String.Join String.Join String.Join String.Join Method

Definición

Concatena los elementos de la matriz especificada o los miembros de una colección, usando el separador indicado entre todos los elementos o miembros.Concatenates the elements of a specified array or the members of a collection, using the specified separator between each element or member.

Sobrecargas

Join(String, String[], Int32, Int32) Join(String, String[], Int32, Int32) Join(String, String[], Int32, Int32) Join(String, String[], Int32, Int32)

Concatena los elementos especificados de una matriz de cadenas, usando el separador indicado entre todos los elementos.Concatenates the specified elements of a string array, using the specified separator between each element.

Join(Char, String[], Int32, Int32) Join(Char, String[], Int32, Int32) Join(Char, String[], Int32, Int32) Join(Char, String[], Int32, Int32)
Join(String, String[]) Join(String, String[]) Join(String, String[]) Join(String, String[])

Concatena todos los elementos de una matriz de cadenas, usando el separador especificado entre todos los elementos.Concatenates all the elements of a string array, using the specified separator between each element.

Join(String, Object[]) Join(String, Object[]) Join(String, Object[]) Join(String, Object[])

Concatena los elementos de una matriz de objetos, usando el separador especificado entre todos los elementos.Concatenates the elements of an object array, using the specified separator between each element.

Join(String, IEnumerable<String>) Join(String, IEnumerable<String>) Join(String, IEnumerable<String>) Join(String, IEnumerable<String>)

Concatena los miembros de una colección IEnumerable<T> construida de tipo String, usando el separador especificado entre todos los miembros.Concatenates the members of a constructed IEnumerable<T> collection of type String, using the specified separator between each member.

Join(Char, String[]) Join(Char, String[]) Join(Char, String[]) Join(Char, String[])
Join(Char, Object[]) Join(Char, Object[]) Join(Char, Object[]) Join(Char, Object[])
Join<T>(Char, IEnumerable<T>) Join<T>(Char, IEnumerable<T>) Join<T>(Char, IEnumerable<T>) Join<T>(Char, IEnumerable<T>)
Join<T>(String, IEnumerable<T>) Join<T>(String, IEnumerable<T>) Join<T>(String, IEnumerable<T>) Join<T>(String, IEnumerable<T>)

Concatena los miembros de una colección, usando el separador especificado entre todos los miembros.Concatenates the members of a collection, using the specified separator between each member.

Join(String, String[], Int32, Int32) Join(String, String[], Int32, Int32) Join(String, String[], Int32, Int32) Join(String, String[], Int32, Int32)

Concatena los elementos especificados de una matriz de cadenas, usando el separador indicado entre todos los elementos.Concatenates the specified elements of a string array, using the specified separator between each element.

public:
 static System::String ^ Join(System::String ^ separator, cli::array <System::String ^> ^ value, int startIndex, int count);
public static string Join (string separator, string[] value, int startIndex, int count);
static member Join : string * string[] * int * int -> string
Public Shared Function Join (separator As String, value As String(), startIndex As Integer, count As Integer) As String

Parámetros

separator
String String String String

Cadena que se va a usar como separador.The string to use as a separator. separator se incluye en la cadena devuelta solo si value tiene más de un elemento.separator is included in the returned string only if value has more than one element.

value
String[]

Matriz que contiene los elementos que se van a concatenar.An array that contains the elements to concatenate.

startIndex
Int32 Int32 Int32 Int32

Primer elemento de value que se va a usar.The first element in value to use.

count
Int32 Int32 Int32 Int32

Número de elementos de value que se van a usar.The number of elements of value to use.

Devoluciones

Cadena que consta de las cadenas de value delimitadas por la cadena de separator.A string that consists of the strings in value delimited by the separator string.

o bien-or- Empty si el valor de count es cero, value no tiene elementos, o separator y todos los elementos de value tienen el valor Empty.Empty if count is zero, value has no elements, or separator and all the elements of value are Empty.

Excepciones

startIndex o count es menor que 0.startIndex or count is less than 0.

O bien-or- startIndex más count es mayor que el número de elementos de value.startIndex plus count is greater than the number of elements in value.

Ejemplos

En el ejemplo siguiente se concatena dos elementos de una matriz de nombres de fruta.The following example concatenates two elements from an array of names of fruit.

