Array.Copy 方法

定義

多載

範例

以下程式碼範例說明如何從一個 Array 型別 Object 的整數型複製到另一個 Array 型別。

open System

let printValues (myArr: 'a []) =
    let mutable i = 0;
    let cols = myArr.GetLength(myArr.Rank - 1)
    for item in myArr do
        if i < cols then
            i <- i + 1
        else
            printfn ""
            i <- 1
        printf $"\t{item}"
    printfn ""

 // Creates and initializes a new Array of type int.
let myIntArray = [| 1..5 |]

// Creates and initializes a new Array of type Object.
let myObjArray = Array.init 5 (fun i -> i + 26 :> obj)

// Displays the initial values of both arrays.
printfn "int array:"
printValues myIntArray 
printfn "Object array:"
printValues myObjArray

// Copies the first element from the int array to the Object array.
Array.Copy(myIntArray, myIntArray.GetLowerBound 0, myObjArray, myObjArray.GetLowerBound 0, 1)

// Copies the last two elements from the Object array to the int array.
Array.Copy(myObjArray, myObjArray.GetUpperBound 0 - 1, myIntArray, myIntArray.GetUpperBound 0 - 1, 2)

// Displays the values of the modified arrays.
printfn "int array - Last two elements should now be the same as Object array:"
printValues myIntArray 
printfn "Object array - First element should now be the same as int array:"
printValues myObjArray


// This code produces the following output.
//     int array:
//         1    2    3    4    5
//     Object array:
//         26    27    28    29    30
//     int array - Last two elements should now be the same as Object array:
//         1    2    3    29    30
//     Object array - First element should now be the same as int array:
//         1    27    28    29    30

using System;
public class SamplesArray  {

   public static void Main()  {

      // Creates and initializes a new Array of type int.
      Array myIntArray=Array.CreateInstance( typeof(System.Int32), 5 );
      for ( int i = myIntArray.GetLowerBound(0); i <= myIntArray.GetUpperBound(0); i++ )
         myIntArray.SetValue( i+1, i );

      // Creates and initializes a new Array of type Object.
      Array myObjArray = Array.CreateInstance( typeof(System.Object), 5 );
      for ( int i = myObjArray.GetLowerBound(0); i <= myObjArray.GetUpperBound(0); i++ )
         myObjArray.SetValue( i+26, i );

      // Displays the initial values of both arrays.
      Console.WriteLine( "int array:" );
      PrintValues( myIntArray );
      Console.WriteLine( "Object array:" );
      PrintValues( myObjArray );

      // Copies the first element from the int array to the Object array.
      Array.Copy( myIntArray, myIntArray.GetLowerBound(0), myObjArray, myObjArray.GetLowerBound(0), 1 );

      // Copies the last two elements from the Object array to the int array.
      Array.Copy( myObjArray, myObjArray.GetUpperBound(0) - 1, myIntArray, myIntArray.GetUpperBound(0) - 1, 2 );

      // Displays the values of the modified arrays.
      Console.WriteLine( "int array - Last two elements should now be the same as Object array:" );
      PrintValues( myIntArray );
      Console.WriteLine( "Object array - First element should now be the same as int array:" );
      PrintValues( myObjArray );
   }

   public static void PrintValues( Array myArr )  {
      System.Collections.IEnumerator myEnumerator = myArr.GetEnumerator();
      int i = 0;
      int cols = myArr.GetLength( myArr.Rank - 1 );
      while ( myEnumerator.MoveNext() )  {
         if ( i < cols )  {
            i++;
         } else  {
            Console.WriteLine();
            i = 1;
         }
         Console.Write( "\t{0}", myEnumerator.Current );
      }
      Console.WriteLine();
   }
}
/*
This code produces the following output.

int array:
    1    2    3    4    5
Object array:
    26    27    28    29    30
int array - Last two elements should now be the same as Object array:
    1    2    3    29    30
Object array - First element should now be the same as int array:
    1    27    28    29    30
*/

