Queryable.Reverse(Of TSource) Method (IQueryable(Of TSource))


The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Inverts the order of the elements in a sequence.

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

Public Shared Function Reverse(Of TSource) (
	source As IQueryable(Of TSource)
) As IQueryable(Of TSource)


Type: System.Linq.IQueryable(Of TSource)

A sequence of values to reverse.

Return Value

Type: System.Linq.IQueryable(Of TSource)

An IQueryable(Of T) whose elements correspond to those of the input sequence in reverse order.

Type Parameters


The type of the elements of source.

Exception Condition

source is null.

The Reverse(Of TSource)(IQueryable(Of TSource)) method generates a MethodCallExpression that represents calling Reverse(Of TSource)(IQueryable(Of TSource)) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery(Of TElement)(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling Reverse(Of TSource)(IQueryable(Of TSource)) depends on the implementation of the type of the source parameter. The expected behavior is that it reverses the order of the elements in source.

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

Dim appleLetters As New List(Of Char)(New Char() _
                                      {"a"c, "p"c, "p"c, "l"c, "e"c})

' Reverse the order of the characters in the collection.
Dim reversed As IQueryable(Of 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 

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1
Return to top