StringCollection.Add(String) Método

Definición

Espacio de nombres:
System.Collections.Specialized
Ensamblados:
System.dll, System.Collections.Specialized.dll
Ensamblado:
System.dll
Ensamblado:
netstandard.dll

Agrega una cadena al final de .StringCollection

public:
 int Add(System::String ^ value);
public int Add(string value);
member this.Add : string -> int
Public Function Add (value As String) As Integer

Parámetros

value
String

Cadena que se va a agregar al final de .StringCollection El valor puede ser null.

Devoluciones

Int32

Índice de base cero en el que se inserta el nuevo elemento.

Ejemplos

En el ejemplo de código siguiente se agregan nuevos elementos a .StringCollection

using System;
using System.Collections;
using System.Collections.Specialized;

public class SamplesStringCollection  {

   public static void Main()  {

      // Creates and initializes a new StringCollection.
      StringCollection myCol = new StringCollection();

      Console.WriteLine( "Initial contents of the StringCollection:" );
      PrintValues( myCol );

      // Adds a range of elements from an array to the end of the StringCollection.
      String[] myArr = new String[] { "RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED" };
      myCol.AddRange( myArr );

      Console.WriteLine( "After adding a range of elements:" );
      PrintValues( myCol );

      // Adds one element to the end of the StringCollection and inserts another at index 3.
      myCol.Add( "* white" );
      myCol.Insert( 3, "* gray" );

      Console.WriteLine( "After adding \"* white\" to the end and inserting \"* gray\" at index 3:" );
      PrintValues( myCol );
   }

   public static void PrintValues( IEnumerable myCol )  {
      foreach ( Object obj in myCol )
         Console.WriteLine( "   {0}", obj );
      Console.WriteLine();
   }
}

/*
This code produces the following output.

Initial contents of the StringCollection:

After adding a range of elements:
   RED
   orange
   yellow
   RED
   green
   blue
   RED
   indigo
   violet
   RED

After adding "* white" to the end and inserting "* gray" at index 3:
   RED
   orange
   yellow
   * gray
   RED
   green
   blue
   RED
   indigo
   violet
   RED
   * white

*/

Imports System.Collections
Imports System.Collections.Specialized

Public Class SamplesStringCollection   

   Public Shared Sub Main()

      ' Creates and initializes a new StringCollection.
      Dim myCol As New StringCollection()

      Console.WriteLine("Initial contents of the StringCollection:")
      PrintValues(myCol)

      ' Adds a range of elements from an array to the end of the StringCollection.
      Dim myArr() As [String] = {"RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED"}
      myCol.AddRange(myArr)

      Console.WriteLine("After adding a range of elements:")
      PrintValues(myCol)

      ' Adds one element to the end of the StringCollection and inserts another at index 3.
      myCol.Add("* white")
      myCol.Insert(3, "* gray")

      Console.WriteLine("After adding ""* white"" to the end and inserting ""* gray"" at index 3:")
      PrintValues(myCol)

   End Sub

   Public Shared Sub PrintValues(myCol As IEnumerable)
      Dim obj As [Object]
      For Each obj In  myCol
         Console.WriteLine("   {0}", obj)
      Next obj
      Console.WriteLine()
   End Sub

End Class


'This code produces the following output.
'
'Initial contents of the StringCollection:
'
'After adding a range of elements:
'   RED
'   orange
'   yellow
'   RED
'   green
'   blue
'   RED
'   indigo
'   violet
'   RED
'
'After adding "* white" to the end and inserting "* gray" at index 3:
'   RED
'   orange
'   yellow
'   * gray
'   RED
'   green
'   blue
'   RED
'   indigo
'   violet
'   RED
'   * white
'

Comentarios

StringCollection acepta null como un valor válido y permite elementos duplicados.

Si Count es menor que la capacidad, este método es una operación de O(1). Si es necesario aumentar la capacidad para acomodar el nuevo elemento, este método se convierte en una operación O(n), donde n es Count.

Se aplica a

Consulte también