// Sample for String::Join(String, String[], int int)
using namespace System;
int main()
{
   array<String^>^val = {"apple","orange","grape","pear"};
   String^ sep = ", ";
   String^ result;
   Console::WriteLine( "sep = '{0}'", sep );
   Console::WriteLine( "val[] = {{'{0}' '{1}' '{2}' '{3}'}}", val[ 0 ], val[ 1 ], val[ 2 ], val[ 3 ] );
   result = String::Join( sep, val, 1, 2 );
   Console::WriteLine( "String::Join(sep, val, 1, 2) = '{0}'", result );
}

/*
This example produces the following results:
sep = ', '
val[] = {'apple' 'orange' 'grape' 'pear'}
String::Join(sep, val, 1, 2) = 'orange, grape'
*/
// Sample for String.Join(String, String[], int int)
using System;

class Sample {
    public static void Main() {
    String[] val = {"apple", "orange", "grape", "pear"};
    String sep   = ", ";
    String result;

    Console.WriteLine("sep = '{0}'", sep);
    Console.WriteLine("val[] = {{'{0}' '{1}' '{2}' '{3}'}}", val[0], val[1], val[2], val[3]);
    result = String.Join(sep, val, 1, 2);
    Console.WriteLine("String.Join(sep, val, 1, 2) = '{0}'", result);
    }
}
/*
This example produces the following results:
sep = ', '
val[] = {'apple' 'orange' 'grape' 'pear'}
String.Join(sep, val, 1, 2) = 'orange, grape'
*/
Class Sample
   Public Shared Sub Main()
      Dim val As [String]() =  {"apple", "orange", "grape", "pear"}
      Dim sep As [String] = ", "
      Dim result As [String]
      
      Console.WriteLine("sep = '{0}'", sep)
      Console.WriteLine("val() = {{'{0}' '{1}' '{2}' '{3}'}}", val(0), val(1), val(2), val(3))
      result = [String].Join(sep, val, 1, 2)
      Console.WriteLine("String.Join(sep, val, 1, 2) = '{0}'", result)
   End Sub
End Class 
'This example displays the following output:
'       sep = ', '
'       val() = {'apple' 'orange' 'grape' 'pear'}
'       String.Join(sep, val, 1, 2) = 'orange, grape'

Comentarios

Por ejemplo, si separator es "," y los elementos de value son "manzana", "orange", "uva" y "pera", Join(separator, value, 1, 2) devuelve "naranja, uva".For example, if separator is ", " and the elements of value are "apple", "orange", "grape", and "pear", Join(separator, value, 1, 2) returns "orange, grape".

Si separator es null, una cadena vacía (String.Empty) se usa en su lugar.If separator is null, an empty string (String.Empty) is used instead. Si algún elemento value es null, una cadena vacía se usa en su lugar.If any element in value is null, an empty string is used instead.

Consulte también:

Join(Char, String[], Int32, Int32) Join(Char, String[], Int32, Int32) Join(Char, String[], Int32, Int32) Join(Char, String[], Int32, Int32)

public:
 static System::String ^ Join(char separator, cli::array <System::String ^> ^ value, int startIndex, int count);
public static string Join (char separator, string[] value, int startIndex, int count);
static member Join : char * string[] * int * int -> string
Public Shared Function Join (separator As Char, value As String(), startIndex As Integer, count As Integer) As String

Parámetros

separator
Char Char Char Char
value
String[]
startIndex
Int32 Int32 Int32 Int32

Devoluciones

Join(String, String[]) Join(String, String[]) Join(String, String[]) Join(String, String[])

Concatena todos los elementos de una matriz de cadenas, usando el separador especificado entre todos los elementos.Concatenates all the elements of a string array, using the specified separator between each element.

public:
 static System::String ^ Join(System::String ^ separator, ... cli::array <System::String ^> ^ value);
public static string Join (string separator, params string[] value);
static member Join : string * string[] -> string
Public Shared Function Join (separator As String, ParamArray value As String()) As String

Parámetros

separator
String String String String

Cadena que se va a usar como separador.The string to use as a separator. separator se incluye en la cadena devuelta solo si value tiene más de un elemento.separator is included in the returned string only if value has more than one element.

value
String[]

Matriz que contiene los elementos que se van a concatenar.An array that contains the elements to concatenate.

