf aplicación IndexOfAny , considere la posibilidad de usar Compare el método o y, opcionalmente, el método para buscar una subcadena en una cadena.If your application requires optimal performance or if managing memory allocation is critical in your application, consider using the IndexOf or IndexOfAny method, and optionally the Compare method, to locate a substring within a string.

Si está dividiendo una cadena en un carácter separador, utilice el IndexOf método IndexOfAny o para buscar un carácter separador en la cadena.If you are splitting a string at a separator character, use the IndexOf or IndexOfAny method to locate a separator character in the string. Si está dividiendo una cadena en una cadena separadora, use el IndexOf método IndexOfAny o para buscar el primer carácter de la cadena separadora.If you are splitting a string at a separator string, use the IndexOf or IndexOfAny method to locate the first character of the separator string. A continuación, Compare use el método para determinar si los caracteres situados después del primer carácter son iguales que los caracteres restantes de la cadena separadora.Then use the Compare method to determine whether the characters after that first character are equal to the remaining characters of the separator string.

Además, si se usa el mismo conjunto de caracteres para dividir cadenas en varias Split llamadas a métodos, considere la posibilidad de crear una sola matriz y hacer referencia a ella en cada llamada al método.In addition, if the same set of characters is used to split strings in multiple Split method calls, consider creating a single array and referencing it in each method call. Esto reduce significativamente la sobrecarga adicional de cada llamada al método.This significantly reduces the additional overhead of each method call.

Notas a los autores de las llamadas

Trim(Char[]) null separator Split(Char[]) En y versiones anteriores, si se pasa al método un que es o no contiene caracteres, el método usa un juego de caracteres ligeramente diferente para dividir la cadena de la que hace el método. .NET Framework 3,5.NET Framework 3.5 recorte la cadena.In the .NET Framework 3,5.NET Framework 3.5 and earlier versions, if the Split(Char[]) method is passed a separator that is null or contains no characters, the method uses a slightly different set of characters to split the string than the Trim(Char[]) method does to trim the string. A partir de la .NET Framework 4, ambos métodos usan un conjunto idéntico de caracteres de espacio en blanco Unicode.Starting with the .NET Framework 4, both methods use an identical set of Unicode white-space characters.

Split(String, Int32, StringSplitOptions) Split(String, Int32, StringSplitOptions) Split(String, Int32, StringSplitOptions)

public string[] Split (string separator, int count, StringSplitOptions options = System.StringSplitOptions.None);
member this.Split : string * int * StringSplitOptions -> string[]
Public Function Split (separator As String, count As Integer, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parámetros

Devoluciones

String[]

Split(Char[], StringSplitOptions) Split(Char[], StringSplitOptions) Split(Char[], StringSplitOptions) Split(Char[], StringSplitOptions)

Divide una cadena en subcadenas en función de los caracteres de una matriz.Splits a string into substrings based on the characters in an array. Puede especificar si las subcadenas incluyen elementos de matriz vacíos.You can specify whether the substrings include empty array elements.

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, StringSplitOptions options);
[System.Runtime.InteropServices.ComVisible(false)]
public string[] Split (char[] separator, StringSplitOptions options);
member this.Split : char[] * StringSplitOptions -> string[]
Public Function Split (separator As Char(), options As StringSplitOptions) As String()

Parámetros

separator
Char[]

Matriz de caracteres que delimitan las subcadenas de esta cadena, una matriz vacía sin delimitadores o null.A character array that delimits the substrings in this string, an empty array that contains no delimiters, or null.

options
StringSplitOptions StringSplitOptions StringSplitOptions StringSplitOptions

RemoveEmptyEntries para omitir los elementos de matriz vacíos de la matriz devuelta; o bien, None para incluir los elementos de matriz vacíos en la matriz devuelta.RemoveEmptyEntries to omit empty array elements from the array returned; or None to include empty array elements in the array returned.

Devoluciones

String[]

Una matriz cuyos elementos contienen las subcadenas de esta cadena que están delimitadas por uno o varios caracteres de separator.An array whose elements contain the substrings in this string that are delimited by one or more characters in separator. Para obtener más información, vea la sección Comentarios.For more information, see the Remarks section.

Excepciones

options no es uno de los valores de StringSplitOptions.options is not one of the StringSplitOptions values.

Ejemplos

En el ejemplo siguiente se StringSplitOptions usa la enumeración para incluir o excluir subcadenas generadas por el Split método.The following example uses the StringSplitOptions enumeration to include or exclude substrings generated by the Split method.

// This example demonstrates the String.Split(Char[], Boolean) and 
//                               String.Split(Char[], Int32, Boolean) methods
using namespace System;
void Show( array<String^>^entries )
{
   Console::WriteLine( "The return value contains these {0} elements:", entries->Length );
   System::Collections::IEnumerator^ myEnum = entries->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ entry = safe_cast<String^>(myEnum->Current);
      Console::Write( "<{0}>", entry );
   }

   Console::Write( "{0}{0}", Environment::NewLine );
}

int main()
{
   String^ s = ",one,,,two,,,,,three,,";
   array<Char>^sep = gcnew array<Char>{
      ','
   };
   array<String^>^result;
   
   //
   Console::WriteLine( "The original string is \"{0}\".", s );
   Console::WriteLine( "The separation character is '{0}'.", sep[ 0 ] );
   Console::WriteLine();
   
   //
   Console::WriteLine( "Split the string and return all elements:" );
   result = s->Split( sep, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return all non-empty elements:" );
   result = s->Split( sep, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 elements:" );
   result = s->Split( sep, 2, StringSplitOptions::None );
   Show( result );
   
   //
   Console::WriteLine( "Split the string and return 2 non-empty elements:" );
   result = s->Split( sep, 2, StringSplitOptions::RemoveEmptyEntries );
   Show( result );
}

/*
This example produces the following results:

The original string is ",one,,,two,,,,,three,,".
The separation character is ','.

