ArrayList.Add-Methode

Fügt am Ende von ArrayList ein Objekt hinzu.

Namespace: System.Collections
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Overridable Function Add ( _
    value As Object _
) As Integer
'Usage
Dim instance As ArrayList
Dim value As Object
Dim returnValue As Integer

returnValue = instance.Add(value)

public virtual int Add (
    Object value
)

public:
virtual int Add (
    Object^ value
)

public int Add (
    Object value
)

public function Add (
    value : Object
) : int

Parameter

• value
  Das Object, das am Ende der ArrayList hinzugefügt werden soll. Der Wert kann NULL (Nothing in Visual Basic) sein.

Rückgabewert

Der ArrayList-Index, an dem value hinzugefügt wurde.

Ausnahmen

Ausnahmetyp	Bedingung
NotSupportedException	ArrayList ist schreibgeschützt. – oder – ArrayList hat eine feste Größe.

Hinweise

ArrayList akzeptiert NULL (Nothing in Visual Basic) als gültigen Wert und lässt doppelte Elemente zu.

Wenn der Wert von Count bereits gleich der Capacity ist, wird die Kapazität der ArrayList durch automatisches Neureservieren des internen Arrays erhöht, und die vorhandenen Elemente werden in das neue Array kopiert, bevor das neue Element hinzugefügt wird.

Wenn Count kleiner als Capacity ist, ist diese Methode eine O(1)-Operation. Wenn die Kapazität zur Anpassung an das neue Element erhöht werden muss, wird diese Methode zu einer O(n)-Operation, wobei n gleich Count ist.

Beispiel

Im folgenden Codebeispiel wird veranschaulicht, wie ArrayList Elemente hinzugefügt werden.

Imports System
Imports System.Collections
Imports Microsoft.VisualBasic

Public Class SamplesArrayList    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new ArrayList.
        Dim myAL As New ArrayList()
        myAL.Add("The")
        myAL.Add("quick")
        myAL.Add("brown")
        myAL.Add("fox")
        
        ' Creates and initializes a new Queue.
        Dim myQueue As New Queue()
        myQueue.Enqueue("jumped")
        myQueue.Enqueue("over")
        myQueue.Enqueue("the")
        myQueue.Enqueue("lazy")
        myQueue.Enqueue("dog")
        
        ' Displays the ArrayList and the Queue.
        Console.WriteLine("The ArrayList initially contains the following:")
        PrintValues(myAL, ControlChars.Tab)
        Console.WriteLine("The Queue initially contains the following:")
        PrintValues(myQueue, ControlChars.Tab)
        
        ' Copies the Queue elements to the end of the ArrayList.
        myAL.AddRange(myQueue)
        
        ' Displays the ArrayList.
        Console.WriteLine("The ArrayList now contains the following:")
        PrintValues(myAL, ControlChars.Tab)
    End Sub

    Public Shared Sub PrintValues(myList As IEnumerable, mySeparator As Char)
        Dim obj As [Object]
        For Each obj In  myList
          Console.Write( "{0}{1}", mySeparator, obj )
        Next obj
        Console.WriteLine()
    End Sub 'PrintValues

End Class


' This code produces the following output.
' 
' The ArrayList initially contains the following:
'     The    quick    brown    fox
' The Queue initially contains the following:
'     jumped    over    the    lazy    dog
' The ArrayList now contains the following:
'     The    quick    brown    fox    jumped    over    the    lazy    dog 

using System;
using System.Collections;
public class SamplesArrayList  {

   public static void Main()  {

      // Creates and initializes a new ArrayList.
      ArrayList myAL = new ArrayList();
      myAL.Add( "The" );
      myAL.Add( "quick" );
      myAL.Add( "brown" );
      myAL.Add( "fox" );

      // Creates and initializes a new Queue.
      Queue myQueue = new Queue();
      myQueue.Enqueue( "jumped" );
      myQueue.Enqueue( "over" );
      myQueue.Enqueue( "the" );
      myQueue.Enqueue( "lazy" );
      myQueue.Enqueue( "dog" );

      // Displays the ArrayList and the Queue.
      Console.WriteLine( "The ArrayList initially contains the following:" );
      PrintValues( myAL, '\t' );
      Console.WriteLine( "The Queue initially contains the following:" );
      PrintValues( myQueue, '\t' );

      // Copies the Queue elements to the end of the ArrayList.
      myAL.AddRange( myQueue );

      // Displays the ArrayList.
      Console.WriteLine( "The ArrayList now contains the following:" );
      PrintValues( myAL, '\t' );
   }

   public static void PrintValues( IEnumerable myList, char mySeparator )  {
      foreach ( Object obj in myList )
         Console.Write( "{0}{1}", mySeparator, obj );
      Console.WriteLine();
   }

}


/* 
This code produces the following output.