Devoluciones

Cadena que consta de los elementos de value delimitados por la cadena de separator.A string that consists of the elements in value delimited by the separator string. Si value es una matriz vacía, el método devuelve Empty.If value is an empty array, the method returns Empty.

Excepciones

Ejemplos

En el ejemplo siguiente se muestra el Join método.The following example demonstrates the Join method.

using namespace System;
String^ MakeLine( int initVal, int multVal, String^ sep )
{
   array<String^>^sArr = gcnew array<String^>(10);
   for ( int i = initVal; i < initVal + 10; i++ )
      sArr[ i - initVal ] = String::Format( "{0, -3}", i * multVal );
   return String::Join( sep, sArr );
}

int main()
{
   Console::WriteLine( MakeLine( 0, 5, ", " ) );
   Console::WriteLine( MakeLine( 1, 6, "  " ) );
   Console::WriteLine( MakeLine( 9, 9, ": " ) );
   Console::WriteLine( MakeLine( 4, 7, "< " ) );
}
// The example displays the following output:
//       0  , 5  , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45
//       6    12   18   24   30   36   42   48   54   60
//       81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162
//       28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91
using System;

public class JoinTest {
    public static void Main() {

        Console.WriteLine(MakeLine(0, 5, ", "));
        Console.WriteLine(MakeLine(1, 6, "  "));
        Console.WriteLine(MakeLine(9, 9, ": "));
        Console.WriteLine(MakeLine(4, 7, "< "));
    }

    private static string MakeLine(int initVal, int multVal, string sep) {

        string [] sArr = new string [10];

        for (int i = initVal; i < initVal + 10; i++)
            sArr[i - initVal] = String.Format("{0,-3}", i * multVal);

        return String.Join(sep, sArr);
    }
}
// The example displays the following output:
//       0  , 5  , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45
//       6    12   18   24   30   36   42   48   54   60
//       81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162
//       28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91  
Imports System

Public Class JoinTest
    
    Public Shared Sub Main()
        
        Console.WriteLine(MakeLine(0, 5, ", "))
        Console.WriteLine(MakeLine(1, 6, "  "))
        Console.WriteLine(MakeLine(9, 9, ": "))
        Console.WriteLine(MakeLine(4, 7, "< "))
    End Sub 'Main
    
    
    Private Shared Function MakeLine(initVal As Integer, multVal As Integer, sep As String) As String
        Dim sArr(10) As String
        Dim i As Integer
        
        
        For i = initVal To (initVal + 10) - 1
            sArr((i - initVal)) = [String].Format("{0,-3}", i * multVal)
        
        Next i
        Return [String].Join(sep, sArr)
    End Function 'MakeLine
End Class 'JoinTest
' The example displays the following output:
'       0  , 5  , 10 , 15 , 20 , 25 , 30 , 35 , 40 , 45
'       6    12   18   24   30   36   42   48   54   60
'       81 : 90 : 99 : 108: 117: 126: 135: 144: 153: 162
'       28 < 35 < 42 < 49 < 56 < 63 < 70 < 77 < 84 < 91

Comentarios

Por ejemplo, si separator es "," y los elementos de value son "manzana", "orange", "uva" y "pera", Join(separator, value) devuelve "manzana, naranja, uva, pera".For example, if separator is ", " and the elements of value are "apple", "orange", "grape", and "pear", Join(separator, value) returns "apple, orange, grape, pear".

Si separator es null, una cadena vacía (String.Empty) se usa en su lugar.If separator is null, an empty string (String.Empty) is used instead. Si algún elemento value es null, una cadena vacía se usa en su lugar.If any element in value is null, an empty string is used instead.

Consulte también:

Join(String, Object[]) Join(String, Object[]) Join(String, Object[]) Join(String, Object[])

Concatena los elementos de una matriz de objetos, usando el separador especificado entre todos los elementos.Concatenates the elements of an object array, using the specified separator between each element.

public:
 static System::String ^ Join(System::String ^ separator, ... cli::array <System::Object ^> ^ values);
[System.Runtime.InteropServices.ComVisible(false)]
public static string Join (string separator, params object[] values);
static member Join : string * obj[] -> string
Public Shared Function Join (separator As String, ParamArray values As Object()) As String

Parámetros

separator
String String String String

Cadena que se va a usar como separador.The string to use as a separator. separator se incluye en la cadena devuelta solo si values tiene más de un elemento.separator is included in the returned string only if values has more than one element.

values
Object[]

Matriz que contiene los elementos que se van a concatenar.An array that contains the elements to concatenate.

