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

ParallelEnumerable.Count Method (System.Linq) | Microsoft Learn

ParallelEnumerable.Count Method Definition

Returns the number of elements in a parallel sequence.

Overloads Count<TSource>(ParallelQuery<TSource>)

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Returns the number of elements in a parallel sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static int Count(System::Linq::ParallelQuery<TSource> ^ source);

public static int Count<TSource>(this System.Linq.ParallelQuery<TSource> source);

static member Count : System.Linq.ParallelQuery<'Source> -> int

<Extension()>
Public Function Count(Of TSource) (source As ParallelQuery(Of TSource)) As Integer

Type Parameters

TSource

The type of the elements of source.

Parameters Returns

The number of elements in the input sequence.

Exceptions

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

The number of elements in source is larger than Int32.MaxValue. (In this case the InnerException is OverflowException) -or- One or more exceptions occurred during the evaluation of the query.

See also

Parallel LINQ (PLINQ)

Count<TSource>(ParallelQuery<TSource>, Func<TSource,Boolean>)

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Source:: ParallelEnumerable.cs

Returns a number that represents how many elements in the specified parallel sequence satisfy a condition.

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

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

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

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

Type Parameters

TSource

The type of the elements of source.

Parameters

predicate: Func<TSource,Boolean>

A function to test each element for a condition.

Returns

A number that represents how many elements in the sequence satisfy the condition in the predicate function.

Exceptions

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

The number of elements in source is larger than Int32.MaxValue. (In this case the InnerException is OverflowException) -or- One or more exceptions occurred during the evaluation of the query.