ParallelEnumerable.LongCount<TSource> Method (ParallelQuery<TSource>, Func<TSource, Boolean>)
Returns an Int64 that represents how many elements in a parallel sequence satisfy a condition.
Assembly: System.Core (in System.Core.dll)
public static long LongCount<TSource>( this ParallelQuery<TSource> source, Func<TSource, bool> predicate )
A sequence that contains elements to be counted.
Return ValueType: System.Int64
A number that represents how many elements in the sequence satisfy the condition in the predicate function.
The type of the elements of source.
The query was canceled with the token passed in through WithCancellation.
source or predicate is a null reference (Nothing in Visual Basic).
The number of elements in source is larger than MaxValue. -or- One or more exceptions occurred during the evaluation of the query.
The computed result is greater than MaxValue.
Available since 8
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 8.1