Devoluciones

Cadena que consta de los elementos de values delimitados por la cadena de separator.A string that consists of the elements of values delimited by the separator string. Si values es una matriz vacía, el método devuelve Empty.If values is an empty array, the method returns Empty.

Excepciones

Ejemplos

En el ejemplo siguiente se usa el algoritmo criba de Eratóstenes para calcular los números primos que son menores o iguales que 100.The following example uses the Sieve of Eratosthenes algorithm to calculate the prime numbers that are less than or equal to 100. Asigna el resultado a una matriz de enteros, que, a continuación, pasa a la Join(String, Object[]) método.It assigns the result to a integer array, which it then passes to the Join(String, Object[]) method.

using System;
using System.Collections.Generic;

public class Example
{
   public static void Main()
   {
      int maxPrime = 100;
      int[] primes = GetPrimes(maxPrime);
      Console.WriteLine("Primes less than {0}:", maxPrime);
      Console.WriteLine("   {0}", String.Join(" ", primes));
   }

   private static int[] GetPrimes(int maxPrime)
   {
      Array values = Array.CreateInstance(typeof(int), 
                              new int[] { maxPrime - 1}, new int[] { 2 }); 
      // Use Sieve of Eratosthenes to determine prime numbers.
      for (int ctr = values.GetLowerBound(0); ctr <= (int) Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))); ctr++)
      {
                           
         if ((int) values.GetValue(ctr) == 1) continue;
         
         for (int multiplier = ctr; multiplier <=  maxPrime / 2; multiplier++)
            if (ctr * multiplier <= maxPrime)
               values.SetValue(1, ctr * multiplier);
      }      
      
      List<int> primes = new List<int>();
      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)
         if ((int) values.GetValue(ctr) == 0) 
            primes.Add(ctr);
      return primes.ToArray();
   }   
}
// The example displays the following output:
//    Primes less than 100:
//       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Module Example
   Public Sub Main()
      Dim maxPrime As Integer = 100
      Dim primes() As Integer = GetPrimes(maxPrime)
      Console.WriteLine("Primes less than {0}:", maxPrime)
      Console.WriteLine("   {0}", String.Join(" ", primes))
   End Sub
   
   Private Function GetPrimes(maxPrime As Integer) As Integer()
      Dim values As Array = Array.CreateInstance(GetType(Integer), _
                              New Integer() { maxPrime - 1}, New Integer(){ 2 }) 
        ' Use Sieve of Eratosthenes to determine prime numbers.
      For ctr As Integer = values.GetLowerBound(0) To _
                           CInt(Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))))
         If CInt(values.GetValue(ctr)) = 1 Then Continue For
         
         For multiplier As Integer = ctr To maxPrime \ 2
            If ctr * multiplier <= maxPrime Then values.SetValue(1, ctr * multiplier)
         Next   
      Next      
      
      Dim primes As New System.Collections.Generic.List(Of Integer)
      For ctr As Integer = values.GetLowerBound(0) To values.GetUpperBound(0)
         If CInt(values.GetValue(ctr)) = 0 Then primes.Add(ctr)
      Next            
      Return primes.ToArray()
   End Function   
End Module
' The example displays the following output:
'    Primes less than 100:
'       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Comentarios

Si separator es null o si algún elemento de values no sea el primer elemento es null, una cadena vacía (String.Empty) se usa en su lugar.If separator is null or if any element of values other than the first element is null, an empty string (String.Empty) is used instead. Consulte la sección Notas a los autores de llamadas si el primer elemento de values es null.See the Notes for Callers section if the first element of values is null.

Join(String, Object[]) es un método de conveniencia que le permite concatenar cada elemento en una matriz de objetos sin convertir explícitamente sus elementos en cadenas.Join(String, Object[]) is a convenience method that lets you concatenate each element in an object array without explicitly converting its elements to strings. La representación de cadena de cada objeto de la matriz se deriva mediante una llamada a ese objeto ToString método.The string representation of each object in the array is derived by calling that object's ToString method.

