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ParallelEnumerable.AsParallel<TSource> Method (Partitioner<TSource>)

Enables parallelization of a query, as sourced by a custom partitioner that is responsible for splitting the input sequence into partitions.

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

public static ParallelQuery<TSource> AsParallel<TSource>(
	this Partitioner<TSource> source

Type Parameters


The type of elements of source.


Type: System.Collections.Concurrent.Partitioner<TSource>
A partitioner over the input sequence.

Return Value

Type: System.Linq.ParallelQuery<TSource>
The source as a ParallelQuery to bind to ParallelEnumerable extension methods.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type Partitioner<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 a null reference (Nothing in Visual Basic).

The source partitioner's GetOrderedPartitions method is used when ordering is enabled, whereas the partitioner's GetPartitions is used if ordering is not enabled (the default). The source partitioner's GetDynamicPartitions and GetDynamicOrderedPartitions are not used. For more information and examples, see Custom Partitioners for PLINQ and TPL.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.