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Queryable.Reverse<TSource> Method

Inverts the order of the elements in a sequence.

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

public static IQueryable<TSource> Reverse<TSource>(
	this IQueryable<TSource> source
)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Linq.IQueryable<TSource>
A sequence of values to reverse.

Return Value

Type: System.Linq.IQueryable<TSource>
An IQueryable<T> 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 IQueryable<TSource>. When you use instance method syntax to call this method, omit the first parameter.

ExceptionCondition
ArgumentNullException

source is null.

The Reverse<TSource>(IQueryable<TSource>) method generates a MethodCallExpression that represents calling Reverse<TSource>(IQueryable<TSource>) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<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<TSource>(IQueryable<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<TSource>(IQueryable<TSource>) to reverse the order of elements in an array.


         char[] apple = { 'a', 'p', 'p', 'l', 'e' };

         // Reverse the order of the characters in the collection.
         IQueryable<char> reversed = apple.AsQueryable().Reverse();

         foreach (char chr in reversed)
            outputBlock.Text += chr + " ";
         outputBlock.Text += "\n";

         /*
             This code produces the following output:

             e l p p a
         */



Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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