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ArrayList.CopyTo Method (Int32, Array, Int32, Int32)

Copies a range of elements from the ArrayList to a compatible one-dimensional Array, starting at the specified index of the target array.

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

'Declaration
Public Overridable Sub CopyTo ( _
	index As Integer, _
	array As Array, _
	arrayIndex As Integer, _
	count As Integer _
)

Parameters

index
Type: System.Int32

The zero-based index in the source ArrayList at which copying begins.

array
Type: System.Array

The one-dimensional Array that is the destination of the elements copied from ArrayList. The Array must have zero-based indexing.

arrayIndex
Type: System.Int32

The zero-based index in array at which copying begins.

count
Type: System.Int32

The number of elements to copy.

ExceptionCondition
ArgumentNullException

array is Nothing.

ArgumentOutOfRangeException

index is less than zero.

-or-

arrayIndex is less than zero.

-or-

count is less than zero.

ArgumentException

array is multidimensional.

-or-

index is equal to or greater than the Count of the source ArrayList.

-or-

The number of elements from index to the end of the source ArrayList is greater than the available space from arrayIndex to the end of the destination array.

InvalidCastException

The type of the source ArrayList cannot be cast automatically to the type of the destination array.

The specified array must be of a compatible type.

This method uses Array.Copy to copy the elements.

The elements are copied to the Array in the same order in which the enumerator iterates through the ArrayList.

This method is an O(n) operation, where n is count.

The following code example shows how to copy an ArrayList into a one-dimensional System.Array.

Imports System
Imports System.Collections

Public Class SamplesArrayList

    Public Shared Sub Main()

        ' Creates and initializes the source ArrayList. 
        Dim mySourceList As New ArrayList()
        mySourceList.Add("three")
        mySourceList.Add("napping")
        mySourceList.Add("cats")
        mySourceList.Add("in")
        mySourceList.Add("the")
        mySourceList.Add("barn")

        ' Creates and initializes the one-dimensional target Array. 
        Dim myTargetArray(14) As String
        myTargetArray(0) = "The"
        myTargetArray(1) = "quick"
        myTargetArray(2) = "brown"
        myTargetArray(3) = "fox"
        myTargetArray(4) = "jumped"
        myTargetArray(5) = "over"
        myTargetArray(6) = "the"
        myTargetArray(7) = "lazy"
        myTargetArray(8) = "dog" 

        ' Displays the values of the target Array.
        Console.WriteLine("The target Array contains the following (before and after copying):")
        PrintValues(myTargetArray, " "c)

        ' Copies the second element from the source ArrayList to the target Array, starting at index 7.
        mySourceList.CopyTo(1, myTargetArray, 7, 1)

        ' Displays the values of the target Array.
        PrintValues(myTargetArray, " "c)

        ' Copies the entire source ArrayList to the target Array, starting at index 6.
        mySourceList.CopyTo(myTargetArray, 6)

        ' Displays the values of the target Array.
        PrintValues(myTargetArray, " "c)

        ' Copies the entire source ArrayList to the target Array, starting at index 0.
        mySourceList.CopyTo(myTargetArray)

        ' Displays the values of the target Array.
        PrintValues(myTargetArray, " "c)

    End Sub 'Main

    Public Shared Sub PrintValues(myArr() As String, mySeparator As Char)
        Dim i As Integer 
        For i = 0 To myArr.Length - 1
            Console.Write("{0}{1}", mySeparator, myArr(i))
        Next i
        Console.WriteLine()
    End Sub 'PrintValues

End Class 'SamplesArrayList 


' This code produces the following output. 
'  
' The target Array contains the following (before and after copying): 
'  The quick brown fox jumped over the lazy dog 
'  The quick brown fox jumped over the napping dog 
'  The quick brown fox jumped over three napping cats in the barn 
'  three napping cats in the barn three napping cats in the barn

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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