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ParallelEnumerable.AsOrdered Method (ParallelQuery)

Enables treatment of a data source as if it were ordered, overriding the default of unordered. AsOrdered may only be invoked on non-generic sequences returned by AsParallel, ParallelEnumerable.Range, and ParallelEnumerable.Repeat.

Namespace:  System.Linq
Assemblies:   System.Linq.Parallel (in System.Linq.Parallel.dll)
  System.Core (in System.Core.dll)

'Declaration
<ExtensionAttribute> _
Public Shared Function AsOrdered ( _
	source As ParallelQuery _
) As ParallelQuery

Parameters

source
Type: System.Linq.ParallelQuery

The input sequence.

Return Value

Type: System.Linq.ParallelQuery
The source sequence which will maintain the original ordering in the subsequent query operators.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery. 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).

ExceptionCondition
ArgumentNullException

source is a null reference (Nothing in Visual Basic).

InvalidOperationException

thrown if source contains no elements

-or-

if AsOrdered is called midway through a query. It is allowed to be called immediately after AsParallel, Range or Repeat(Of TResult).

A natural tension exists between performance and preserving order in parallel processing. By default, a parallelized query behaves as if the ordering of the results is arbitrary unless AsOrdered is applied or there is an explicit OrderBy operator in the query. For more information, see Order Preservation in PLINQ.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Portable Class Library

Supported in: Portable Class Library
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