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ParallelEnumerable::ForAll<TSource> Method

Invokes in parallel the specified action for each element in the source.

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

[ExtensionAttribute]
public:
generic<typename TSource>
static void ForAll(
	ParallelQuery<TSource>^ source, 
	Action<TSource>^ action
)

Type Parameters

TSource

The type of elements of source.

Parameters

source
Type: System.Linq::ParallelQuery<TSource>

The ParallelQuery<TSource> whose elements will be processed by action.

action
Type: System::Action<TSource>

An Action to invoke on each element.

Usage Note

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

ExceptionCondition
OperationCanceledException

The query was canceled with the token passed in through WithCancellation.

ArgumentNullException

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

AggregateException

One or more exceptions occurred during the evaluation of the query.

This is an efficient way to process the output from a parallelized query because it does not require a merge step at the end. For more information, see Merge Options in PLINQ or Order Preservation in PLINQ. Because this method produces a side-effect, it can be used to observe the actual order of execution in a parallel query.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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