Array.Clone メソッドとは？ わかりやすく解説

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Array.Clone メソッド

Array の簡易コピーを作成します。

名前空間: System
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

Visual Basic (宣言)
Public Function Clone As
 Object
Visual Basic (使用法)
Dim instance As Array
Dim returnValue As Object

returnValue = instance.Clone
C#
public Object Clone ()
C++
public:
virtual Object^ Clone () sealed
J#
public final Object Clone ()
JScript
public final function Clone () : Object

戻り値
Array の簡易コピー。

解説解説

Array の簡易コピーでは、要素が参照型であるか値型であるかに関係なく、その Array の要素だけがコピーされ、それらの参照が指している先のオブジェクトはコピーされません。新しい Array 内の参照は、元の Array 内の参照と同じオブジェクトを指します。

対照的に、Array の詳細コピーでは、要素自体および要素が直接的または間接的に参照するすべての対象がコピーされます。

クローンは、元の Array と同じ Type です。

このメソッドは O(n) 操作です。ここで、n は Length です。

使用例使用例

次のコード例では、System.Globalization.CultureInfo 配列の複製を作成し、簡易コピーの動作をデモンストレーションします。

Visual Basic
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 -.
C#
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
 -.

*/
C++
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
 -.

*/
J#
import System.*;
import System.Globalization.*;

public class SamplesArray
{
    public static void main(String[]
 args)
    {
        // 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.set_Item(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].get_Name()
,
            arrCI[3].get_DateTimeFormat().get_DateSeparator());
        Console.WriteLine("      Clone: The DateTimeFormatInfo.DateSeparator
 " 
            + "for {0} is {1}.", arrCIClone[3].get_Name()
,
            arrCIClone[3].get_DateTimeFormat().get_DateSeparator());
        // Replace the DateTimeFormatInfo.DateSeparator for the fourth
 element
        // in the clone array.
        arrCIClone[3].get_DateTimeFormat().set_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].get_Name()
,
            arrCI[3].get_DateTimeFormat().get_DateSeparator());
        Console.WriteLine("      Clone: The DateTimeFormatInfo.DateSeparator
 " 
            + "for {0} is {1}.", arrCIClone[3].get_Name()
,
            arrCIClone[3].get_DateTimeFormat().get_DateSeparator());
    } //main

    public static void PrintIndexAndValues(Array
 myArray)
    {
        for (int i = myArray.GetLowerBound(0);
            i <= myArray.GetUpperBound(0); i++) {
            Console.WriteLine("\t[{0}]:\t{1}", System.Convert.ToString(i)
,
                myArray.GetValue(i));
        }
    } //PrintIndexAndValues 
} //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 -.
*/
プラットフォームプラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0
参照参照
関連項目
Array クラス
Array メンバ
System 名前空間
Copy
ConstrainedCopy

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Array.Clone メソッドのお隣キーワード

ArrangedElementCollection.System.Collections.IList.Item プロパティ

ArrangedElementCollection.System.Collections.IList.Remove メソッド

ArrangedElementCollection.System.Collections.IList.RemoveAt メソッド

Array.AsReadOnly ジェネリック メソッド

Array.BinarySearch メソッド

Array.Clear メソッド

Array.Clone メソッド

Array.ConstrainedCopy メソッド

Array.ConvertAll ジェネリック メソッド

Array.Copy メソッド

Array.CopyTo メソッド

ArrayConstructor クラス

ArrayConstructor フィールド

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