Split the string and return all elements:
The return value contains these 12 elements:
<><one><><><two><><><><><three><><>

Split the string and return all non-empty elements:
The return value contains these 3 elements:
<one><two><three>

Split the string and return 2 elements:
The return value contains these 2 elements:
<><one,,,two,,,,,three,,>

Split the string and return 2 non-empty elements:
The return value contains these 2 elements:
<one><,,two,,,,,three,,>

*/
// This example demonstrates the String() methods that use
// the StringSplitOptions enumeration.
string s1 = ",ONE,,TWO,,,THREE,,";
string s2 = "[stop]" +
            "ONE[stop][stop]" +
            "TWO[stop][stop][stop]" +
            "THREE[stop][stop]";
char[] charSeparators = new char[] {','};
string[] stringSeparators = new string[] {"[stop]"};
string[] result;
// ------------------------------------------------------------------------------
// Split a string delimited by characters.
// ------------------------------------------------------------------------------
Console.WriteLine("1) Split a string delimited by characters:\n");

// Display the original string and delimiter characters.
Console.WriteLine("1a )The original string is \"{0}\".", s1);
Console.WriteLine("The delimiter character is '{0}'.\n", 
                   charSeparators[0]);

// Split a string delimited by characters and return all elements.
Console.WriteLine("1b) Split a string delimited by characters and " +
                  "return all elements:");
result = s1.Split(charSeparators, StringSplitOptions.None);
Show(result);

// Split a string delimited by characters and return all non-empty elements.
Console.WriteLine("1c) Split a string delimited by characters and " +
                  "return all non-empty elements:");
result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the original string into the string and empty string before the 
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("1d) Split a string delimited by characters and " +
                  "return 2 elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
Console.WriteLine("1e) Split a string delimited by characters and " +
                  "return 2 non-empty elements:");
result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// ------------------------------------------------------------------------------
// Split a string delimited by another string.
// ------------------------------------------------------------------------------
Console.WriteLine("2) Split a string delimited by another string:\n");

// Display the original string and delimiter string.
Console.WriteLine("2a) The original string is \"{0}\".", s2);
Console.WriteLine("The delimiter string is \"{0}\".\n", stringSeparators[0]);

// Split a string delimited by another string and return all elements.
Console.WriteLine("2b) Split a string delimited by another string and " +
                  "return all elements:");
result = s2.Split(stringSeparators, StringSplitOptions.None);
Show(result);

// Split the original string at the delimiter and return all non-empty elements.
Console.WriteLine("2c) Split a string delimited by another string and " +
                  "return all non-empty elements:");
result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Split the original string into the empty string before the 
// delimiter and the remainder of the original string after the delimiter.
Console.WriteLine("2d) Split a string delimited by another string and " +
                  "return 2 elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.None);
Show(result);

// Split the original string into the string after the delimiter and the 
// remainder of the original string after the delimiter.
Console.WriteLine("2e) Split a string delimited by another string and " + 
                  "return 2 non-empty elements:");
result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries);
Show(result);

// Display the array of separated strings using a local function
void Show(string[] entries)
{
    Console.WriteLine("The return value contains these {0} elements:", entries.Length);
    foreach (string entry in entries)
    {
        Console.Write("<{0}>", entry);
    }
    Console.Write("\n\n");
}

/*
This example produces the following results:

1) Split a string delimited by characters:

1a )The original string is ",ONE,,TWO,,,THREE,,".
The delimiter character is ','.

1b) Split a string delimited by characters and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

1c) Split a string delimited by characters and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>

1d) Split a string delimited by characters and return 2 elements:
The return value contains these 2 elements:
<><ONE,,TWO,,,THREE,,>

1e) Split a string delimited by characters and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO,,,THREE,,>

2) Split a string delimited by another string:

2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
The delimiter string is "[stop]".

2b) Split a string delimited by another string and return all elements:
The return value contains these 9 elements:
<><ONE><><TWO><><><THREE><><>

2c) Split a string delimited by another string and return all non-empty elements:
The return value contains these 3 elements:
<ONE><TWO><THREE>

2d) Split a string delimited by another string and return 2 elements:
The return value contains these 2 elements:
<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>

2e) Split a string delimited by another string and return 2 non-empty elements:
The return value contains these 2 elements:
<ONE><TWO[stop][stop][stop]THREE[stop][stop]>

*/

' This example demonstrates the String() methods that use
' the StringSplitOptions enumeration.
Class Sample
    Public Shared Sub Main() 
        Dim s1 As String = ",ONE,,TWO,,,THREE,,"
        Dim s2 As String = "[stop]" & _
                           "ONE[stop][stop]" & _
                           "TWO[stop][stop][stop]" & _
                           "THREE[stop][stop]"
        Dim charSeparators() As Char = {","c}
        Dim stringSeparators() As String = {"[stop]"}
        Dim result() As String
        ' ------------------------------------------------------------------------------
        ' Split a string delimited by characters.
        ' ------------------------------------------------------------------------------
        Console.WriteLine("1) Split a string delimited by characters:" & vbCrLf)
        
        ' Display the original string and delimiter characters.
        Console.WriteLine("1a )The original string is ""{0}"".", s1)
        Console.WriteLine("The delimiter character is '{0}'." & vbCrLf, charSeparators(0))
        
