ParallelEnumerable::LongCount<TSource> Method (ParallelQuery<TSource>, Func<TSource, Boolean>)
Returns an Int64 that represents how many elements in a parallel sequence satisfy a condition.
Assemblies: System.Linq.Parallel (in System.Linq.Parallel.dll)
System.Core (in System.Core.dll)
[ExtensionAttribute] public: generic<typename TSource> static long long LongCount( 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.
Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.