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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.linq.parallelenumerable.forall below:

ParallelEnumerable.ForAll<TSource> Method (System.Linq) | Microsoft Learn

ParallelEnumerable.ForAll<TSource> Method Definition

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

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static void ForAll(System::Linq::ParallelQuery<TSource> ^ source, Action<TSource> ^ action);

public static void ForAll<TSource>(this System.Linq.ParallelQuery<TSource> source, Action<TSource> action);

static member ForAll : System.Linq.ParallelQuery<'Source> * Action<'Source> -> unit

<Extension()>
Public Sub ForAll(Of TSource) (source As ParallelQuery(Of TSource), action As Action(Of TSource))

Type Parameters

TSource

The type of elements of source.

Parameters

action: Action<TSource>

An Action to invoke on each element.

Exceptions

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

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

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. 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.