Buffer.BlockCopy(Array, Int32, Array, Int32, Int32) Metode
Definisi
Penting
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Menyalin jumlah byte tertentu dari array sumber yang dimulai pada offset tertentu ke array tujuan yang dimulai pada offset tertentu.
public:
static void BlockCopy(Array ^ src, int srcOffset, Array ^ dst, int dstOffset, int count);public static void BlockCopy(Array src, int srcOffset, Array dst, int dstOffset, int count);static member BlockCopy : Array * int * Array * int * int -> unitPublic Shared Sub BlockCopy (src As Array, srcOffset As Integer, dst As Array, dstOffset As Integer, count As Integer)Parameter
- src
- Array
Buffer sumber.
- srcOffset
- Int32
Offset byte berbasis nol ke dalam src.
- dst
- Array
Buffer tujuan.
- dstOffset
- Int32
Offset byte berbasis nol ke dalam dst.
- count
- Int32
Jumlah byte yang akan disalin.
Pengecualian
src atau dst adalah null.
src atau dst bukan array primitif.
-atau-
Jumlah byte di src kurang dari srcOffset plus count.
-atau-
Jumlah byte di dst kurang dari dstOffset plus count.
srcOffset, dstOffset, atau count kurang dari 0.
Contoh
Contoh berikut menyalin wilayah array dengan menggunakan BlockCopy metode . Untuk setiap BlockCopy operasi, ini mencantumkan array sumber dan tujuan sebagai array nilai dan sebagai urutan byte. Contoh ini menggambarkan pentingnya mempertimbangkan endianness sistem saat bekerja dengan metode BlockCopy: Karena sistem Windows adalah little-endian, byte urutan bawah dari nilai jenis data primitif mendahului byte urutan yang lebih tinggi.
using System;
class Example
{
// Display the individual bytes in the array in hexadecimal.
public static void DisplayArray(Array arr, string name)
{
Console.WindowWidth = 120;
Console.Write("{0,11}:", name);
for (int ctr = 0; ctr < arr.Length; ctr++)
{
byte[] bytes;
if (arr is long[])
bytes = BitConverter.GetBytes((long) arr.GetValue(ctr));
else
bytes = BitConverter.GetBytes((short) arr.GetValue(ctr));
foreach (byte byteValue in bytes)
Console.Write(" {0:X2}", byteValue);
}
Console.WriteLine();
}
// Display the individual array element values in hexadecimal.
public static void DisplayArrayValues(Array arr, string name)
{
// Get the length of one element in the array.
int elementLength = Buffer.ByteLength(arr) / arr.Length;
string formatString = String.Format(" {{0:X{0}}}", 2 * elementLength);
Console.Write( "{0,11}:", name);
for (int ctr = 0; ctr < arr.Length; ctr++)
Console.Write(formatString, arr.GetValue(ctr));
Console.WriteLine();
}
public static void Main( )
{
// These are the source and destination arrays for BlockCopy.
short[] src = { 258, 259, 260, 261, 262, 263, 264,
265, 266, 267, 268, 269, 270 };
long[] dest = { 17, 18, 19, 20 };
// Display the initial value of the arrays in memory.
Console.WriteLine( "Initial values of arrays:");
Console.WriteLine(" Array values as Bytes:");
DisplayArray(src, "src" );
DisplayArray(dest, "dest");
Console.WriteLine(" Array values:");
DisplayArrayValues(src, "src");
DisplayArrayValues(dest, "dest");
Console.WriteLine();
// Copy bytes 5-10 from source to index 7 in destination and display the result.
Buffer.BlockCopy(src, 5, dest, 7, 6);
Console.WriteLine("Buffer.BlockCopy(src, 5, dest, 7, 6 )");
Console.WriteLine(" Array values as Bytes:");
DisplayArray(src, "src");
DisplayArray(dest, "dest");
Console.WriteLine(" Array values:");
DisplayArrayValues(src, "src");
DisplayArrayValues(dest, "dest");
Console.WriteLine();
// Copy bytes 16-20 from source to index 22 in destination and display the result.
