Array.Clone Méthode

Définition

Crée une copie superficielle de Array.Creates a shallow copy of the Array.

public:
 System::Object ^ Clone();
public:
 virtual System::Object ^ Clone();
public object Clone ();
public virtual object Clone ();
member this.Clone : unit -> obj
abstract member Clone : unit -> obj
override this.Clone : unit -> obj
Public Function Clone () As Object
Public Overridable Function Clone () As Object

Retours

Object

Copie superficielle de Array.A shallow copy of the Array.

Implémente

Exemples

L’exemple de code suivant clone un System.Globalization.CultureInfo tableau et illustre le comportement d’une copie superficielle.The following code example clones a System.Globalization.CultureInfo array and demonstrates the behavior of a shallow copy.

using namespace System;
using namespace System::Globalization;
void PrintIndexAndValues( Array^ myArray );
int main()
{
   
   // Create and initialize a new CultureInfo array.
   CultureInfo^ ci0 = gcnew CultureInfo( "ar-SA",false );
   CultureInfo^ ci1 = gcnew CultureInfo( "en-US",false );
   CultureInfo^ ci2 = gcnew CultureInfo( "fr-FR",false );
   CultureInfo^ ci3 = gcnew CultureInfo( "ja-JP",false );
   array<CultureInfo^>^arrCI = {ci0,ci1,ci2,ci3};
   
   // Create a clone of the CultureInfo array.
   array<CultureInfo^>^arrCIClone = (array<CultureInfo^>^)arrCI->Clone();
   
   // Replace an element in the clone array.
   CultureInfo^ ci4 = gcnew 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 );
}

void PrintIndexAndValues( Array^ myArray )
{
   for ( int i = myArray->GetLowerBound( 0 ); i <= myArray->GetUpperBound( 0 ); i++ )
      Console::WriteLine( "\t[{0}]:\t{1}", i, myArray->GetValue( i ) );
}

/* 
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 -.

*/
using System;
using System.Globalization;
public class SamplesArray  {

   public static void Main()  {

      // Create and initialize a new CultureInfo array.
      CultureInfo ci0 = new CultureInfo( "ar-SA", false );
      CultureInfo ci1 = new CultureInfo( "en-US", false );
      CultureInfo ci2 = new CultureInfo( "fr-FR", false );
      CultureInfo ci3 = new CultureInfo( "ja-JP", false );
      CultureInfo[] arrCI = new CultureInfo[] { ci0, ci1, ci2, ci3 };

      // Create a clone of the CultureInfo array.
      CultureInfo[] arrCIClone = (CultureInfo[]) arrCI.Clone();

      // Replace an element in the clone array.
      CultureInfo ci4 = 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 );
   }

   public static void PrintIndexAndValues( Array myArray )  {
      for ( int i = myArray.GetLowerBound(0); i <= myArray.GetUpperBound(0); i++ )
         Console.WriteLine( "\t[{0}]:\t{1}", i, myArray.GetValue( i ) );
   }
}


/*
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 -.

*/
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

    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

End Class


'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 -.

Remarques

Une copie superficielle d’un objet Array copie uniquement les éléments de Array , qu’il s’agisse de types référence ou de types valeur, mais ne copie pas les objets auxquels les références font référence.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. Les références dans le nouveau Array pointent vers les mêmes objets que les références du point d’origine Array .The references in the new Array point to the same objects that the references in the original Array point to.

En revanche, une copie complète d’un Array copie les éléments et tout ce qui est directement ou indirectement référencé par les éléments.In contrast, a deep copy of an Array copies the elements and everything directly or indirectly referenced by the elements.

Le clone est identique Type à l’original Array .The clone is of the same Type as the original Array.

Cette méthode est une opération O ( n ), où n est Length .This method is an O(n) operation, where n is Length.

S’applique à

Voir aussi