Hashtable.CopyTo(Array, Int32) Hashtable.CopyTo(Array, Int32) Hashtable.CopyTo(Array, Int32) Method

Definizione

Copia gli elementi della classe Hashtable gli elementi della classe Array unidimensionale in corrispondenza dell'indice specificato.Copies the Hashtable elements to a one-dimensional Array instance at the specified index.

public:
 virtual void CopyTo(Array ^ array, int arrayIndex);
public virtual void CopyTo (Array array, int arrayIndex);
abstract member CopyTo : Array * int -> unit
override this.CopyTo : Array * int -> unit

Parametri

array
Array Array Array

Oggetto Array unidimensionale che corrisponde alla destinazione degli oggetti DictionaryEntry copiati da Hashtable.The one-dimensional Array that is the destination of the DictionaryEntry objects copied from Hashtable. L'indicizzazione di Array deve essere in base zero.The Array must have zero-based indexing.

arrayIndex
Int32 Int32 Int32

Indice in base zero in array in corrispondenza del quale viene avviata la copia.The zero-based index in array at which copying begins.

Implementazioni

Eccezioni

arrayIndex è minore di zero.arrayIndex is less than zero.

array è multidimensionale.array is multidimensional.

-oppure--or- Il numero di elementi nell'oggetto Hashtable di origine è maggiore dello spazio disponibile tra arrayIndex e la fine dell'oggetto array di destinazione.The number of elements in the source Hashtable is greater than the available space from arrayIndex to the end of the destination array.

Non è possibile eseguire il cast automatico del tipo dell'oggetto Hashtable di origine al tipo dell'oggetto array di destinazione.The type of the source Hashtable cannot be cast automatically to the type of the destination array.

Esempi

Nell'esempio seguente viene illustrato come copiare l'elenco di chiavi o l'elenco di valori in un Hashtable oggetto in un oggetto unidimensionale. ArrayThe following example shows how to copy the list of keys or the list of values in a Hashtable into a one-dimensional Array.

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 ] = "jumps";
   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 jumps over the lazy dog
 After copying the keys, starting at index 6:
  The quick brown fox jumps over B A dog
 After copying the values, starting at index 6:
  The quick brown fox jumps over valueB valueA dog

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

   public static void Main()
   {
      // Creates and initializes the source Hashtable.
      var mySourceHT = new Hashtable();
      mySourceHT.Add("A", "valueA");
      mySourceHT.Add("B", "valueB");

      // Creates and initializes the one-dimensional target Array.
      var myTargetArray = new String[15];
      myTargetArray[0] = "The";
      myTargetArray[1] = "quick";
      myTargetArray[2] = "brown";
      myTargetArray[3] = "fox";
      myTargetArray[4] = "jumps";
      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($"{mySeparator}{myArr[i]}");
      Console.WriteLine();
   }
}
/* 
This code produces the following output.

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

*/ 
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) = "jumps"
        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)
        For i As Integer = 0 To myArr.Length - 1
            Console.Write($"{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 jumps over the lazy dog
' After copying the keys, starting at index 6:
'  The quick brown fox jumps over A B dog
' After copying the values, starting at index 6:
'  The quick brown fox jumps over valueA valueB dog

Commenti

Gli elementi vengono copiati nell' Array oggetto nello stesso ordine in cui l'enumeratore scorre. HashtableThe elements are copied to the Array in the same order in which the enumerator iterates through the Hashtable.

Per copiare solo le chiavi in Hashtable, usare. Hashtable.Keys.CopyToTo copy only the keys in the Hashtable, use Hashtable.Keys.CopyTo.

Per copiare solo i valori in Hashtable, utilizzare. Hashtable.Values.CopyToTo copy only the values in the Hashtable, use Hashtable.Values.CopyTo.

Questo metodo è un'operazione On(), dove n è Count.This method is an O(n) operation, where n is Count.

Si applica a

Vedi anche