Hashtable.CopyTo メソッドとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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Hashtable.CopyTo メソッド

1 次元の Array インスタンスの指定したインデックスに Hashtable の要素をコピーします。

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

Visual Basic (宣言)

Public Overridable Sub CopyTo
 ( _
    array As Array, _
    arrayIndex As Integer _
)

Visual Basic (使用法)

Dim instance As Hashtable
Dim array As Array
Dim arrayIndex As Integer

instance.CopyTo(array, arrayIndex)

public virtual void CopyTo (
    Array array,
    int arrayIndex
)

C++

public:
virtual void CopyTo (
    Array^ array, 
    int arrayIndex
)

public void CopyTo (
    Array array, 
    int arrayIndex
)

JScript

public function CopyTo (
    array : Array, 
    arrayIndex : int
)

パラメータ

array: Hashtable から DictionaryEntry オブジェクトがコピーされる 1 次元の Array。Array には、0 から始まるインデックス番号が必要です。

arrayIndex: コピーの開始位置となる、array の 0 から始まるインデックス番号。

例外

例外の種類	条件
ArgumentNullException	array が null 参照 (Visual Basic では Nothing) です。
ArgumentOutOfRangeException	arrayIndex が 0 未満です。
ArgumentException	array が多次元です。または arrayIndex が array の長さ以上です。またはコピー元の Hashtable の要素数が、arrayIndex からコピー先の array の末尾までに格納できる数を超えています。
InvalidCastException	コピー元の Hashtable の型が、コピー先の array の型に自動的にキャストできません。

解説

要素は、列挙子が Hashtable を反復処理するのと同じ順序で、Array にコピーされます。

Hashtable 内のキーだけをコピーするには、Hashtable.Keys.CopyTo を使用します。

Hashtable 内の値だけをコピーするには、Hashtable.Values.CopyTo を使用します。

このメソッドは O(n) 操作です。ここで、n は Count です。

使用例

1 次元の Array に Hashtable 内のキーまたは値のリストをコピーする方法の例を次に示します。

Visual Basic

Imports System
Imports System.Collections

Public Class SamplesHashtable

    Public Shared Sub Main()

        ' Creates and initializes the source Hashtable.
        Dim mySourceHT As New
 Hashtable()
        mySourceHT.Add("A", "valueA")
        mySourceHT.Add("B", "valueB")

        ' Creates and initializes the one-dimensional target Array.
        Dim myTargetArray(14) As String
        myTargetArray(0) = "The"
        myTargetArray(1) = "quick"
        myTargetArray(2) = "brown"
        myTargetArray(3) = "fox"
        myTargetArray(4) = "jumped"
        myTargetArray(5) = "over"
        myTargetArray(6) = "the"
        myTargetArray(7) = "lazy"
        myTargetArray(8) = "dog"

        ' Displays the values of the target Array.
        Console.WriteLine("The target Array contains the following
 before:")
        PrintValues(myTargetArray, " "c)

        ' Copies the keys in the source Hashtable to the target Hashtable,
 starting at index 6.
        Console.WriteLine("After copying the keys, starting at
 index 6:")
        mySourceHT.Keys.CopyTo(myTargetArray, 6)

        ' Displays the values of the target Array.
        PrintValues(myTargetArray, " "c)

        ' Copies the values in the source Hashtable to the target Hashtable,
 starting at index 6.
        Console.WriteLine("After copying the values, starting
 at index 6:")
        mySourceHT.Values.CopyTo(myTargetArray, 6)

        ' Displays the values of the target Array.
        PrintValues(myTargetArray, " "c)

    End Sub 'Main

    Public Shared Sub PrintValues(myArr()
 As String, mySeparator As
 Char)
        Dim i As Integer
        For i = 0 To myArr.Length - 1
            Console.Write("{0}{1}", mySeparator, myArr(i))
        Next i
        Console.WriteLine()
    End Sub 'PrintValues

End Class 'SamplesHashtable


' This code produces the following output.
' 
' The target Array contains the following before:
'  The quick brown fox jumped over the lazy dog
' After copying the keys, starting at index 6:
'  The quick brown fox jumped over B A dog
' After copying the values, starting at index 6:
'  The quick brown fox jumped over valueB valueA dog

using System;
using System.Collections;
public class SamplesHashtable  {

   public static void Main()
  {

      // Creates and initializes the source Hashtable.
      Hashtable mySourceHT = new Hashtable();
      mySourceHT.Add( "A", "valueA" );
      mySourceHT.Add( "B", "valueB" );