        ' Split a string delimited by characters and return all elements.
        Console.WriteLine("1b) Split a string delimited by characters and " & _
                          "return all elements:")
        result = s1.Split(charSeparators, StringSplitOptions.None)
        Show(result)
        
        ' Split a string delimited by characters and return all non-empty elements.
        Console.WriteLine("1c) Split a string delimited by characters and " & _
                          "return all non-empty elements:")
        result = s1.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' Split the original string into the string and empty string before the 
        ' delimiter and the remainder of the original string after the delimiter.
        Console.WriteLine("1d) Split a string delimited by characters and " & _
                          "return 2 elements:")
        result = s1.Split(charSeparators, 2, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string into the string after the delimiter and the 
        ' remainder of the original string after the delimiter.
        Console.WriteLine("1e) Split a string delimited by characters and " & _
                          "return 2 non-empty elements:")
        result = s1.Split(charSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' ------------------------------------------------------------------------------
        ' Split a string delimited by another string.
        ' ------------------------------------------------------------------------------
        Console.WriteLine("2) Split a string delimited by another string:" & vbCrLf)
        
        ' Display the original string and delimiter string.
        Console.WriteLine("2a) The original string is ""{0}"".", s2)
        Console.WriteLine("The delimiter string is ""{0}""." & vbCrLf, stringSeparators(0))
        
        ' Split a string delimited by another string and return all elements.
        Console.WriteLine("2b) Split a string delimited by another string and " & _
                          "return all elements:")
        result = s2.Split(stringSeparators, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string at the delimiter and return all non-empty elements.
        Console.WriteLine("2c) Split a string delimited by another string and " & _
                          "return all non-empty elements:")
        result = s2.Split(stringSeparators, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
        
        ' Split the original string into the empty string before the 
        ' delimiter and the remainder of the original string after the delimiter.
        Console.WriteLine("2d) Split a string delimited by another string and " & _
                          "return 2 elements:")
        result = s2.Split(stringSeparators, 2, StringSplitOptions.None)
        Show(result)
        
        ' Split the original string into the string after the delimiter and the 
        ' remainder of the original string after the delimiter.
        Console.WriteLine("2e) Split a string delimited by another string and " & _
                          "return 2 non-empty elements:")
        result = s2.Split(stringSeparators, 2, StringSplitOptions.RemoveEmptyEntries)
        Show(result)
    
    End Sub 'Main
    
    
    ' Display the array of separated strings.
    Public Shared Sub Show(ByVal entries() As String) 
        Console.WriteLine("The return value contains these {0} elements:", entries.Length)
        Dim entry As String
        For Each entry In  entries
            Console.Write("<{0}>", entry)
        Next entry
        Console.Write(vbCrLf & vbCrLf)
    
    End Sub 'Show
End Class 'Sample
'
'This example produces the following results:
'
'1) Split a string delimited by characters:
'
'1a )The original string is ",ONE,,TWO,,,THREE,,".
'The delimiter character is ','.
'
'1b) Split a string delimited by characters and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'1c) Split a string delimited by characters and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'1d) Split a string delimited by characters and return 2 elements:
'The return value contains these 2 elements:
'<><ONE,,TWO,,,THREE,,>
'
'1e) Split a string delimited by characters and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO,,,THREE,,>
'
'2) Split a string delimited by another string:
'
'2a) The original string is "[stop]ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]".
'The delimiter string is "[stop]".
'
'2b) Split a string delimited by another string and return all elements:
'The return value contains these 9 elements:
'<><ONE><><TWO><><><THREE><><>
'
'2c) Split a string delimited by another string and return all non-empty elements:
'The return value contains these 3 elements:
'<ONE><TWO><THREE>
'
'2d) Split a string delimited by another string and return 2 elements:
'The return value contains these 2 elements:
'<><ONE[stop][stop]TWO[stop][stop][stop]THREE[stop][stop]>
'
'2e) Split a string delimited by another string and return 2 non-empty elements:
'The return value contains these 2 elements:
'<ONE><TWO[stop][stop][stop]THREE[stop][stop]>
'

Comentarios

Detalles del valor devueltoReturn value details

Los caracteres delimitadores (los caracteres de separator la matriz) no se incluyen en los elementos de la matriz devuelta.Delimiter characters (the characters in the separator array) are not included in the elements of the returned array. Por ejemplo, si la separator matriz incluye el carácter "-" y el valor de la instancia de la cadena actual es "AA-BB-CC", el método devuelve una matriz que contiene tres elementos: "AA", "BB" y "CC".For example, if the separator array includes the character "-" and the value of the current string instance is "aa-bb-cc", the method returns an array that contains three elements: "aa", "bb", and "cc".

Si esta instancia no contiene ninguno de los caracteres de separator, la matriz devuelta consta de un único elemento que contiene esta instancia.If this instance does not contain any of the characters in separator, the returned array consists of a single element that contains this instance.

Si el options parámetro es RemoveEmptyEntries y la longitud de esta instancia es cero, el método devuelve una matriz vacía.If the options parameter is RemoveEmptyEntries and the length of this instance is zero, the method returns an empty array.