Buffer.BlockCopy(src, 16, dest, 22, 5);
Console.WriteLine("Buffer.BlockCopy(src, 16, dest, 22, 5)");
Console.WriteLine(" Array values as Bytes:");
DisplayArray(src, "src");
DisplayArray(dest, "dest");
Console.WriteLine(" Array values:");
DisplayArrayValues(src, "src");
DisplayArrayValues(dest, "dest");
Console.WriteLine();
// Copy overlapping range of bytes 4-10 to index 5 in source.
Buffer.BlockCopy(src, 4, src, 5, 7 );
Console.WriteLine("Buffer.BlockCopy( src, 4, src, 5, 7)");
Console.WriteLine(" Array values as Bytes:");
DisplayArray(src, "src");
DisplayArray(dest, "dest");
Console.WriteLine(" Array values:");
DisplayArrayValues(src, "src");
DisplayArrayValues(dest, "dest");
Console.WriteLine();
// Copy overlapping range of bytes 16-22 to index 15 in source.
Buffer.BlockCopy(src, 16, src, 15, 7);
Console.WriteLine("Buffer.BlockCopy( src, 16, src, 15, 7)");
Console.WriteLine(" Array values as Bytes:");
DisplayArray(src, "src");
DisplayArray(dest, "dest");
Console.WriteLine(" Array values:");
DisplayArrayValues(src, "src");
DisplayArrayValues(dest, "dest");
}
}
// The example displays the following output:
// Initial values of arrays:
// Array values as Bytes:
// src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 00 12 00 00 00 00 00 00 00 13 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00
// Array values:
// src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
// dest: 0000000000000011 0000000000000012 0000000000000013 0000000000000014
//
// Buffer.BlockCopy(src, 5, dest, 7, 6 )
// Array values as Bytes:
// src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00
// Array values:
// src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
// dest: 0100000000000011 0000000701060105 0000000000000013 0000000000000014
//
// Buffer.BlockCopy(src, 16, dest, 22, 5)
// Array values as Bytes:
// src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
// Array values:
// src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
// dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
//
// Buffer.BlockCopy( src, 4, src, 5, 7)
// Array values as Bytes:
// src: 02 01 03 01 04 04 01 05 01 06 01 07 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
// Array values:
// src: 0102 0103 0404 0501 0601 0701 0108 0109 010A 010B 010C 010D 010E
// dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
//
// Buffer.BlockCopy( src, 16, src, 15, 7)
// Array values as Bytes:
// src: 02 01 03 01 04 04 01 05 01 06 01 07 08 01 09 0A 01 0B 01 0C 01 0D 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
// Array values:
// src: 0102 0103 0404 0501 0601 0701 0108 0A09 0B01 0C01 0D01 010D 010E
// dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
open System
// Display the individual bytes in the array in hexadecimal.
let displayArray (arr: 'a []) (name: string) =
Console.WindowWidth <- 120
printf $"%11s{name}:"
for i = 0 to arr.Length - 1 do
let bytes =
match box arr with
| :? array<int64> ->
BitConverter.GetBytes(box arr[i] :?> int64)
| _ ->
BitConverter.GetBytes(box arr[i] :?> int16)
for byteValue in bytes do
printf $" %02X{byteValue}"
printfn ""
// Display the individual array element values in hexadecimal.
let inline displayArrayValues (arr: ^a []) name =
// Get the length of one element in the array.
let elementLength = Buffer.ByteLength arr / arr.Length
printf $"%11s{name}:"
for value in arr do
printf " %0*X" (2 * elementLength) value
printfn ""
// These are the source and destination arrays for BlockCopy.
let src =
[| 258s; 259s; 260s; 261s; 262s; 263s; 264s
265s; 266s; 267s; 268s; 269s; 270s |]
let dest =
[| 17L; 18L; 19L; 20L |]
// Display the initial value of the arrays in memory.
printfn "Initial values of arrays:"
printfn " Array values as Bytes:"
displayArray src "src"
displayArray dest "dest"
printfn " Array values:"
displayArrayValues src "src"
displayArrayValues dest "dest"
printfn ""
// Copy bytes 5-10 from source to index 7 in destination and display the result.
