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Enumerable.Reverse<TSource> Method

Inverts the order of the elements in a sequence.

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

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

Type Parameters

TSource

The type of the elements of source.

Parameters

source
Type: System.Collections.Generic.IEnumerable<TSource>
A sequence of values to reverse.

Return Value

Type: System.Collections.Generic.IEnumerable<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<TSource>. When you use instance method syntax to call this method, omit the first parameter.

ExceptionCondition
ArgumentNullException

source is null.

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<TSource> to reverse the order of elements in an array.


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

      char[] reversed = apple.Reverse().ToArray();

      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, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

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

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