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

.NET Framework (current version)
 

Applies in parallel an accumulator function over a sequence. This overload is not available in the sequential implementation.

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

public static TResult Aggregate<TSource, TAccumulate, TResult>(
	this ParallelQuery<TSource> source,
	TAccumulate seed,
	Func<TAccumulate, TSource, TAccumulate> updateAccumulatorFunc,
	Func<TAccumulate, TAccumulate, TAccumulate> combineAccumulatorsFunc,
	Func<TAccumulate, TResult> resultSelector
)

Parameters

source
Type: System.Linq.ParallelQuery<TSource>

A sequence to aggregate over.

seed
Type: TAccumulate

The initial accumulator value.

updateAccumulatorFunc
Type: System.Func<TAccumulate, TSource, TAccumulate>

An accumulator function to be invoked on each element in a partition.

combineAccumulatorsFunc
Type: System.Func<TAccumulate, TAccumulate, TAccumulate>

An accumulator function to be invoked on the yielded accumulator result from each partition.

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.

Exception Condition
OperationCanceledException

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

ArgumentNullException

source or updateAccumulatorFunc or combineAccumulatorsFunc 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.

This overload is specific to processing a parallelized query. A parallelized query may partition the data source sequence into several sub-sequences (partitions). The updateAccumulatorFunc is invoked on each element within partitions. Each partition then yields a single accumulated result. The combineAccumulatorsFunc is then invoked on the results of each partition to yield a single element. This element is then transformed by the resultSelector function.

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
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