Buffer.BlockCopy(src, 5, dest, 7, 6)
printfn "Buffer.BlockCopy(src, 5, dest, 7, 6 )"
printfn " Array values as Bytes:"
displayArray src "src"
displayArray dest "dest"
printfn " Array values:"
displayArrayValues src "src"
displayArrayValues dest "dest"
printfn ""
// Copy bytes 16-20 from source to index 22 in destination and display the result.
Buffer.BlockCopy(src, 16, dest, 22, 5)
printfn "Buffer.BlockCopy(src, 16, dest, 22, 5)"
printfn " Array values as Bytes:"
displayArray src "src"
displayArray dest "dest"
printfn " Array values:"
displayArrayValues src "src"
displayArrayValues dest "dest"
printfn ""
// Copy overlapping range of bytes 4-10 to index 5 in source.
Buffer.BlockCopy(src, 4, src, 5, 7)
printfn "Buffer.BlockCopy(src, 4, src, 5, 7)"
printfn " Array values as Bytes:"
displayArray src "src"
displayArray dest "dest"
printfn " Array values:"
displayArrayValues src "src"
displayArrayValues dest "dest"
printfn ""
// Copy overlapping range of bytes 16-22 to index 15 in source.
Buffer.BlockCopy(src, 16, src, 15, 7)
printfn "Buffer.BlockCopy(src, 16, src, 15, 7)"
printfn " Array values as Bytes:"
displayArray src "src"
displayArray dest "dest"
printfn " Array values:"
displayArrayValues src "src"
displayArrayValues dest "dest"
// The example displays the following output:
// Initial values of arrays:
// Array values as Bytes:
// src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 00 12 00 00 00 00 00 00 00 13 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00
// Array values:
// src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
// dest: 0000000000000011 0000000000000012 0000000000000013 0000000000000014
//
// Buffer.BlockCopy(src, 5, dest, 7, 6 )
// Array values as Bytes:
// src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00
// Array values:
// src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
// dest: 0100000000000011 0000000701060105 0000000000000013 0000000000000014
//
// Buffer.BlockCopy(src, 16, dest, 22, 5)
// Array values as Bytes:
// src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
// Array values:
// src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
// dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
//
// Buffer.BlockCopy(src, 4, src, 5, 7)
// Array values as Bytes:
// src: 02 01 03 01 04 04 01 05 01 06 01 07 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
// Array values:
// src: 0102 0103 0404 0501 0601 0701 0108 0109 010A 010B 010C 010D 010E
// dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
//
// Buffer.BlockCopy(src, 16, src, 15, 7)
// Array values as Bytes:
// src: 02 01 03 01 04 04 01 05 01 06 01 07 08 01 09 0A 01 0B 01 0C 01 0D 0D 01 0E 01
// dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
// Array values:
// src: 0102 0103 0404 0501 0601 0701 0108 0A09 0B01 0C01 0D01 010D 010E
// dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
Module Example
' Display the individual bytes in the array in hexadecimal.
Sub DisplayArray(arr As Array, name As String)
Console.Write("{0,11}:", name)
For ctr As Integer = 0 to arr.Length - 1
Dim bytes() As Byte = BitConverter.GetBytes(arr(ctr))
For Each byteValue As Byte In bytes
Console.Write(" {0:X2}", byteValue)
Next
Next
Console.WriteLine()
End Sub
' Display the individual array element values in hexadecimal.
Sub DisplayArrayValues(arr As Array, name As String)
' Get the length of one element in the array.
Dim elementLength As Integer = Buffer.ByteLength(arr) / arr.Length
Dim formatString As String = String.Format(" {{0:X{0}}}", 2 * elementLength)
Console.Write("{0,11}:", name)
For ctr As Integer = 0 to arr.Length - 1
Console.Write(formatString, arr(ctr))
Next
Console.WriteLine()
End Sub
Sub Main()
Console.WindowWidth = 120
' These are source and destination arrays for BlockCopy.
Dim src() As Short = { 258, 259, 260, 261, 262, 263, 264, _
265, 266, 267, 268, 269, 270 }
Dim dest() As Long = { 17, 18, 19, 20 }
' Display the initial value of the arrays in memory.
