Export (0) Print
Expand All

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

Applies in parallel an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.

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

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

Type Parameters

TSource

The type of the elements of source.

TAccumulate

The type of the accumulator value.

TResult

The type of the resulting 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.

resultSelector
Type: System.Func(Of TAccumulate, TResult)

A function to transform the final accumulator value into the result value.

Return Value

Type: TResult
The transformed 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 or resultSelector 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, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1
Show:
© 2015 Microsoft