ForAll(TSource) Method

Task Parallel System.Threading

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

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

Syntax

Visual Basic (Declaration)
Public Shared Sub ForAll(Of TSource) ( _ source As ParallelQuery(Of TSource), _ action As Action(Of TSource) _ )

C#
public static void ForAll<TSource>( ParallelQuery<TSource> source, Action<TSource> action )

Parameters

source: Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
The ParallelQuery<(Of <(TSource>)>) whose elements will be processed by action.

action: Type: System..::.Action<(Of <(TSource>)>)
An Action to invoke on each element.

Type Parameters

TSource: The type of elements of source.

Remarks

This is an efficient way to process the output from a parallelized query because it does not require a merge step at the end. However, order of execution is non-deterministic.

Exceptions

Exception	Condition
System..::.ArgumentNullException	source or action is a null reference (Nothing in Visual Basic).
System..::.AggregateException	One or more exceptions occurred during the evaluation of the query.
System..::.OperationCanceledException	The query was canceled.