      // Creates and initializes the one-dimensional target Array.
      String[] myTargetArray = new String[15];
      myTargetArray[0] = "The";
      myTargetArray[1] = "quick";
      myTargetArray[2] = "brown";
      myTargetArray[3] = "fox";
      myTargetArray[4] = "jumped";
      myTargetArray[5] = "over";
      myTargetArray[6] = "the";
      myTargetArray[7] = "lazy";
      myTargetArray[8] = "dog";

      // Displays the values of the target Array.
      Console.WriteLine( "The target Array contains the following before:"
 );
      PrintValues( myTargetArray, ' ' );

      // Copies the keys in the source Hashtable to the target Hashtable,
 starting at index 6.
      Console.WriteLine( "After copying the keys, starting at index 6:"
 );
      mySourceHT.Keys.CopyTo( myTargetArray, 6 );

      // Displays the values of the target Array.
      PrintValues( myTargetArray, ' ' );

      // Copies the values in the source Hashtable to the target Hashtable,
 starting at index 6.
      Console.WriteLine( "After copying the values, starting at index 6:"
 );
      mySourceHT.Values.CopyTo( myTargetArray, 6 );

      // Displays the values of the target Array.
      PrintValues( myTargetArray, ' ' );
   }

   public static void PrintValues(
 String[] myArr, char mySeparator )  {
      for ( int i = 0; i < myArr.Length;
 i++ )
         Console.Write( "{0}{1}", mySeparator, myArr[i] );
      Console.WriteLine();
   }
}
/* 
This code produces the following output.

The target Array contains the following before:
 The quick brown fox jumped over the lazy dog
After copying the keys, starting at index 6:
 The quick brown fox jumped over B A dog
After copying the values, starting at index 6:
 The quick brown fox jumped over valueB valueA dog

*/

C++

using namespace System;
using namespace System::Collections;
void PrintValues( array<String^>^myArr, char
 mySeparator );
int main()
{
   
   // Creates and initializes the source Hashtable.
   Hashtable^ mySourceHT = gcnew Hashtable;
   mySourceHT->Add( "A", "valueA" );
   mySourceHT->Add( "B", "valueB" );
   
   // Creates and initializes the one-dimensional target Array.
   array<String^>^myTargetArray = gcnew array<String^>(15);
   myTargetArray[ 0 ] = "The";
   myTargetArray[ 1 ] = "quick";
   myTargetArray[ 2 ] = "brown";
   myTargetArray[ 3 ] = "fox";
   myTargetArray[ 4 ] = "jumped";
   myTargetArray[ 5 ] = "over";
   myTargetArray[ 6 ] = "the";
   myTargetArray[ 7 ] = "lazy";
   myTargetArray[ 8 ] = "dog";
   
   // Displays the values of the target Array.
   Console::WriteLine( "The target Array contains the following before:"
 );
   PrintValues( myTargetArray, ' ' );
   
   // Copies the keys in the source Hashtable to the target Hashtable,
 starting at index 6.
   Console::WriteLine( "After copying the keys, starting at index 6:" );
   mySourceHT->Keys->CopyTo( myTargetArray, 6 );
   
   // Displays the values of the target Array.
   PrintValues( myTargetArray, ' ' );
   
   // Copies the values in the source Hashtable to the target Hashtable,
 starting at index 6.
   Console::WriteLine( "After copying the values, starting at index 6:"
 );
   mySourceHT->Values->CopyTo( myTargetArray, 6 );
   
   // Displays the values of the target Array.
   PrintValues( myTargetArray, ' ' );
}

void PrintValues( array<String^>^myArr, char
 mySeparator )
{
   for ( int i = 0; i < myArr->Length;
 i++ )
      Console::Write( "{0}{1}", mySeparator, myArr[ i ] );
   Console::WriteLine();
}

/* 
 This code produces the following output.
 