Cada elemento de separator define un delimitador independiente que consta de un único carácter.Each element of separator defines a separate delimiter that consists of a single character. Si el options argumento es None, y dos delimitadores son adyacentes o se encuentra un delimitador al principio o al final de esta instancia, el elemento de la String.Emptymatriz correspondiente contiene.If the options argument is None, and two delimiters are adjacent or a delimiter is found at the beginning or end of this instance, the corresponding array element contains String.Empty. Por ejemplo, si separator incluye dos elementos, "-" y "_", el valor de la instancia de cadena es "_-AA_ options -" y el valor del argumento es None, el método devuelve una matriz de cadenas con los cinco elementos siguientes:For example, if separator includes two elements, "-" and "_", the value of the string instance is "-_aa-_", and the value of the options argument is None, the method returns a string array with the following five elements:

  1. String.Empty, que representa la cadena vacía que precede al carácter "-" en el índice 0.String.Empty, which represents the empty string that precedes the "-" character at index 0.

  2. String.Empty, que representa la cadena vacía entre el carácter "-" en el índice 0 y el carácter "" en el índice 1.String.Empty, which represents the empty string between the "-" character at index 0 and the "" character at index 1.

  3. "AA","aa",

  4. String.Empty, que representa la cadena vacía que sigue al carácter "" en el índice 4.String.Empty, which represents the empty string that follows the "" character at index 4.

  5. String.Empty, que representa la cadena vacía que sigue al carácter "-" en el índice 5.String.Empty, which represents the empty string that follows the "-" character at index 5.

La matriz de separadorThe separator array

Si el separator parámetro es null o no contiene caracteres, se supone que los caracteres de espacio en blanco son los delimitadores.If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. El estándar Unicode define los caracteres de espacio en blanco y devuelven true si se pasan Char.IsWhiteSpace al método.White-space characters are defined by the Unicode standard and return true if they are passed to the Char.IsWhiteSpace method.

Si el separator parámetro de la llamada a esta sobrecarga del método nulles, se produce un error en la resolución de sobrecarga del compilador.If the separator parameter in the call to this method overload is null, compiler overload resolution fails. Para identificar de forma inequívoca el método al que se llama, el código debe indicar nullel tipo de.To unambiguously identify the called method, your code must indicate the type of the null. En el ejemplo siguiente se muestran varias maneras de identificar esta sobrecarga de forma inequívoca.The following example shows several ways to unambiguously identify this overload.

string phrase = "The quick  brown fox";
string[] words;

words = phrase.Split(default(Char[]), StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split((char[]) null, StringSplitOptions.RemoveEmptyEntries);

words = phrase.Split(null as char[], StringSplitOptions.RemoveEmptyEntries);
Dim phrase As String = "The quick brown fox"
Dim words() As String

words = phrase.Split(TryCast(Nothing, Char()),  
                       StringSplitOptions.RemoveEmptyEntries)

words = phrase.Split(New Char() {}, 
                     StringSplitOptions.RemoveEmptyEntries)

Detalles de comparaciónComparison details

El Split método extrae las subcadenas de esta cadena que están delimitadas por uno o más de los caracteres separator del parámetro, y devuelve esas subcadenas como elementos de una matriz.The Split method extracts the substrings in this string that are delimited by one or more of the characters in the separator parameter, and returns those substrings as elements of an array.

El Split método busca delimitadores realizando comparaciones mediante reglas de ordenación ordinal con distinción entre mayúsculas y minúsculas.The Split method looks for delimiters by performing comparisons using case-sensitive ordinal sort rules. Para obtener más información sobre las ordenaciones de palabras, cadenas y ordinales, vea la System.Globalization.CompareOptions enumeración.For more information about word, string, and ordinal sorts, see the System.Globalization.CompareOptions enumeration.

Consideraciones sobre el rendimientoPerformance Considerations

Los Split métodos asignan memoria para el objeto de matriz devuelto y un String objeto para cada elemento de la matriz.The Split methods allocate memory for the returned array object and a String object for each array element. Si la aplicación requiere un rendimiento óptimo o si la administración de la asignación de memoria es fundamental en la IndexOf aplicación IndexOfAny , considere la posibilidad de usar Compare el método o y, opcionalmente, el método para buscar una subcadena en una cadena.If your application requires optimal performance or if managing memory allocation is critical in your application, consider using the IndexOf or IndexOfAny method, and optionally the Compare method, to locate a substring within a string.

Si está dividiendo una cadena en un carácter separador, utilice el IndexOf método IndexOfAny o para buscar un carácter separador en la cadena.If you are splitting a string at a separator character, use the IndexOf or IndexOfAny method to locate a separator character in the string. Si está dividiendo una cadena en una cadena separadora, use el IndexOf método IndexOfAny o para buscar el primer carácter de la cadena separadora.If you are splitting a string at a separator string, use the IndexOf or IndexOfAny method to locate the first character of the separator string. A continuación, Compare use el método para determinar si los caracteres situados después del primer carácter son iguales que los caracteres restantes de la cadena separadora.Then use the Compare method to determine whether the characters after that first character are equal to the remaining characters of the separator string.

Además, si se usa el mismo conjunto de caracteres para dividir cadenas en varias Split llamadas a métodos, considere la posibilidad de crear una sola matriz y hacer referencia a ella en cada llamada al método.In addition, if the same set of characters is used to split strings in multiple Split method calls, consider creating a single array and referencing it in each method call. Esto reduce significativamente la sobrecarga adicional de cada llamada al método.This significantly reduces the additional overhead of each method call.

Notas a los autores de las llamadas

Trim(Char[]) null separator Split(Char[]) En y versiones anteriores, si se pasa al método un que es o no contiene caracteres, el método usa un juego de caracteres ligeramente diferente para dividir la cadena de la que hace el método. .NET Framework 3,5.NET Framework 3.5 recorte la cadena.In the .NET Framework 3,5.NET Framework 3.5 and earlier versions, if the Split(Char[]) method is passed a separator that is null or contains no characters, the method uses a slightly different set of characters to split the string than the Trim(Char[]) method does to trim the string. A partir de la .NET Framework 4, ambos métodos usan un conjunto idéntico de caracteres de espacio en blanco Unicode.Starting with the .NET Framework 4, both methods use an identical set of Unicode white-space characters.

