Array.Reverse Method (Array) (System)

Reverse Method (Array)

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

Array..::.Reverse Method (Array)

Reverses the sequence of the elements in the entire one-dimensional Array.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

Visual Basic (Declaration)

Public Shared Sub Reverse ( _
    array As Array _
)

Visual Basic (Usage)

Dim array As Array

Array.Reverse(array)

public static void Reverse(
    Array array
)

Visual C++

public:
static void Reverse(
    Array^ array
)

JScript

public static function Reverse(
    array : Array
)

Parameters

array: Type: System..::.Array
The one-dimensional Array to reverse.

Exceptions

Exception	Condition
ArgumentNullException	array is nullNothingnullptra null reference (Nothing in Visual Basic).
RankException	array is multidimensional.

Remarks

After a call to this method, the element at myArray[i], where i is any index in the array, moves to myArray[j], where j equals (myArray.Length + myArray.GetLowerBound(0)) - (i - myArray.GetLowerBound(0)) - 1.

This method is an O(n) operation, where n is the Length of array.

Examples

The following code example shows how to reverse the sort of the values in an Array.

Visual Basic

Imports System
Imports Microsoft.VisualBasic

Public Class SamplesArray    

    Public Shared Sub Main()

        ' Creates and initializes a new Array.
        Dim myArray As Array = Array.CreateInstance(GetType(String), 9)
        myArray.SetValue("The", 0)
        myArray.SetValue("quick", 1)
        myArray.SetValue("brown", 2)
        myArray.SetValue("fox", 3)
        myArray.SetValue("jumps", 4)
        myArray.SetValue("over", 5)
        myArray.SetValue("the", 6)
        myArray.SetValue("lazy", 7)
        myArray.SetValue("dog", 8)

        ' Displays the values of the Array.
        Console.WriteLine("The Array initially contains the " _
           + "following values:")
        PrintIndexAndValues(myArray)

        ' Reverses the sort of the values of the Array.
        Array.Reverse(myArray)

        ' Displays the values of the Array.
        Console.WriteLine("After reversing:")
        PrintIndexAndValues(myArray)
    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(ControlChars.Tab + "[{0}]:" + ControlChars.Tab _
               + "{1}", i, myArray.GetValue(i))
        Next i
    End Sub
End Class

' This code produces the following output.
' 
' The Array initially contains the following values:
'     [0]:    The
'     [1]:    quick
'     [2]:    brown
'     [3]:    fox
'     [4]:    jumps
'     [5]:    over
'     [6]:    the
'     [7]:    lazy
'     [8]:    dog
' After reversing:
'     [0]:    dog
'     [1]:    lazy
'     [2]:    the
'     [3]:    over
'     [4]:    jumps
'     [5]:    fox
'     [6]:    brown
'     [7]:    quick
'     [8]:    The

using System;
public class SamplesArray  {

   public static void Main()  {

      // Creates and initializes a new Array.
      Array myArray=Array.CreateInstance( typeof(String), 9 );
      myArray.SetValue( "The", 0 );
      myArray.SetValue( "quick", 1 );
      myArray.SetValue( "brown", 2 );
      myArray.SetValue( "fox", 3 );
      myArray.SetValue( "jumps", 4 );
      myArray.SetValue( "over", 5 );
      myArray.SetValue( "the", 6 );
      myArray.SetValue( "lazy", 7 );
      myArray.SetValue( "dog", 8 );

      // Displays the values of the Array.
      Console.WriteLine( "The Array initially contains the following values:" );
      PrintIndexAndValues( myArray );

      // Reverses the sort of the values of the Array.
      Array.Reverse( myArray );

      // Displays the values of the Array.
      Console.WriteLine( "After reversing:" );
      PrintIndexAndValues( myArray );
   }


   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 Array initially contains the following values:
    [0]:    The
    [1]:    quick
    [2]:    brown
    [3]:    fox
    [4]:    jumps
    [5]:    over
    [6]:    the
    [7]:    lazy
    [8]:    dog
After reversing:
    [0]:    dog
    [1]:    lazy
    [2]:    the
    [3]:    over
    [4]:    jumps
    [5]:    fox
    [6]:    brown
    [7]:    quick
    [8]:    The
*/

Visual C++

using namespace System;
void PrintIndexAndValues( Array^ myArray );
void main()
{
   // Creates and initializes a new Array instance.
   Array^ myArray = Array::CreateInstance( String::typeid, 9 );
   myArray->SetValue( "The", 0 );
   myArray->SetValue( "quick", 1 );
   myArray->SetValue( "brown", 2 );
   myArray->SetValue( "fox", 3 );
   myArray->SetValue( "jumped", 4 );
   myArray->SetValue( "over", 5 );
   myArray->SetValue( "the", 6 );
   myArray->SetValue( "lazy", 7 );
   myArray->SetValue( "dog", 8 );

   // Displays the values of the Array.
   Console::WriteLine(  "The Array instance initially contains the following values:" );
   PrintIndexAndValues( myArray );

   // Reverses the sort of the values of the Array.
   Array::Reverse( myArray );

   // Displays the values of the Array.
   Console::WriteLine(  "After reversing:" );
   PrintIndexAndValues( myArray );
}

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 Array instance initially contains the following values:
     [0]:    The
     [1]:    quick
     [2]:    brown
     [3]:    fox
     [4]:    jumped
     [5]:    over
     [6]:    the
     [7]:    lazy
     [8]:    dog
 After reversing:
     [0]:    dog
     [1]:    lazy
     [2]:    the
     [3]:    over
     [4]:    jumped
     [5]:    fox
     [6]:    brown
     [7]:    quick
     [8]:    The
 */

JScript

import System;

// Creates and initializes a new Array.
var myArray : System.Array= System.Array.CreateInstance( System.String, 9 );
myArray.SetValue( "The", 0 );
myArray.SetValue( "quick", 1 );
myArray.SetValue( "brown", 2 );
myArray.SetValue( "fox", 3 );
myArray.SetValue( "jumped", 4 );
myArray.SetValue( "over", 5 );
myArray.SetValue( "the", 6 );
myArray.SetValue( "lazy", 7 );
myArray.SetValue( "dog", 8 );

// Displays the values of the Array.
Console.WriteLine( "The Array initially contains the following values:" );
PrintIndexAndValues( myArray );

// Reverses the sort of the values of the Array.
System.Array.Reverse( myArray );

// Displays the values of the Array.
Console.WriteLine( "After reversing:" );
PrintIndexAndValues( myArray );


function PrintIndexAndValues( myArray : System.Array )  {
   for ( var i : int = 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 Array initially contains the following values:
     [0]:    The
     [1]:    quick
     [2]:    brown
     [3]:    fox
     [4]:    jumped
     [5]:    over
     [6]:    the
     [7]:    lazy
     [8]:    dog
 After reversing:
     [0]:    dog
     [1]:    lazy
     [2]:    the
     [3]:    over
     [4]:    jumped
     [5]:    fox
     [6]:    brown
     [7]:    quick
     [8]:    The
 */

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Reference