.NET Framework Class Library
CollectionTCopyTo Method

Copies the entire CollectionT to a compatible one-dimensional Array, starting at the specified index of the target array.

Namespace:   System.Collections.ObjectModel
Assembly:  mscorlib (in mscorlib.dll)
Public Sub CopyTo ( _
	array As T(), _
	index As [%$TOPIC/ms132408_en-us_VS_110_3_0_0_0_0%] _
public void CopyTo(
	T[] array,
	[%$TOPIC/ms132408_en-us_VS_110_3_0_1_0_0%] index
virtual void CopyTo(
	array<T>^ array, 
	[%$TOPIC/ms132408_en-us_VS_110_3_0_2_0_0%] index
) sealed
abstract CopyTo : 
        array:'T[] * 
        index:[%$TOPIC/ms132408_en-us_VS_110_3_0_3_0_0%] -> unit  
override CopyTo : 
        array:'T[] * 
        index:[%$TOPIC/ms132408_en-us_VS_110_3_0_3_0_1%] -> unit


Type: T

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

Type: SystemInt32

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


ICollectionTCopyTo(T, Int32)

array is .


index is less than zero.


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


This method uses ArrayCopy to copy the elements.

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

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

Version Information

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, 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.