ParallelEnumerable.Sum Method (ParallelQuery(Of Nullable(Of Int64)))

.NET Framework (current version)

Computes in parallel the sum of a sequence of values.

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

Public Shared Function Sum (
	source As ParallelQuery(Of Nullable(Of Long))
) As Nullable(Of Long)


Type: System.Linq.ParallelQuery(Of Nullable(Of Int64))

A sequence of values to calculate the sum of.

Return Value

Type: System.Nullable(Of Int64)

The sum of the projected values in the sequence.

Exception Condition

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


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


The sum is larger than MaxValue. -or- One or more exceptions occurred during the evaluation of the query.

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
Return to top