ParallelEnumerable.Sum(Of TSource) Method (ParallelQuery(Of TSource), Func(Of TSource, Nullable(Of Double)))
Computes in parallel the sum of the sequence of values that are obtained by invoking a transform function on each element of the input sequence.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function Sum(Of TSource) ( source As ParallelQuery(Of TSource), selector As Func(Of TSource, Nullable(Of Double)) ) As Nullable(Of Double)
A sequence of values to calculate the sum of.
The type of elements of source.
The query was canceled with the token passed in through WithCancellation.
source or selector 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.
Available since 4.5
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 8.1