Console.WriteLine( "Initial values of arrays:")
Console.WriteLine(" Array values as Bytes:")
DisplayArray(src, "src" )
DisplayArray(dest, "dest" )
Console.WriteLine(" Array values:")
DisplayArrayValues(src, "src")
DisplayArrayValues(dest, "dest")
Console.WriteLine()
' Copy bytes 5-10 from source to index 7 in destination and display the result.
Buffer.BlockCopy( src, 5, dest, 7, 6 )
Console.WriteLine("Buffer.BlockCopy(src, 5, dest, 7, 6 )")
Console.WriteLine(" Array values as Bytes:")
DisplayArray(src, "src")
DisplayArray(dest, "dest")
Console.WriteLine(" Array values:")
DisplayArrayValues(src, "src")
DisplayArrayValues(dest, "dest")
Console.WriteLine()
' Copy bytes 16-20 from source to index 22 in destination and display the result.
Buffer.BlockCopy( src, 16, dest, 22, 5 )
Console.WriteLine("Buffer.BlockCopy(src, 16, dest, 22, 5)")
Console.WriteLine(" Array values as Bytes:")
DisplayArray(src, "src")
DisplayArray(dest, "dest")
Console.WriteLine(" Array values:")
DisplayArrayValues(src, "src")
DisplayArrayValues(dest, "dest")
Console.WriteLine()
' Copy overlapping range of bytes 4-10 to index 5 in source.
Buffer.BlockCopy( src, 4, src, 5, 7 )
Console.WriteLine("Buffer.BlockCopy( src, 4, src, 5, 7)")
Console.WriteLine(" Array values as Bytes:")
DisplayArray(src, "src")
DisplayArray(dest, "dest")
Console.WriteLine(" Array values:")
DisplayArrayValues(src, "src")
DisplayArrayValues(dest, "dest")
Console.WriteLine()
' Copy overlapping range of bytes 16-22 to index 15 in source.
Buffer.BlockCopy(src, 16, src, 15, 7)
Console.WriteLine("Buffer.BlockCopy( src, 16, src, 15, 7)")
Console.WriteLine(" Array values as Bytes:")
DisplayArray(src, "src")
DisplayArray(dest, "dest")
Console.WriteLine(" Array values:")
DisplayArrayValues(src, "src")
DisplayArrayValues(dest, "dest")
End Sub
End Module
' This example displays the following output:
' Initial values of arrays:
' Array values as Bytes:
' src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
' dest: 11 00 00 00 00 00 00 00 12 00 00 00 00 00 00 00 13 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00
' Array values:
' src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
' dest: 0000000000000011 0000000000000012 0000000000000013 0000000000000014
'
' Buffer.BlockCopy(src, 5, dest, 7, 6 )
' Array values as Bytes:
' src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
' dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 00 00 14 00 00 00 00 00 00 00
' Array values:
' src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
' dest: 0100000000000011 0000000701060105 0000000000000013 0000000000000014
'
' Buffer.BlockCopy(src, 16, dest, 22, 5)
' Array values as Bytes:
' src: 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
' dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
' Array values:
' src: 0102 0103 0104 0105 0106 0107 0108 0109 010A 010B 010C 010D 010E
' dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
'
' Buffer.BlockCopy( src, 4, src, 5, 7)
' Array values as Bytes:
' src: 02 01 03 01 04 04 01 05 01 06 01 07 08 01 09 01 0A 01 0B 01 0C 01 0D 01 0E 01
' dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
' Array values:
' src: 0102 0103 0404 0501 0601 0701 0108 0109 010A 010B 010C 010D 010E
' dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
'
' Buffer.BlockCopy( src, 16, src, 15, 7)
' Array values as Bytes:
' src: 02 01 03 01 04 04 01 05 01 06 01 07 08 01 09 0A 01 0B 01 0C 01 0D 0D 01 0E 01
' dest: 11 00 00 00 00 00 00 01 05 01 06 01 07 00 00 00 13 00 00 00 00 00 0A 01 0B 01 0C 00 00 00 00 00
' Array values:
' src: 0102 0103 0404 0501 0601 0701 0108 0A09 0B01 0C01 0D01 010D 010E
' dest: 0100000000000011 0000000701060105 010A000000000013 00000000000C010B
Keterangan
Metode ini menyalin count byte dari src, mulai dari srcOffset, ke dst, dimulai dari dstOffset. Keduanya srcOffset dan dstOffset berbasis nol; yaitu, byte pertama di setiap buffer berada di posisi 0, bukan posisi 1.