Split(Char[], Int32) Split(Char[], Int32) Split(Char[], Int32) Split(Char[], Int32)

Divide una cadena en un número máximo de subcadenas en función de los caracteres de una matriz.Splits a string into a maximum number of substrings based on the characters in an array. Número máximo de subcadenas que se va devolver.You also specify the maximum number of substrings to return.

public:
 cli::array <System::String ^> ^ Split(cli::array <char> ^ separator, int count);
public string[] Split (char[] separator, int count);
member this.Split : char[] * int -> string[]
Public Function Split (separator As Char(), count As Integer) As String()

Parámetros

separator
Char[]

Matriz de caracteres que delimitan las subcadenas de esta cadena, una matriz vacía sin delimitadores o null.A character array that delimits the substrings in this string, an empty array that contains no delimiters, or null.

count
Int32 Int32 Int32 Int32

Número máximo de subcadenas que se van devolver.The maximum number of substrings to return.

Devoluciones

String[]

Una matriz cuyos elementos contienen las subcadenas de esta instancia que están delimitadas por uno o varios caracteres de separator.An array whose elements contain the substrings in this instance that are delimited by one or more characters in separator. Para obtener más información, vea la sección Comentarios.For more information, see the Remarks section.

Excepciones

Ejemplos

En el ejemplo siguiente se count muestra cómo afecta al número de cadenas Splitdevueltas por.The following example demonstrates how count affects the number of strings returned by Split.

string delimStr = " ,.:";
char [] delimiter = delimStr.ToCharArray();
string words = "one two,three:four.";
string [] split = null;

Console.WriteLine("The delimiters are -{0}-", delimStr);
for (int x = 1; x <= 5; x++) 
{
   split = words.Split(delimiter, x);
   Console.WriteLine("\ncount = {0,2} ..............", x);
   foreach (var s in split) 
   {
       Console.WriteLine("-{0}-", s);
   }
}

// The example displays the following output:
//       The delimiters are - ,.:-
//       count =  1 ..............
//       -one two,three:four.-
//       count =  2 ..............
//       -one-
//       -two,three:four.-
//       count =  3 ..............
//       -one-
//       -two-
//       -three:four.-
//       count =  4 ..............
//       -one-
//       -two-
//       -three-
//       -four.-
//       count =  5 ..............
//       -one-
//       -two-
//       -three-
//       -four-
//       --
Public Class StringSplit2
   Public Shared Sub Main()
      
      Dim delimStr As String = " ,.:"
      Dim delimiter As Char() = delimStr.ToCharArray()
      Dim words As String = "one two,three:four."
      Dim split As String() = Nothing
      
      Console.WriteLine("The delimiters are -{0}-", delimStr)
      Dim x As Integer
      For x = 1 To 5
         split = words.Split(delimiter, x)
         Console.WriteLine(ControlChars.Cr + "count = {0,2} ..............", x)
         Dim s As String
         For Each s In  split
            Console.WriteLine("-{0}-", s)
         Next s
      Next x
   End Sub 
End Class 
' The example displays the following output:
'       The delimiters are - ,.:-
'       count =  1 ..............
'       -one two,three:four.-
'       count =  2 ..............
'       -one-
'       -two,three:four.-
'       count =  3 ..............
'       -one-
'       -two-
'       -three:four.-
'       count =  4 ..............
'       -one-
'       -two-
'       -three-
'       -four.-
'       count =  5 ..............
'       -one-
'       -two-
'       -three-
'       -four-
'       --

Comentarios

Los caracteres delimitadores no se incluyen en los elementos de la matriz devuelta.Delimiter characters are not included in the elements of the returned array.

Si esta instancia no contiene ninguno de los caracteres de separator, la matriz devuelta consta de un único elemento que contiene esta instancia.If this instance does not contain any of the characters in separator, the returned array consists of a single element that contains this instance. Si count es cero, se devuelve una matriz vacía.If count is zero, an empty array is returned.

Si el separator parámetro es null o no contiene caracteres, se supone que los caracteres de espacio en blanco son los delimitadores.If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. El estándar Unicode define los caracteres de espacio en blanco y devuelven true si se pasan Char.IsWhiteSpace al método.White-space characters are defined by the Unicode standard and return true if they are passed to the Char.IsWhiteSpace method.

Cada elemento de separator define un carácter delimitador independiente.Each element of separator defines a separate delimiter character. Si dos delimitadores son adyacentes, o se encuentra un delimitador al principio o al final de esta instancia, el elemento de la Emptymatriz correspondiente contiene.If two delimiters are adjacent, or a delimiter is found at the beginning or end of this instance, the corresponding array element contains Empty.

Si hay más de count subcadenas en esta instancia, se devuelven las primeras count menos 1 subcadenas en los count primeros menos 1 elementos del valor devuelto, y el resto de los caracteres de esta instancia se devuelven en el último elemento del valor devuelto.If there are more than count substrings in this instance, the first count minus 1 substrings are returned in the first count minus 1 elements of the return value, and the remaining characters in this instance are returned in the last element of the return value.

Si count es mayor que el número de subcadenas, se devuelven las subcadenas disponibles y no se produce ninguna excepción.If count is greater than the number of substrings, the available substrings are returned and no exception is thrown.

En la tabla siguiente se proporcionan ejemplos.The following table provides examples.

