Sum Method (ParallelQuery(Nullable(Double)))

ParallelEnumerable.Sum Method (ParallelQuery<Nullable<Double>>)


Computes in parallel the sum of a sequence of values.

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

public static Nullable<double> Sum(
	this ParallelQuery<Nullable<double>> source


Type: System.Linq.ParallelQuery<Nullable<Double>>

A sequence of values to calculate the sum of.

Return Value

Type: System.Nullable<Double>

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 4.5
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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