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Enumerable.Reverse(Of TSource) Method

Inverts the order of the elements in a sequence.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)

<ExtensionAttribute> _
Public Shared Function Reverse(Of TSource) ( _
	source As IEnumerable(Of TSource) _
) As IEnumerable(Of TSource)
Dim source As IEnumerable(Of TSource)
Dim returnValue As IEnumerable(Of TSource)

returnValue = source.Reverse()

Type Parameters


The type of the elements of source.


Type: System.Collections.Generic.IEnumerable(Of TSource)

A sequence of values to reverse.

Return Value

Type: System.Collections.Generic.IEnumerable(Of TSource)
A sequence whose elements correspond to those of the input sequence in reverse order.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(Of TSource). When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


source is Nothing.

This method is implemented by using deferred execution. The immediate return value is an object that stores all the information that is required to perform the action. The query represented by this method is not executed until the object is enumerated either by calling its GetEnumerator method directly or by using foreach in Visual C# or For Each in Visual Basic.

Unlike OrderBy, this sorting method does not consider the actual values themselves in determining the order. Rather, it just returns the elements in the reverse order from which they are produced by the underlying source.

The following code example demonstrates how to use Reverse(Of TSource) to reverse the order of elements in an array.

' Create a List of Char values. 
Dim appleLetters As New List(Of Char)(New Char() _
                                      {"a"c, "P"c, "P"c, "L"c, "E"c})

' Reverse the order of the elements in the list. 
' (We have to call AsEnumerable() in order to 
' use System.Linq.Enumerable's Reverse() method. 
Dim reversed() As Char = _

Dim output As New System.Text.StringBuilder
For Each chr As Char In reversed
    output.Append(chr & " ")

' Display the output.

' This code produces the following output: 

' E L P P a 

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, 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

.NET Compact Framework

Supported in: 3.5

XNA Framework

Supported in: 3.0