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ParallelEnumerable.Aggregate(Of TSource, TAccumulate) Method (ParallelQuery(Of TSource), TAccumulate, Func(Of TAccumulate, TSource, TAccumulate))

Applies in parallel an accumulator function over a sequence. The specified seed value is used as the initial accumulator value.

Namespace:  System.Linq
Assemblies:   System.Linq.Parallel (in System.Linq.Parallel.dll)
  System.Core (in System.Core.dll)

'Declaration
<ExtensionAttribute> _
Public Shared Function Aggregate(Of TSource, TAccumulate) ( _
	source As ParallelQuery(Of TSource), _
	seed As TAccumulate, _
	func As Func(Of TAccumulate, TSource, TAccumulate) _
) As TAccumulate

Type Parameters

TSource

The type of the elements of source.

TAccumulate

The type of the accumulator value.

Parameters

source
Type: System.Linq.ParallelQuery(Of TSource)

A sequence to aggregate over.

seed
Type: TAccumulate

The initial accumulator value.

func
Type: System.Func(Of TAccumulate, TSource, TAccumulate)

An accumulator function to be invoked on each element.

Return Value

Type: TAccumulate
The final accumulator value.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery(Of TSource). 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).

ExceptionCondition
OperationCanceledException

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

ArgumentNullException

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

AggregateException

One or more exceptions occurred during the evaluation of the query.

InvalidOperationException

source contains no elements.

.NET Framework

Supported in: 4.6, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

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.

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