GroupJoin(TOuter, TInner, TKey, TResult) Method (ParallelQuery(TOuter), ParallelQuery(TInner), Func(TOuter, TKey), Func(TInner, TKey), Func(TOuter, IEnumerable(TInner), TResult), IEqualityComparer(TKey))

Task Parallel System.Threading

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Visual Basic C#

.NET Framework Class Library

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

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Correlates in parallel the elements of two sequences based on key equality and groups the results. A specified IEqualityComparer{T} is used to compare keys.

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

Syntax

Visual Basic (Declaration)
Public Shared Function GroupJoin(Of TOuter, TInner, TKey, TResult) ( _ outer As ParallelQuery(Of TOuter), _ inner As ParallelQuery(Of TInner), _ outerKeySelector As Func(Of TOuter, TKey), _ innerKeySelector As Func(Of TInner, TKey), _ resultSelector As Func(Of TOuter, IEnumerable(Of TInner), TResult), _ comparer As IEqualityComparer(Of TKey) _ ) As ParallelQuery(Of TResult)

Visual Basic (Declaration)

Public Shared Function GroupJoin(Of TOuter, TInner, TKey, TResult) ( _
	outer As ParallelQuery(Of TOuter), _
	inner As ParallelQuery(Of TInner), _
	outerKeySelector As Func(Of TOuter, TKey), _
	innerKeySelector As Func(Of TInner, TKey), _
	resultSelector As Func(Of TOuter, IEnumerable(Of TInner), TResult), _
	comparer As IEqualityComparer(Of TKey) _
) As ParallelQuery(Of TResult)

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

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

Parameters

outer: Type: System.Linq..::.ParallelQuery<(Of <(TOuter>)>)
The first sequence to join.

inner: Type: System.Linq..::.ParallelQuery<(Of <(TInner>)>)
The sequence to join to the first sequence.

outerKeySelector: Type: System..::.Func<(Of <(TOuter, TKey>)>)
A function to extract the join key from each element of the first sequence.

innerKeySelector: Type: System..::.Func<(Of <(TInner, TKey>)>)
A function to extract the join key from each element of the second sequence.

resultSelector: Type: System..::.Func<(Of <(TOuter, IEnumerable<(Of <(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.

comparer: Type: System.Collections.Generic..::.IEqualityComparer<(Of <(TKey>)>)
An IEqualityComparer<(Of <(T>)>) to hash and compare keys.

Type Parameters

TOuter: The type of the elements of the first sequence.
TInner: The type of the elements of the second sequence.
TKey: The type of the keys returned by the key selector functions.
TResult: The type of the result elements.

Return Value

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

Exceptions

Exception	Condition
System..::.ArgumentNullException	outer or inner or outerKeySelector or innerKeySelector or resultSelector is a null reference (Nothing in Visual Basic).