The ArrayList initially contains the following:
    The    quick    brown    fox
The Queue initially contains the following:
    jumped    over    the    lazy    dog
The ArrayList now contains the following:
    The    quick    brown    fox    jumped    over    the    lazy    dog
*/ 

using namespace System;
using namespace System::Collections;
void PrintValues( IEnumerable^ myList, char mySeparator );
int main()
{
   
   // Creates and initializes a new ArrayList.
   ArrayList^ myAL = gcnew ArrayList;
   myAL->Add( "The" );
   myAL->Add( "quick" );
   myAL->Add( "brown" );
   myAL->Add( "fox" );
   
   // Creates and initializes a new Queue.
   Queue^ myQueue = gcnew Queue;
   myQueue->Enqueue( "jumped" );
   myQueue->Enqueue( "over" );
   myQueue->Enqueue( "the" );
   myQueue->Enqueue( "lazy" );
   myQueue->Enqueue( "dog" );
   
   // Displays the ArrayList and the Queue.
   Console::WriteLine( "The ArrayList initially contains the following:" );
   PrintValues( myAL, '\t' );
   Console::WriteLine( "The Queue initially contains the following:" );
   PrintValues( myQueue, '\t' );
   
   // Copies the Queue elements to the end of the ArrayList.
   myAL->AddRange( myQueue );
   
   // Displays the ArrayList.
   Console::WriteLine( "The ArrayList now contains the following:" );
   PrintValues( myAL, '\t' );
}

void PrintValues( IEnumerable^ myList, char mySeparator )
{
   IEnumerator^ myEnum = myList->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Object^ obj = safe_cast<Object^>(myEnum->Current);
      Console::Write( "{0}{1}", mySeparator, obj );
   }

   Console::WriteLine();
}

/* 
This code produces the following output.

The ArrayList initially contains the following:
    The    quick    brown    fox
The Queue initially contains the following:
    jumped    over    the    lazy    dog
The ArrayList now contains the following:
    The    quick    brown    fox    jumped    over    the    lazy    dog
*/

import System.*;
import System.Collections.*;

public class SamplesArrayList
{
    public static void main(String[] args)
    {
        // Creates and initializes a new ArrayList.
        ArrayList myAL = new ArrayList();

        myAL.Add("The");
        myAL.Add("quick");
        myAL.Add("brown");
        myAL.Add("fox");

        // Creates and initializes a new Queue.
        Queue myQueue = new Queue();

        myQueue.Enqueue("jumped");
        myQueue.Enqueue("over");
        myQueue.Enqueue("the");
        myQueue.Enqueue("lazy");
        myQueue.Enqueue("dog");

        // Displays the ArrayList and the Queue.
        Console.WriteLine("The ArrayList initially contains the following:");
        PrintValues(myAL, '\t');
        Console.WriteLine("The Queue initially contains the following:");
        PrintValues(myQueue, '\t');

        // Copies the Queue elements to the end of the ArrayList.
        myAL.AddRange(myQueue);

        // Displays the ArrayList.
        Console.WriteLine("The ArrayList now contains the following:");
        PrintValues(myAL, '\t');
    } //main

    public static void PrintValues(IEnumerable myList, char mySeparator)
    {
        IEnumerator objMyEnum = myList.GetEnumerator();
        while (objMyEnum.MoveNext()) {
            Object obj = objMyEnum.get_Current();
            Console.Write("{0}{1}",(Char)mySeparator, obj);
        }
        Console.WriteLine();
    } //PrintValues
} //SamplesArrayList 

/* 
 This code produces the following output.
 
 The ArrayList initially contains the following:
     The    quick    brown    fox
 The Queue initially contains the following:
     jumped    over    the    lazy    dog
 The ArrayList now contains the following:
     The    quick    brown    fox    jumped    over    the    lazy    dog
 */

import System;
import System.Collections;


// Creates and initializes a new ArrayList.
var myAL : ArrayList = new ArrayList();
myAL.Add( "The" );
myAL.Add( "quick" );
myAL.Add( "brown" );
myAL.Add( "fox" );

// Creates and initializes a new Queue.
var myQueue : Queue  = new Queue();
myQueue.Enqueue( "jumped" );
myQueue.Enqueue( "over" );
myQueue.Enqueue( "the" );
myQueue.Enqueue( "lazy" );
myQueue.Enqueue( "dog" );

// Displays the ArrayList and the Queue.
Console.WriteLine( "The ArrayList initially contains the following:" );
PrintValues( myAL, '\t' );
Console.WriteLine( "The Queue initially contains the following:" );
PrintValues( myQueue, '\t' );

// Copies the Queue elements to the end of the ArrayList.
myAL.AddRange( myQueue );

// Displays the ArrayList.
Console.WriteLine( "The ArrayList now contains the following:" );
PrintValues( myAL, '\t' );

 
function PrintValues( myList : IEnumerable , mySeparator : char  )  {
   var myEnumerator : System.Collections.IEnumerator  = myList.GetEnumerator();
   while ( myEnumerator.MoveNext() )
      Console.Write( "{0}{1}", mySeparator, myEnumerator.Current );
   Console.WriteLine();
}
 /* 
 This code produces the following output.
 
 The ArrayList initially contains the following:
     The    quick    brown    fox
 The Queue initially contains the following:
     jumped    over    the    lazy    dog
 The ArrayList now contains the following:
     The    quick    brown    fox    jumped    over    the    lazy    dog
 */ 

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

.NET Compact Framework

Unterstützt in: 2.0, 1.0

Siehe auch

Referenz

ArrayList-Klasse
ArrayList-Member
System.Collections-Namespace
AddRange
Insert
Remove
Count