GroupBy(TSource, TKey) Method (ParallelQuery(TSource), Func(TSource, TKey))

ParallelEnumerable.GroupBy<TSource, TKey> Method (ParallelQuery<TSource>, Func<TSource, TKey>)

.NET Framework (current version)
 

Groups in parallel the elements of a sequence according to a specified key selector function.

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

public static ParallelQuery<IGrouping<TKey, TSource>> GroupBy<TSource, TKey>(
	this ParallelQuery<TSource> source,
	Func<TSource, TKey> keySelector
)

Parameters

source
Type: System.Linq.ParallelQuery<TSource>

An OrderedParallelQuery{TSource}that contains elements to sort.

keySelector
Type: System.Func<TSource, TKey>

A function to extract a key from an element.

Return Value

Type: System.Linq.ParallelQuery<IGrouping<TKey, TSource>>

A sequence of groups that are sorted descending according to TKey.

Type Parameters

TSource

The type of elements of source.

TKey

The type of the key returned by keySelector.

Exception Condition
OperationCanceledException

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

ArgumentNullException

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

AggregateException

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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