Metode mengakses BlockCopy byte dalam src array parameter menggunakan offset ke dalam memori, bukan konstruksi pemrograman seperti indeks atau batas array atas dan bawah. Misalnya, jika dalam bahasa pemrograman aplikasi Anda, Anda mendeklarasikan Int32 array dengan batas bawah berbasis nol -50, dan kemudian meneruskan array dan offset 5 ke BlockCopy metode , elemen array pertama yang akan diakses metode adalah elemen kedua dari array, yang berada di indeks -49. Selain itu, byte elemen array mana yang -49 diakses terlebih dahulu tergantung pada endianness komputer yang mengeksekusi aplikasi Anda.
Seperti namanya, BlockCopy metode menyalin blok byte secara keseluruhan, daripada menyalin satu byte pada satu waktu. Oleh karena itu, jika src dan dst mereferensikan array yang sama, dan rentang darisrcOffset + count -1 tumpang tindih rentang daridstOffset + count- 1, nilai byte yang tumpang tindih tidak ditimpa sebelum disalin ke tujuan. Dalam contoh berikut, nilai byte 0-16 dalam array bernama arr disalin ke byte 12-28. Meskipun rentang tumpang tindih, nilai byte sumber berhasil disalin.
const int INT_SIZE = 4;
int[] arr = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 };
Buffer.BlockCopy(arr, 0 * INT_SIZE, arr, 3 * INT_SIZE, 4 * INT_SIZE);
foreach (int value in arr)
Console.Write("{0} ", value);
// The example displays the following output:
// 2 4 6 2 4 6 8 16 18 20
let intSize = 4
let arr = [| 2; 4; 6; 8; 10; 12; 14; 16; 18; 20 |]
Buffer.BlockCopy(arr, 0 * intSize, arr, 3 * intSize, 4 * intSize)
for value in arr do
printf $"{value} "
// The example displays the following output:
// 2 4 6 2 4 6 8 16 18 20
Const INT_SIZE As Integer = 4
Dim arr() As Integer = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 }
Buffer.BlockCopy(arr, 0 * INT_SIZE, arr, 3 * INT_SIZE, 4 * INT_SIZE)
For Each value As Integer In arr
Console.Write("{0} ", value)
Next
' The example displays the following output:
' 2 4 6 2 4 6 8 16 18 20
Dalam contoh berikut, nilai byte 12-28 dalam array bernama arr disalin ke byte 0-16. Sekali lagi, meskipun rentang tumpang tindih, nilai byte sumber berhasil disalin.
const int INT_SIZE = 4;
int[] arr = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 };
Buffer.BlockCopy(arr, 3 * INT_SIZE, arr, 0 * INT_SIZE, 4 * INT_SIZE);
foreach (int value in arr)
Console.Write("{0} ", value);
// The example displays the following output:
// 8 10 12 14 10 12 14 16 18 20
let intSize = 4
let arr = [| 2; 4; 6; 8; 10; 12; 14; 16; 18; 20 |]
Buffer.BlockCopy(arr, 3 * intSize, arr, 0 * intSize, 4 * intSize)
for value in arr do
printf $"{value} "
// The example displays the following output:
// 8 10 12 14 10 12 14 16 18 20
Const INT_SIZE As Integer = 4
Dim arr() As Integer = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 }
Buffer.BlockCopy(arr, 3 * INT_SIZE, arr, 0 * INT_SIZE, 4 * INT_SIZE)
For Each value As Integer In arr
Console.Write("{0} ", value)
Next
' The example displays the following output:
' 8 10 12 14 10 12 14 16 18 20
