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

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

ParallelEnumerable.All<TSource> Method Definition

Determines in parallel whether all elements of a sequence satisfy a condition.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static bool All(System::Linq::ParallelQuery<TSource> ^ source, Func<TSource, bool> ^ predicate);

public static bool All<TSource>(this System.Linq.ParallelQuery<TSource> source, Func<TSource,bool> predicate);

static member All : System.Linq.ParallelQuery<'Source> * Func<'Source, bool> -> bool

<Extension()>
Public Function All(Of TSource) (source As ParallelQuery(Of TSource), predicate As Func(Of TSource, Boolean)) As Boolean

Type Parameters

TSource

The type of elements of source.

Parameters

predicate: Func<TSource,Boolean>

A function to test each element for a condition.

Returns

true if every element of the source sequence passes the test in the specified predicate, or if the sequence is empty; otherwise, false.

Exceptions

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

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