Export (0) Print
Expand All

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

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
)

Type Parameters

TSource

The type of the elements of source.

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.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

ExceptionCondition
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.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1
Show:
© 2015 Microsoft