 The target Array contains the following before:
  The quick brown fox jumped over the lazy dog
 After copying the keys, starting at index 6:
  The quick brown fox jumped over B A dog
 After copying the values, starting at index 6:
  The quick brown fox jumped over valueB valueA dog

 */

import System.*;
import System.Collections.*;

public class SamplesHashtable
{
    public static void main(String[]
 args)
    {
        // Creates and initializes the source Hashtable.
        Hashtable mySourceHT = new Hashtable();

        mySourceHT.Add("A", "valueA");
        mySourceHT.Add("B", "valueB");

        // Creates and initializes the one-dimensional target Array.
        String myTargetArray[] = new String[15];

        myTargetArray.set_Item(0, "The");
        myTargetArray.set_Item(1, "quick");
        myTargetArray.set_Item(2, "brown");
        myTargetArray.set_Item(3, "fox");
        myTargetArray.set_Item(4, "jumped");
        myTargetArray.set_Item(5, "over");
        myTargetArray.set_Item(6, "the");
        myTargetArray.set_Item(7, "lazy");
        myTargetArray.set_Item(8, "dog");

        // Displays the values of the target Array.
        Console.WriteLine("The target Array contains the following before:");
        PrintValues(myTargetArray, ' ');

        // Copies the keys in the source Hashtable to the target Hashtable,
 
        // starting at index 6.
        Console.WriteLine("After copying the keys, starting at index 6:");
        mySourceHT.get_Keys().CopyTo(myTargetArray, 6);

        // Displays the values of the target Array.
        PrintValues(myTargetArray, ' ');

        // Copies the values in the source Hashtable to the target Hashtable,
 
        // starting at index 6.
        Console.WriteLine("After copying the values, starting at index 6:");
        mySourceHT.get_Values().CopyTo(myTargetArray, 6);

        // Displays the values of the target Array.
        PrintValues(myTargetArray, ' ');
    } //main

    public static void PrintValues(String
 myArr[], char mySeparator)
    {
        for (int i = 0; i < myArr.length;
 i++) {
            Console.Write("{0}{1}", System.Convert.ToString(mySeparator),
 
                myArr.get_Item(i));
        }
        Console.WriteLine();
    } //PrintValues
} //SamplesHashtable
/* 
 This code produces the following output.
 
 The target Array contains the following before:
  The quick brown fox jumped over the lazy dog
 After copying the keys, starting at index 6:
  The quick brown fox jumped over B A dog
 After copying the values, starting at index 6:
  The quick brown fox jumped over valueB valueA dog
 */

JScript

import System
import System.Collections

// Creates and initializes the source Hashtable.
var mySourceHT : Hashtable = new Hashtable()
mySourceHT.Add("A", "valueA")
mySourceHT.Add("B", "valueB")

// Creates and initializes the one-dimensional target Array.
var myTargetArray : System.Array = System.Array.CreateInstance(System.String,
 15)
myTargetArray.SetValue("The", 0)
myTargetArray.SetValue("quick", 1)
myTargetArray.SetValue("brown", 2)
myTargetArray.SetValue("fox", 3)
myTargetArray.SetValue("jumped", 4)
myTargetArray.SetValue("over", 5)
myTargetArray.SetValue("the", 6)
myTargetArray.SetValue("lazy", 7)
myTargetArray.SetValue("dog", 8)

// Displays the values of the target Array.
Console.WriteLine("The target Array contains the following before:")
PrintValues(myTargetArray, " ")

// Copies the keys in the source Hashtable to the target Hashtable,
// starting at index 6.
Console.WriteLine("After copying the keys, starting at index 6:")
mySourceHT.Keys.CopyTo(myTargetArray, 6)

// Displays the values of the target Array.
PrintValues(myTargetArray, " ")

// Copies the values in the source Hashtable to the target Hashtable
,
// starting at index 6.
Console.WriteLine("After copying the values, starting at index 6:")
mySourceHT.Values.CopyTo(myTargetArray, 6)

// Displays the values of the target Array.
PrintValues(myTargetArray, " ")

function PrintValues(myArr : System.Array, mySeparator : Char){
    var myEnumerator : System.Collections.IEnumerator = myArr.GetEnumerator()
    var i : int = 0
    var cols : int = myArr.GetLength(myArr.Rank
 - 1)
    while(myEnumerator.MoveNext()){
        if(i < cols)
            i++
        else{
            Console.WriteLine()
            i = 1
        }
        Console.Write("{0}{1}", mySeparator, myEnumerator.Current)
    }
    Console.WriteLine()
}

// This code produces the following output.
// 
// The target Array contains the following before:
//  The quick brown fox jumped over the lazy dog
// After copying the keys, starting at index 6:
//  The quick brown fox jumped over A B dog
// After copying the values, starting at index 6:
//  The quick brown fox jumped over valueA valueB dog

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

.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

関連項目
Hashtable クラス
Hashtable メンバ
System.Collections 名前空間
Array クラス
DictionaryEntry 構造体
GetEnumerator

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Hashtable.CopyTo メソッドとは？ わかりやすく解説

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Hashtable.CopyTo メソッドとは？わかりやすく解説