Notas a los autores de las llamadas

Si el primer elemento de values es null, Join(String, Object[]) método no concatenar los elementos de values , sino que devuelve Empty.If the first element of values is null, the Join(String, Object[]) method does not concatenate the elements in values but instead returns Empty. Existen varias soluciones para resolver este problema.A number of workarounds for this issue are available. La más fácil es asignar un valor de Empty al primer elemento de la matriz, como en el ejemplo siguiente se muestra.The easiest is to assign a value of Empty to the first element of the array, as the following example shows.

[! código csharpSystem.String.Join#6] [! código vbSystem.String.Join#6][!code-csharpSystem.String.Join#6] [!code-vbSystem.String.Join#6]

Consulte también:

Join(String, IEnumerable<String>) Join(String, IEnumerable<String>) Join(String, IEnumerable<String>) Join(String, IEnumerable<String>)

Concatena los miembros de una colección IEnumerable<T> construida de tipo String, usando el separador especificado entre todos los miembros.Concatenates the members of a constructed IEnumerable<T> collection of type String, using the specified separator between each member.

public:
 static System::String ^ Join(System::String ^ separator, System::Collections::Generic::IEnumerable<System::String ^> ^ values);
[System.Runtime.InteropServices.ComVisible(false)]
public static string Join (string separator, System.Collections.Generic.IEnumerable<string> values);
static member Join : string * seq<string> -> string
Public Shared Function Join (separator As String, values As IEnumerable(Of String)) As String

Parámetros

separator
String String String String

Cadena que se va a usar como separador.separatorThe string to use as a separator.separator se incluye en la cadena devuelta solo si values tiene más de un elemento.is included in the returned string only if values has more than one element.

values
IEnumerable<String>

Colección que contiene las cadenas que se van a concatenar.A collection that contains the strings to concatenate.

Devoluciones

Cadena que consta de los miembros de values delimitados por la cadena de separator.A string that consists of the members of values delimited by the separator string. Si values no tiene ningún miembro, el método devuelve Empty.If values has no members, the method returns Empty.

Excepciones

Ejemplos

En el ejemplo siguiente se usa el algoritmo criba de Eratóstenes para calcular los números primos que son menores o iguales que 100.The following example uses the Sieve of Eratosthenes algorithm to calculate the prime numbers that are less than or equal to 100. Asigna el resultado a un List<T> objeto de tipo String, que, a continuación, pasa a la Join(String, IEnumerable<String>) método.It assigns the result to a List<T> object of type String, which it then passes to the Join(String, IEnumerable<String>) method.

using System;
using System.Collections.Generic;

public class Example
{
   public static void Main()
   {
      int maxPrime = 100;
      List<int> primes = GetPrimes(maxPrime);
      Console.WriteLine("Primes less than {0}:", maxPrime);
      Console.WriteLine("   {0}", String.Join(" ", primes));
   }

   private static List<int> GetPrimes(int maxPrime)
   {
      Array values = Array.CreateInstance(typeof(int), 
                              new int[] { maxPrime - 1}, new int[] { 2 });
      // Use Sieve of Eratosthenes to determine prime numbers.
      for (int ctr = values.GetLowerBound(0); ctr <= (int) Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))); ctr++)
      {
                           
         if ((int) values.GetValue(ctr) == 1) continue;
         
         for (int multiplier = ctr; multiplier <=  maxPrime / 2; multiplier++)
            if (ctr * multiplier <= maxPrime)
               values.SetValue(1, ctr * multiplier);
      }      
      
      List<int> primes = new List<int>();
      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)
         if ((int) values.GetValue(ctr) == 0) 
            primes.Add(ctr);
      return primes;
   }   
}
// The example displays the following output:
//    Primes less than 100:
//       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Imports System.Collections.Generic

Module Example
   Public Sub Main()
      Dim maxPrime As Integer = 100
      Dim primes As List(Of String) = GetPrimes(maxPrime)
      Console.WriteLine("Primes less than {0}:", maxPrime)
      Console.WriteLine("   {0}", String.Join(" ", primes))
   End Sub
   
   Private Function GetPrimes(maxPrime As Integer) As List(Of String)
      Dim values As Array = Array.CreateInstance(GetType(Integer), _
                              New Integer() { maxPrime - 1}, New Integer(){ 2 }) 
        ' Use Sieve of Eratosthenes to determine prime numbers.
      For ctr As Integer = values.GetLowerBound(0) To _
                           CInt(Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))))
         If CInt(values.GetValue(ctr)) = 1 Then Continue For
         
