ParallelEnumerable::Aggregate<TSource, TAccumulate, TResult> Method (ParallelQuery<TSource>^, TAccumulate, Func<TAccumulate, TSource, TAccumulate>^, Func<TAccumulate, TResult>^)

.NET Framework (current version)

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)

Syntax

C++

public:
generic<typename TSource, typename TAccumulate, typename TResult>
[ExtensionAttribute]
static TResult Aggregate(
	ParallelQuery<TSource>^ source,
	TAccumulate seed,
	Func<TAccumulate, TSource, TAccumulate>^ func,
	Func<TAccumulate, TResult>^ resultSelector
)

Parameters

source: Type: System.Linq::ParallelQuery<TSource>^
A sequence to aggregate over.

seed: Type: TAccumulate
The initial accumulator value.

func: Type: System::Func<TAccumulate, TSource, TAccumulate>^
An accumulator function to be invoked on each element.

resultSelector: Type: System::Func<TAccumulate, TResult>^
A function to transform the final accumulator value into the result value.

Return Value

Type: TResult

The transformed final accumulator value.

Type Parameters

TSource: The type of the elements of source.

TAccumulate: The type of the accumulator value.

TResult: The type of the resulting value.

Exceptions

Exception	Condition
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.

Examples

Version Information

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