ParallelEnumerable.GroupJoin<TOuter, TInner, TKey, TResult> Method (ParallelQuery<TOuter>, ParallelQuery<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, IEnumerable<TInner>, TResult>)

.NET Framework (current version)
 

Correlates in parallel the elements of two sequences based on equality of keys and groups the results. The default equality comparer is used to compare keys.

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

public static ParallelQuery<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(
	this ParallelQuery<TOuter> outer,
	ParallelQuery<TInner> inner,
	Func<TOuter, TKey> outerKeySelector,
	Func<TInner, TKey> innerKeySelector,
	Func<TOuter, IEnumerable<TInner>, TResult> resultSelector
)

Parameters

outer
Type: System.Linq.ParallelQuery<TOuter>

The first sequence to join.

inner
Type: System.Linq.ParallelQuery<TInner>

The sequence to join to the first sequence.

outerKeySelector
Type: System.Func<TOuter, TKey>

A function to extract the join key from each element of the first sequence.

innerKeySelector
Type: System.Func<TInner, TKey>

A function to extract the join key from each element of the second sequence.

resultSelector
Type: System.Func<TOuter, IEnumerable<TInner>, TResult>

A function to create a result element from an element from the first sequence and a collection of matching elements from the second sequence.

Return Value

Type: System.Linq.ParallelQuery<TResult>

A sequence that has elements of type TResult that are obtained by performing a grouped join on two sequences.

Type Parameters

TOuter

The type of the elements of the second sequence.

TInner

The type of the elements of the first sequence.

TKey

The type of the keys returned by the key selector functions.

TResult

The type of the result elements.

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 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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