         For multiplier As Integer = ctr To maxPrime \ 2
            If ctr * multiplier <= maxPrime Then values.SetValue(1, ctr * multiplier)
         Next   
      Next      
      
      Dim primes As New List(Of String)
      For ctr As Integer = values.GetLowerBound(0) To values.GetUpperBound(0)
         If CInt(values.GetValue(ctr)) = 0 Then primes.Add(ctr.ToString())
      Next            
      Return primes
   End Function   
End Module
' The example displays the following output:
'    Primes less than 100:
'       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Comentarios

Si separator es null, una cadena vacía (String.Empty) se usa en su lugar.If separator is null, an empty string (String.Empty) is used instead. Si cualquier miembro de values es null, una cadena vacía se usa en su lugar.If any member of values is null, an empty string is used instead.

Join(String, IEnumerable<String>) es un método de conveniencia que le permite concatenar cada elemento de un IEnumerable(Of String) colección sin convertir primero los elementos en una matriz de cadenas.Join(String, IEnumerable<String>) is a convenience method that lets you concatenate each element in an IEnumerable(Of String) collection without first converting the elements to a string array. Es especialmente útil con expresiones de consulta de Language-Integrated Query (LINQ).It is particularly useful with Language-Integrated Query (LINQ) query expressions. En el ejemplo siguiente se pasa un List(Of String) objeto que contiene las letras mayúsculas o minúsculas del alfabeto a una expresión lambda que selecciona las letras que sean igual o mayor que una letra determinada (que, en el ejemplo, es "M").The following example passes a List(Of String) object that contains either the uppercase or lowercase letters of the alphabet to a lambda expression that selects letters that are equal to or greater than a particular letter (which, in the example, is "M"). El IEnumerable(Of String) colección devuelta por la Enumerable.Where método se pasa a la Join(String, IEnumerable<String>) método para mostrar el resultado como una sola cadena.The IEnumerable(Of String) collection returned by the Enumerable.Where method is passed to the Join(String, IEnumerable<String>) method to display the result as a single string.

using System;
using System.Collections.Generic;
using System.Linq;

public class Example
{
   public static void Main()
   {
      string output = String.Join(" ", GetAlphabet(true).Where( letter => 
                      letter.CompareTo("M") >= 0));
      Console.WriteLine(output);  
   }

   private static List<string> GetAlphabet(bool upper)
   {
      List<string> alphabet = new List<string>();
      int charValue = upper ? 65 : 97;
      for (int ctr = 0; ctr <= 25; ctr++)
         alphabet.Add(Convert.ToChar(charValue + ctr).ToString());
      return alphabet; 
   }
}
// The example displays the following output:
//      M N O P Q R S T U V W X Y Z
Imports System.Collections.Generic
Imports System.Linq

Module modMain
   Public Sub Main()
      Dim output As String = String.Join(" ", GetAlphabet(True).Where(Function(letter) _
                                                         letter >= "M"))
        
      Console.WriteLine(output)                                     
   End Sub
   
   Private Function GetAlphabet(upper As Boolean) As List(Of String)
      Dim alphabet As New List(Of String)
      Dim charValue As Integer = CInt(IIf(upper, 65, 97))
      For ctr As Integer = 0 To 25
         alphabet.Add(ChrW(charValue + ctr).ToString())
      Next
      Return alphabet 
   End Function
End Module
' The example displays the following output:
'      M N O P Q R S T U V W X Y Z
Consulte también:

Join(Char, String[]) Join(Char, String[]) Join(Char, String[]) Join(Char, String[])

public:
 static System::String ^ Join(char separator, ... cli::array <System::String ^> ^ value);
public static string Join (char separator, params string[] value);
static member Join : char * string[] -> string
Public Shared Function Join (separator As Char, ParamArray value As String()) As String

Parámetros

separator
Char Char Char Char
value
String[]

Devoluciones

Join(Char, Object[]) Join(Char, Object[]) Join(Char, Object[]) Join(Char, Object[])

public:
 static System::String ^ Join(char separator, ... cli::array <System::Object ^> ^ values);
public static string Join (char separator, params object[] values);
static member Join : char * obj[] -> string
Public Shared Function Join (separator As Char, ParamArray values As Object()) As String

Parámetros

separator
Char Char Char Char
values
Object[]