Valor de cadenaString value SeparadorSeparator RecuentoCount Matriz devueltaReturned array
"42, 12, 19""42, 12, 19" New Char [] {', ', ' '} (C#)new Char[] {',', ' '} (C#)

Char () = {"," c, "" c} (Visual Basic)Char() = {","c, " "c} (Visual Basic)
22 {"42", " 12, 19"}{"42", " 12, 19"}
"42..12..19""42..12..19" New Char [] {'. '}new Char[] {'.'} (C#)(C#)

Char () = {"." c} (Visual Basic)Char() = {"."c} (Visual Basic)
44 {"42", "", "12", ".19"}{"42", "", "12", ".19"}
Plátano"Banana" New Char [] {'. '}new Char[] {'.'} (C#)(C#)

Char () = {"." c} (Visual Basic)Char() = {"."c} (Visual Basic)
22 {"Banana"}{"Banana"}
"Darb\nSmarba" (C#)"Darb\nSmarba" (C#)

"Darb" & vbLf & "Smarba" (Visual Basic)"Darb" & vbLf & "Smarba" (Visual Basic)
New Char [] {} (C#)new Char[] {} (C#)

Char () = {} (Visual Basic)Char() = {} (Visual Basic)
11 {"Darb\nSmarba"} (C#){"Darb\nSmarba"} (C#)

"Darb" & vbLf & "Smarba" (Visual Basic)"Darb" & vbLf & "Smarba" (Visual Basic)
"Darb\nSmarba" (C#)"Darb\nSmarba" (C#)

"Darb" & vbLf & "Smarba" (Visual Basic)"Darb" & vbLf & "Smarba" (Visual Basic)
New Char [] null (C#)new Char[] null (C#)

Char () = NothingChar() = Nothing
22 {"Darb", "Smarba"}{"Darb", "Smarba"}
"Darb\nSmarba" (C#)"Darb\nSmarba" (C#)

"Darb" & vbLf & "Smarba" (Visual Basic)"Darb" & vbLf & "Smarba" (Visual Basic)
New Char [] null (C#)new Char[] null (C#)

Char () = NothingChar() = Nothing
100100 {"Darb", "Smarba"}{"Darb", "Smarba"}

Consideraciones sobre el rendimientoPerformance Considerations

Los Split métodos asignan memoria para el objeto de matriz devuelto y un String objeto para cada elemento de la matriz.The Split methods allocate memory for the returned array object and a String object for each array element. Si la aplicación requiere un rendimiento óptimo o si la administración de la asignación de memoria es fundamental en la IndexOf aplicación IndexOfAny , considere la posibilidad de usar Compare el método o y, opcionalmente, el método para buscar una subcadena en una cadena.If your application requires optimal performance or if managing memory allocation is critical in your application, consider using the IndexOf or IndexOfAny method, and optionally the Compare method, to locate a substring within a string.

Si está dividiendo una cadena en un carácter separador, utilice el IndexOf método IndexOfAny o para buscar un carácter separador en la cadena.If you are splitting a string at a separator character, use the IndexOf or IndexOfAny method to locate a separator character in the string. Si está dividiendo una cadena en una cadena separadora, use el IndexOf método IndexOfAny o para buscar el primer carácter de la cadena separadora.If you are splitting a string at a separator string, use the IndexOf or IndexOfAny method to locate the first character of the separator string. A continuación, Compare use el método para determinar si los caracteres situados después del primer carácter son iguales que los caracteres restantes de la cadena separadora.Then use the Compare method to determine whether the characters after that first character are equal to the remaining characters of the separator string.

Además, si se usa el mismo conjunto de caracteres para dividir cadenas en varias Split llamadas a métodos, considere la posibilidad de crear una sola matriz y hacer referencia a ella en cada llamada al método.In addition, if the same set of characters is used to split strings in multiple Split method calls, consider creating a single array and referencing it in each method call. Esto reduce significativamente la sobrecarga adicional de cada llamada al método.This significantly reduces the additional overhead of each method call.

Notas a los autores de las llamadas

Trim(Char[]) null separator Split(Char[]) En y versiones anteriores, si se pasa al método un que es o no contiene caracteres, el método usa un juego de caracteres ligeramente diferente para dividir la cadena de la que hace el método. .NET Framework 3,5.NET Framework 3.5 recorte la cadena.In the .NET Framework 3,5.NET Framework 3.5 and earlier versions, if the Split(Char[]) method is passed a separator that is null or contains no characters, the method uses a slightly different set of characters to split the string than the Trim(Char[]) method does to trim the string. A partir de la .NET Framework 4, ambos métodos usan un conjunto idéntico de caracteres de espacio en blanco Unicode.Starting with the .NET Framework 4, both methods use an identical set of Unicode white-space characters.

Consulte también:

Split(Char, StringSplitOptions) Split(Char, StringSplitOptions) Split(Char, StringSplitOptions)

public string[] Split (char separator, StringSplitOptions options = System.StringSplitOptions.None);
member this.Split : char * StringSplitOptions -> string[]
Public Function Split (separator As Char, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parámetros

separator
Char Char Char Char

Devoluciones

String[]

Split(String, StringSplitOptions) Split(String, StringSplitOptions) Split(String, StringSplitOptions)

public string[] Split (string separator, StringSplitOptions options = System.StringSplitOptions.None);
member this.Split : string * StringSplitOptions -> string[]
Public Function Split (separator As String, Optional options As StringSplitOptions = System.StringSplitOptions.None) As String()

Parámetros

Devoluciones

String[]

Split(Char[]) Split(Char[]) Split(Char[]) Split(Char[])

Divide una cadena en subcadenas basadas en los caracteres de una matriz.Splits a string into substrings that are based on the characters in an array.

public:
 cli::array <System::String ^> ^ Split(... cli::array <char> ^ separator);
public string[] Split (params char[] separator);
member this.Split : char[] -> string[]
Public Function Split (ParamArray separator As Char()) As String()

Parámetros

separator
Char[]

Matriz de caracteres que delimitan las subcadenas de esta cadena, una matriz vacía sin delimitadores o null.A character array that delimits the substrings in this string, an empty array that contains no delimiters, or null.

