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Array.Sort Method (Array)

Sorts the elements in an entire one-dimensional Array using the IComparable implementation of each element of the Array.

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

'Declaration
Public Shared Sub Sort ( _
	array As Array _
)
'Usage
Dim array As Array 

Array.Sort(array)

Parameters

array
Type: System.Array

The one-dimensional Array to sort.

ExceptionCondition
ArgumentNullException

array is Nothing.

RankException

array is multidimensional.

InvalidOperationException

One or more elements in array do not implement the IComparable interface.

Each element of array must implement the IComparable interface to be capable of comparisons with every other element in array.

If the sort is not successfully completed, the results are undefined.

This method uses the QuickSort algorithm. This implementation performs an unstable sort; that is, if two elements are equal, their order might not be preserved. In contrast, a stable sort preserves the order of elements that are equal.

On average, this method is an O(n log n) operation, where n is the Length of array; in the worst case it is an O(n ^ 2) operation.

The following code example shows how to sort the values in an Array using the default comparer and a custom comparer that reverses the sort order. Note that the result might vary depending on the current CultureInfo.

Imports System
Imports System.Collections

Public Class SamplesArray

   Public Class myReverserClass
      Implements IComparer

      ' Calls CaseInsensitiveComparer.Compare with the parameters reversed. 
      Function Compare(x As Object, y As Object) As Integer _
         Implements IComparer.Compare
         Return New CaseInsensitiveComparer().Compare(y, x)
      End Function 'IComparer.Compare

   End Class 'myReverserClass

   Public Shared Sub Main()

      ' Creates and initializes a new Array and a new custom comparer. 
      Dim myArr As [String]() =  {"The", "QUICK", "BROWN", "FOX", "jumps", "over", "the", "lazy", "dog"}
      Dim myComparer = New myReverserClass()

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

      ' Sorts a section of the Array using the default comparer.
      Array.Sort(myArr, 1, 3)
      Console.WriteLine("After sorting a section of the Array using the default comparer:")
      PrintIndexAndValues(myArr)

      ' Sorts a section of the Array using the reverse case-insensitive comparer.
      Array.Sort(myArr, 1, 3, myComparer)
      Console.WriteLine("After sorting a section of the Array using the reverse case-insensitive comparer:")
      PrintIndexAndValues(myArr)

      ' Sorts the entire Array using the default comparer.
      Array.Sort(myArr)
      Console.WriteLine("After sorting the entire Array using the default comparer:")
      PrintIndexAndValues(myArr)

      ' Sorts the entire Array using the reverse case-insensitive comparer.
      Array.Sort(myArr, myComparer)
      Console.WriteLine("After sorting the entire Array using the reverse case-insensitive comparer:")
      PrintIndexAndValues(myArr)

   End Sub 'Main

   Public Shared Sub PrintIndexAndValues(myArr() As [String])

      Dim i As Integer 
      For i = 0 To myArr.Length - 1
         Console.WriteLine("   [{0}] : {1}", i, myArr(i))
      Next i
      Console.WriteLine()

   End Sub 'PrintIndexAndValues

End Class 'SamplesArray


'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 sorting a section of the Array using the default comparer: 
'   [0] : The 
'   [1] : BROWN 
'   [2] : FOX 
'   [3] : QUICK 
'   [4] : jumps 
'   [5] : over 
'   [6] : the 
'   [7] : lazy 
'   [8] : dog 

'After sorting a section of the Array using the reverse case-insensitive comparer: 
'   [0] : The 
'   [1] : QUICK 
'   [2] : FOX 
'   [3] : BROWN 
'   [4] : jumps 
'   [5] : over 
'   [6] : the 
'   [7] : lazy 
'   [8] : dog 

'After sorting the entire Array using the default comparer: 
'   [0] : BROWN 
'   [1] : dog 
'   [2] : FOX 
'   [3] : jumps 
'   [4] : lazy 
'   [5] : over 
'   [6] : QUICK 
'   [7] : the 
'   [8] : The 

'After sorting the entire Array using the reverse case-insensitive comparer: 
'   [0] : the 
'   [1] : The 
'   [2] : QUICK 
'   [3] : over 
'   [4] : lazy 
'   [5] : jumps 
'   [6] : FOX 
'   [7] : dog 
'   [8] : BROWN

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.

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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