Devoluciones

Join<T>(Char, IEnumerable<T>) Join<T>(Char, IEnumerable<T>) Join<T>(Char, IEnumerable<T>) Join<T>(Char, IEnumerable<T>)

public:
generic <typename T>
 static System::String ^ Join(char separator, System::Collections::Generic::IEnumerable<T> ^ values);
public static string Join<T> (char separator, System.Collections.Generic.IEnumerable<T> values);
static member Join : char * seq<'T> -> string
Public Shared Function Join(Of T) (separator As Char, values As IEnumerable(Of T)) As String

Parámetros de tipo

T

Parámetros

separator
Char Char Char Char

Devoluciones

Join<T>(String, IEnumerable<T>) Join<T>(String, IEnumerable<T>) Join<T>(String, IEnumerable<T>) Join<T>(String, IEnumerable<T>)

Concatena los miembros de una colección, usando el separador especificado entre todos los miembros.Concatenates the members of a collection, using the specified separator between each member.

public:
generic <typename T>
 static System::String ^ Join(System::String ^ separator, System::Collections::Generic::IEnumerable<T> ^ values);
[System.Runtime.InteropServices.ComVisible(false)]
public static string Join<T> (string separator, System.Collections.Generic.IEnumerable<T> values);
static member Join : string * seq<'T> -> string
Public Shared Function Join(Of T) (separator As String, values As IEnumerable(Of T)) As String

Parámetros de tipo

T

Tipo de los miembros de values.The type of the members of values.

Parámetros

separator
String String String String

Cadena que se va a usar como separador.separatorThe string to use as a separator.separator se incluye en la cadena devuelta solo si values tiene más de un elemento.is included in the returned string only if values has more than one element.

values
IEnumerable<T> IEnumerable<T> IEnumerable<T> IEnumerable<T>

Colección que contiene los objetos que se van a concatenar.A collection that contains the objects to concatenate.

Devoluciones

Cadena que consta de los miembros de values delimitados por la cadena de separator.A string that consists of the members of values delimited by the separator string. Si values no tiene ningún miembro, el método devuelve Empty.If values has no members, the method returns Empty.

Excepciones

Ejemplos

En el ejemplo siguiente se usa el algoritmo criba de Eratóstenes para calcular los números primos que son menores o iguales que 100.The following example uses the Sieve of Eratosthenes algorithm to calculate the prime numbers that are less than or equal to 100. Asigna el resultado a un List<T> objeto de tipo entero, que, a continuación, pasa a la Join<T>(String, IEnumerable<T>) método.It assigns the result to a List<T> object of type integer, which it then passes to the Join<T>(String, IEnumerable<T>) method.

using System;
using System.Collections.Generic;

public class Example
{
   public static void Main()
   {
      int maxPrime = 100;
      List<int> primes = GetPrimes(maxPrime);
      Console.WriteLine("Primes less than {0}:", maxPrime);
      Console.WriteLine("   {0}", String.Join(" ", primes));
   }

   private static List<int> GetPrimes(int maxPrime)
   {
      Array values = Array.CreateInstance(typeof(int), 
                              new int[] { maxPrime - 1}, new int[] { 2 });
      // Use Sieve of Eratosthenes to determine prime numbers.
      for (int ctr = values.GetLowerBound(0); ctr <= (int) Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))); ctr++)
      {
                           
         if ((int) values.GetValue(ctr) == 1) continue;
         
         for (int multiplier = ctr; multiplier <=  maxPrime / 2; multiplier++)
            if (ctr * multiplier <= maxPrime)
               values.SetValue(1, ctr * multiplier);
      }      
      
      List<int> primes = new List<int>();
      for (int ctr = values.GetLowerBound(0); ctr <= values.GetUpperBound(0); ctr++)
         if ((int) values.GetValue(ctr) == 0) 
            primes.Add(ctr);
      return primes;
   }   
}
// The example displays the following output:
//    Primes less than 100:
//       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Imports System.Collections.Generic

Module Example
   Public Sub Main()
      Dim maxPrime As Integer = 100
      Dim primes As List(Of Integer) = GetPrimes(maxPrime)
      Console.WriteLine("Primes less than {0}:", maxPrime)
      Console.WriteLine("   {0}", String.Join(" ", primes))
   End Sub
   
