ParallelEnumerable.LongCount<TSource> Method (ParallelQuery<TSource>, Func<TSource, Boolean>)

.NET Framework (current version)
 

Returns an Int64 that represents how many elements in a parallel sequence satisfy a condition.

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

public static long LongCount<TSource>(
	this ParallelQuery<TSource> source,
	Func<TSource, bool> predicate
)

Parameters

source
Type: System.Linq.ParallelQuery<TSource>

A sequence that contains elements to be counted.

predicate
Type: System.Func<TSource, Boolean>

A function to test each element for a condition.

Return Value

Type: System.Int64

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

Type Parameters

TSource

The type of the elements of source.

Exception Condition
OperationCanceledException

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

ArgumentNullException

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

AggregateException

The number of elements in source is larger than MaxValue. -or- One or more exceptions occurred during the evaluation of the query.

OverflowException

The computed result is greater than MaxValue.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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