Array.Clone Method

Creates a shallow copy of the Array.

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

'Declaration
Public Function Clone As Object

Return Value

Type: System.Object
A shallow copy of the Array.

Implements

ICloneable.Clone

A shallow copy of an Array copies only the elements of the Array, whether they are reference types or value types, but it does not copy the objects that the references refer to. The references in the new Array point to the same objects that the references in the original Array point to.

In contrast, a deep copy of an Array copies the elements and everything directly or indirectly referenced by the elements.

The clone is of the same Type as the original Array.

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

The following code example clones a System.Globalization.CultureInfo array and demonstrates the behavior of a shallow copy.

Imports System
Imports System.Globalization

Public Class SamplesArray

    Public Shared Sub Main()

        ' Create and initialize a new CultureInfo array. 
        Dim ci0 As New CultureInfo("ar-SA", False)
        Dim ci1 As New CultureInfo("en-US", False)
        Dim ci2 As New CultureInfo("fr-FR", False)
        Dim ci3 As New CultureInfo("ja-JP", False)
        Dim arrCI() As CultureInfo = {ci0, ci1, ci2, ci3}

        ' Create a clone of the CultureInfo array. 
        Dim arrCIClone As CultureInfo() = CType(arrCI.Clone(), CultureInfo())

        ' Replace an element in the clone array. 
        Dim ci4 As New CultureInfo("th-TH", False)
        arrCIClone(0) = ci4

        ' Display the contents of the original array.
        Console.WriteLine("The original array contains the following values:")
        PrintIndexAndValues(arrCI)

        ' Display the contents of the clone array.
        Console.WriteLine("The clone array contains the following values:")
        PrintIndexAndValues(arrCIClone)

        ' Display the DateTimeFormatInfo.DateSeparator for the fourth element in both arrays.
        Console.WriteLine("Before changes to the clone:")
        Console.WriteLine("   Original: The DateTimeFormatInfo.DateSeparator for {0} is {1}.", arrCI(3).Name, arrCI(3).DateTimeFormat.DateSeparator)
        Console.WriteLine("      Clone: The DateTimeFormatInfo.DateSeparator for {0} is {1}.", arrCIClone(3).Name, arrCIClone(3).DateTimeFormat.DateSeparator)

        ' Replace the DateTimeFormatInfo.DateSeparator for the fourth element in the clone array.
        arrCIClone(3).DateTimeFormat.DateSeparator = "-" 

        ' Display the DateTimeFormatInfo.DateSeparator for the fourth element in both arrays.
        Console.WriteLine("After changes to the clone:")
        Console.WriteLine("   Original: The DateTimeFormatInfo.DateSeparator for {0} is {1}.", arrCI(3).Name, arrCI(3).DateTimeFormat.DateSeparator)
        Console.WriteLine("      Clone: The DateTimeFormatInfo.DateSeparator for {0} is {1}.", arrCIClone(3).Name, arrCIClone(3).DateTimeFormat.DateSeparator)

    End Sub 'Main

    Public Shared Sub PrintIndexAndValues(myArray As Array)
        Dim i As Integer 
        For i = myArray.GetLowerBound(0) To myArray.GetUpperBound(0)
            Console.WriteLine(vbTab + "[{0}]:" + vbTab + "{1}", i, myArray.GetValue(i))
        Next i
    End Sub 'PrintIndexAndValues 

End Class 'SamplesArray


'This code produces the following output. 

'The original array contains the following values: 
'        [0]:    ar-SA 
'        [1]:    en-US 
'        [2]:    fr-FR 
'        [3]:    ja-JP 
'The clone array contains the following values: 
'        [0]:    th-TH 
'        [1]:    en-US 
'        [2]:    fr-FR 
'        [3]:    ja-JP 
'Before changes to the clone: 
'   Original: The DateTimeFormatInfo.DateSeparator for ja-JP is /. 
'      Clone: The DateTimeFormatInfo.DateSeparator for ja-JP is /. 
'After changes to the clone: 
'   Original: The DateTimeFormatInfo.DateSeparator for ja-JP is -. 
'      Clone: The DateTimeFormatInfo.DateSeparator for ja-JP is -.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2015 Microsoft