   Private Function GetPrimes(maxPrime As Integer) As List(Of Integer)
      Dim values As Array = Array.CreateInstance(GetType(Integer), _
                              New Integer() { maxPrime - 1}, New Integer(){ 2 }) 
        ' Use Sieve of Eratosthenes to determine prime numbers.
      For ctr As Integer = values.GetLowerBound(0) To _
                           CInt(Math.Ceiling(Math.Sqrt(values.GetUpperBound(0))))
         If CInt(values.GetValue(ctr)) = 1 Then Continue For
         
         For multiplier As Integer = ctr To maxPrime \ 2
            If ctr * multiplier <= maxPrime Then values.SetValue(1, ctr * multiplier)
         Next   
      Next      
      
      Dim primes As New System.Collections.Generic.List(Of Integer)
      For ctr As Integer = values.GetLowerBound(0) To values.GetUpperBound(0)
         If CInt(values.GetValue(ctr)) = 0 Then primes.Add(ctr)
      Next            
      Return primes
   End Function   
End Module
' The example displays the following output:
'    Primes less than 100:
'       2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Comentarios

Si separator es null, una cadena vacía (String.Empty) se usa en su lugar.If separator is null, an empty string (String.Empty) is used instead. Si cualquier miembro de values es null, una cadena vacía se usa en su lugar.If any member of values is null, an empty string is used instead.

Join<T>(String, IEnumerable<T>) es un método de conveniencia que le permite concatenar cada miembro de un IEnumerable<T> colección sin convertirlos antes a cadenas.Join<T>(String, IEnumerable<T>) is a convenience method that lets you concatenate each member of an IEnumerable<T> collection without first converting them to strings. La representación de cadena de cada objeto en el IEnumerable<T> se derivó la colección mediante una llamada a ese objeto ToString método.The string representation of each object in the IEnumerable<T> collection is derived by calling that object's ToString method.

Este método es especialmente útil con expresiones de consulta de Language-Integrated Query (LINQ).This method is particular useful with Language-Integrated Query (LINQ) query expressions. Por ejemplo, el código siguiente define un método muy sencillo Animal clase que contiene el nombre de un animal y el orden al que pertenece.For example, the following code defines a very simple Animal class that contains the name of an animal and the order to which it belongs. A continuación, define un List<T> objeto que contiene un número de Animal objetos.It then defines a List<T> object that contains a number of Animal objects. El Enumerable.Where se denomina método de extensión para extraer el Animal objetos cuya propiedad Order propiedad es igual a "Roedor".The Enumerable.Where extension method is called to extract the Animal objects whose Order property equals "Rodent". El resultado se pasa a la Join<T>(String, IEnumerable<T>) método.The result is passed to the Join<T>(String, IEnumerable<T>) method.

using System;
using System.Collections.Generic;
using System.Linq;

public class Animal
{
   public string Kind;
   public string Order;
   
   public Animal(string kind, string order)
   {
      this.Kind = kind;
      this.Order = order;
   }
   
   public override string ToString()
   {
      return this.Kind;
   }
}

public class Example
{
   public static void Main()
   {
      List<Animal> animals = new List<Animal>();
      animals.Add(new Animal("Squirrel", "Rodent"));
      animals.Add(new Animal("Gray Wolf", "Carnivora"));
      animals.Add(new Animal("Capybara", "Rodent"));
      string output = String.Join(" ", animals.Where( animal => 
                      (animal.Order == "Rodent")));
      Console.WriteLine(output);  
   }
}
// The example displays the following output:
//      Squirrel Capybara
Imports System.Collections.Generic

Public Class Animal
   Public Kind As String
   Public Order As String
   
   Public Sub New(kind As String, order As String)
      Me.Kind = kind
      Me.Order = order
   End Sub
   
   Public Overrides Function ToString() As String
      Return Me.Kind
   End Function
End Class

Module Example
   Public Sub Main()
      Dim animals As New List(Of Animal)
      animals.Add(New Animal("Squirrel", "Rodent"))
      animals.Add(New Animal("Gray Wolf", "Carnivora"))
      animals.Add(New Animal("Capybara", "Rodent")) 
      Dim output As String = String.Join(" ", animals.Where(Function(animal) _
                                           animal.Order = "Rodent"))
      Console.WriteLine(output)                                           
   End Sub
End Module
' The example displays the following output:
'      Squirrel Capybara
Consulte también:

Se aplica a