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 )
The type of the elements of source.
- Type: System.Linq.ParallelQuery<>
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.
Usage NoteIn Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery<>. 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).
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.