Devoluciones

String[]

Una matriz cuyos elementos contienen las subcadenas de esta instancia que están delimitadas por uno o varios caracteres de separator.An array whose elements contain the substrings from this instance that are delimited by one or more characters in separator. Para obtener más información, vea la sección Comentarios.For more information, see the Remarks section.

Ejemplos

En el ejemplo siguiente se muestra cómo extraer palabras individuales de un bloque de texto mediante el tratamiento de los signos de puntuación y los espacios en blanco como delimitadores.The following example demonstrates how to extract individual words from a block of text by treating white space and punctuation marks as delimiters. La matriz separator String.Split(Char[]) de caracteres que se pasa al parámetro del método consta de un carácter de espacio y un carácter de tabulación, junto con algunos símbolos de puntuación comunes.The character array passed to the separator parameter of the String.Split(Char[]) method consists of a space character and a tab character, together with some common punctuation symbols.

string words = "This is a list of words, with: a bit of punctuation" +
               "\tand a tab character.";

string [] split = words.Split(new Char [] {' ', ',', '.', ':', '\t' });

foreach (string s in split) 
{

    if (s.Trim() != "")
        Console.WriteLine(s);
}

// The example displays the following output to the console:
//       This
//       is
//       a
//       list
//       of
//       words
//       with
//       a
//       bit
//       of
//       punctuation
//       and
//       a
//       tab
//       character
Public Class SplitTest
    Public Shared Sub Main()
        Dim words As String = "This is a list of words, with: a bit of punctuation" + _
                              vbTab + "and a tab character."
        Dim split As String() = words.Split(New [Char]() {" "c, ","c, "."c, ":"c, CChar(vbTab) })
                
        For Each s As String In  split
            If s.Trim() <> "" Then
                Console.WriteLine(s)
            End If
        Next s
    End Sub 'Main
End Class 'SplitTest
' The example displays the following output to the console:
'       This
'       is
'       a
'       list
'       of
'       words
'       with
'       a
'       bit
'       of
'       punctuation
'       and
'       a
'       tab
'       character

Comentarios

Cuando una cadena está delimitada por un conjunto de caracteres conocido, puede utilizar el Split(Char[]) método para separarlo en subcadenas.When a string is delimited by a known set of characters, you can use the Split(Char[]) method to separate it into substrings.

Detalles del valor devueltoReturn value details

Los caracteres delimitadores no se incluyen en los elementos de la matriz devuelta.Delimiter characters are not included in the elements of the returned array. Por ejemplo, si la matriz de separador incluye el carácter "-" y el valor de la instancia de cadena actual es "AA-BB-CC", el método devuelve una matriz que contiene tres elementos: "AA", "BB" y "CC".For example, if the separator array includes the character "-" and the value of the current string instance is "aa-bb-cc", the method returns an array that contains three elements: "aa", "bb", and "cc".

Si esta instancia no contiene ninguno de los caracteres de separator, la matriz devuelta consta de un único elemento que contiene esta instancia.If this instance does not contain any of the characters in separator, the returned array consists of a single element that contains this instance.

Cada elemento de separator define un carácter delimitador independiente.Each element of separator defines a separate delimiter character. Si dos delimitadores son adyacentes, o se encuentra un delimitador al principio o al final de esta instancia, el elemento correspondiente de la matriz devuelta contiene Empty.If two delimiters are adjacent, or a delimiter is found at the beginning or end of this instance, the corresponding element in the returned array contains Empty. A continuación se muestran algunos ejemplos:Here are some examples:

Valor de cadenaString value SeparadorSeparator Matriz devueltaReturned array
"42, 12, 19""42, 12, 19" New Char [] {', ', ' '} (C#)new Char[] {',', ' '} (C#)

Char () = {"," c, "" c}) (Visual Basic)Char() = {","c, " "c}) (Visual Basic)
{"42", "", "12", "", "19"}{"42", "", "12", "", "19"}
"42..12..19""42..12..19" New Char [] {'. '}new Char[] {'.'} (C#)(C#)

Char () = {"." c} (Visual Basic)Char() = {"."c} (Visual Basic)
{"42", "", "12", "", "19"}{"42", "", "12", "", "19"}
Plátano"Banana" New Char [] {'. '}new Char[] {'.'} (C#)(C#)

Char () = {"." c} (Visual Basic)Char() = {"."c} (Visual Basic)
{"Banana"}{"Banana"}
"Darb\nSmarba" (C#)"Darb\nSmarba" (C#)

"Darb" & vbLf & "Smarba" (Visual Basic)"Darb" & vbLf & "Smarba" (Visual Basic)
New Char [] {} (C#)new Char[] {} (C#)

Char () = {} (Visual Basic)Char() = {} (Visual Basic)
{"Darb", "Smarba"}{"Darb", "Smarba"}
"Darb\nSmarba" (C#)"Darb\nSmarba" (C#)

"Darb" & vbLf & "Smarba" (Visual Basic)"Darb" & vbLf & "Smarba" (Visual Basic)
null (C#)null (C#)

Nothing (Visual Basic)Nothing (Visual Basic)
{"Darb", "Smarba"}{"Darb", "Smarba"}

La matriz de separadorThe separator array

Cada elemento del separador define un delimitador independiente que consta de un único carácter.Each element of separator defines a separate delimiter that consists of a single character. Si el separator argumento es null o no contiene caracteres, el método trata los caracteres de espacio en blanco como delimitadores.If the separator argument is null or contains no characters, the method treats white-space characters as the delimiters. El estándar Unicode define los caracteres de espacio en blanco. devuelven true si se pasan Char.IsWhiteSpace al método.White-space characters are defined by the Unicode standard; they return true if they are passed to the Char.IsWhiteSpace method.