Public Class SamplesArray    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new Array of type Int32.
        Dim myIntArray As Array = _
           Array.CreateInstance(GetType(System.Int32), 5)
        Dim i As Integer
        For i = myIntArray.GetLowerBound(0) To myIntArray.GetUpperBound(0)
            myIntArray.SetValue(i + 1, i)
        Next i 
        ' Creates and initializes a new Array of type Object.
        Dim myObjArray As Array = _
           Array.CreateInstance(GetType(System.Object), 5)
        For i = myObjArray.GetLowerBound(0) To myObjArray.GetUpperBound(0)
            myObjArray.SetValue(i + 26, i)
        Next i 
        ' Displays the initial values of both arrays.
        Console.WriteLine("Int32 array:")
        PrintValues(myIntArray)
        Console.WriteLine("Object array:")
        PrintValues(myObjArray)
        
        ' Copies the first element from the Int32 array to the Object array.
        Array.Copy(myIntArray, myIntArray.GetLowerBound(0), myObjArray, _
           myObjArray.GetLowerBound(0), 1)
        
        ' Copies the last two elements from the Object array to the Int32 array.
        Array.Copy(myObjArray, myObjArray.GetUpperBound(0) - 1, myIntArray, _
           myIntArray.GetUpperBound(0) - 1, 2)
        
        ' Displays the values of the modified arrays.
        Console.WriteLine("Int32 array - Last two elements should now be " _
           + "the same as Object array:")
        PrintValues(myIntArray)
        Console.WriteLine("Object array - First element should now be the " _
           + "same as Int32 array:")
        PrintValues(myObjArray)
    End Sub
    
    Public Shared Sub PrintValues(myArr As Array)
        Dim myEnumerator As System.Collections.IEnumerator = _
           myArr.GetEnumerator()
        Dim i As Integer = 0
        Dim cols As Integer = myArr.GetLength((myArr.Rank - 1))
        While myEnumerator.MoveNext()
            If i < cols Then
                i += 1
            Else
                Console.WriteLine()
                i = 1
            End If
            Console.Write(ControlChars.Tab + "{0}", myEnumerator.Current)
        End While
        Console.WriteLine()
    End Sub
End Class

' This code produces the following output.
' 
' Int32 array:
'     1    2    3    4    5
' Object array:
'     26    27    28    29    30
' Int32 array - Last two elements should now be the same as Object array:
'     1    2    3    29    30
' Object array - First element should now be the same as Int32 array:
'     1    27    28    29    30

public:
 static void Copy(Array ^ sourceArray, long sourceIndex, Array ^ destinationArray, long destinationIndex, long length);

public static void Copy(Array sourceArray, long sourceIndex, Array destinationArray, long destinationIndex, long length);

static member Copy : Array * int64 * Array * int64 * int64 -> unit

Public Shared Sub Copy (sourceArray As Array, sourceIndex As Long, destinationArray As Array, destinationIndex As Long, length As Long)

public:
 static void Copy(Array ^ sourceArray, int sourceIndex, Array ^ destinationArray, int destinationIndex, int length);

public static void Copy(Array sourceArray, int sourceIndex, Array destinationArray, int destinationIndex, int length);

static member Copy : Array * int * Array * int * int -> unit

Public Shared Sub Copy (sourceArray As Array, sourceIndex As Integer, destinationArray As Array, destinationIndex As Integer, length As Integer)

public:
 static void Copy(Array ^ sourceArray, Array ^ destinationArray, int length);

public static void Copy(Array sourceArray, Array destinationArray, int length);

static member Copy : Array * Array * int -> unit

Public Shared Sub Copy (sourceArray As Array, destinationArray As Array, length As Integer)

public:
 static void Copy(Array ^ sourceArray, Array ^ destinationArray, long length);

public static void Copy(Array sourceArray, Array destinationArray, long length);

static member Copy : Array * Array * int64 -> unit

Public Shared Sub Copy (sourceArray As Array, destinationArray As Array, length As Long)