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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)

abstract CopyTo : 
        index:int * 
        array:Array * 
        arrayIndex:int * 
        count:int -> unit 
override CopyTo : 
        index:int * 
        array:Array * 
        arrayIndex:int * 
        count:int -> unit 


Type: System.Int32
The zero-based index in the source ArrayList at which copying begins.
Type: System.Array
The one-dimensional Array that is the destination of the elements copied from ArrayList. The Array must have zero-based indexing.
Type: System.Int32
The zero-based index in array at which copying begins.
Type: System.Int32
The number of elements to copy.


array is a null reference (Nothing in Visual Basic).


index is less than zero.


arrayIndex is less than zero.


count is less than zero.


array is multidimensional.


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


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.


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.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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