String. Split (Char []) y resolución de sobrecarga del compiladorString.Split(Char[]) and compiler overload resolution

Aunque el único parámetro de esta sobrecarga de String.Split es una matriz de caracteres, puede llamarlo con un solo carácter, como se muestra en el ejemplo siguiente.Although the single parameter for this overload of String.Split is a character array, you can call it with a single character, as the following example shows.

String value = "This is a short string.";
Char delimiter = 's';
String[] substrings = value.Split(delimiter);
foreach (var substring in substrings)
   Console.WriteLine(substring);
// The example displays the following output:
//     Thi
//      i
//      a
//     hort
//     tring.
Module Example
   Public Sub Main()
      Dim value As String = "This is a short string."
      Dim delimiter As Char = "s"c
      Dim substrings() As String = value.Split(delimiter)
      For Each substring In substrings
         Console.WriteLine(substring)
      Next
   End Sub
End Module
' The example displays the following output:
'     Thi
'      i
'      a
'     hort
'     tring.

Dado que separator el parámetro se decora con ParamArrayAttribute el atributo, los compiladores interpretarán un único carácter como una matriz de caracteres de un solo elemento.Because the separator parameter is decorated with the ParamArrayAttribute attribute, compilers will interpret a single character as a single-element character array. Este no es el caso de otras String.Split sobrecargas que incluyen un separator parámetro; debe pasar explícitamente las separator sobrecargas de una matriz de caracteres como argumento.This is not the case for other String.Split overloads that include a separator parameter; you must explicitly pass these overloads a character array as the separator argument.

Detalles de comparaciónComparison details

El Split(Char[]) método extrae las subcadenas de esta cadena que están delimitadas por uno o varios de los caracteres separator de la matriz y devuelve esas subcadenas como elementos de una matriz.The Split(Char[]) method extracts the substrings in this string that are delimited by one or more of the characters in the separator array, and returns those substrings as elements of an array.

El Split(Char[]) método busca delimitadores realizando comparaciones mediante reglas de ordenación ordinal con distinción entre mayúsculas y minúsculas.The Split(Char[]) method looks for delimiters by performing comparisons using case-sensitive ordinal sort rules. Para obtener más información sobre las ordenaciones de palabras, cadenas y ordinales, vea la System.Globalization.CompareOptions enumeración.For more information about word, string, and ordinal sorts, see the System.Globalization.CompareOptions enumeration.

Consideraciones sobre el rendimientoPerformance Considerations

Los Split métodos asignan memoria para el objeto de matriz devuelto y un String objeto para cada elemento de la matriz.The Split methods allocate memory for the returned array object and a String object for each array element. Si la aplicación requiere un rendimiento óptimo o si la administración de la asignación de memoria es fundamental en la IndexOf aplicación IndexOfAny , considere la posibilidad de usar el método o.If your application requires optimal performance or if managing memory allocation is critical in your application, consider using the IndexOf or IndexOfAny method. También tiene la opción de usar el Compare método para buscar una subcadena dentro de una cadena.You also have the option of using the Compare method to locate a substring within a string.

Para dividir una cadena en un carácter separador, utilice IndexOf el IndexOfAny método o para buscar un carácter separador en la cadena.To split a string at a separator character, use the IndexOf or IndexOfAny method to locate a separator character in the string. Para dividir una cadena en una cadena separadora, use IndexOf el IndexOfAny método o para buscar el primer carácter de la cadena separadora.To split a string at a separator string, use the IndexOf or IndexOfAny method to locate the first character of the separator string. A continuación, Compare use el método para determinar si los caracteres situados después del primer carácter son iguales que los caracteres restantes de la cadena separadora.Then use the Compare method to determine whether the characters after that first character are equal to the remaining characters of the separator string.

Además, si se usa el mismo conjunto de caracteres para dividir cadenas en varias Split llamadas a métodos, considere la posibilidad de crear una sola matriz y hacer referencia a ella en cada llamada al método.In addition, if the same set of characters is used to split strings in multiple Split method calls, consider creating a single array and referencing it in each method call. Esto reduce significativamente la sobrecarga adicional de cada llamada al método.This significantly reduces the additional overhead of each method call.

Notas a los autores de las llamadas

Trim(Char[]) null separator Split(Char[]) En y versiones anteriores, si se pasa al método un que es o no contiene caracteres, el método usa un juego de caracteres ligeramente diferente para dividir la cadena de la que hace el método. .NET Framework 3,5.NET Framework 3.5 recorte la cadena.In the .NET Framework 3,5.NET Framework 3.5 and earlier versions, if the Split(Char[]) method is passed a separator that is null or contains no characters, the method uses a slightly different set of characters to split the string than the Trim(Char[]) method does to trim the string. A partir de la .NET Framework 4, ambos métodos usan un conjunto idéntico de caracteres de espacio en blanco Unicode.Starting with the .NET Framework 4, both methods use an identical set of Unicode white-space characters.

Consulte también:

Se aplica a