ParallelEnumerable::Join<TOuter, TInner, TKey, TResult> Method (ParallelQuery<TOuter>^, ParallelQuery<TInner>^, Func<TOuter, TKey>^, Func<TInner, TKey>^, Func<TOuter, TInner, TResult>^, IEqualityComparer<TKey>^)

.NET Framework (current version)

Correlates in parallel the elements of two sequences based on matching keys. A specified IEqualityComparer<T> is used to compare keys.

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

Syntax

C++

public:
generic<typename TOuter, typename TInner, typename TKey, typename TResult>
[ExtensionAttribute]
static ParallelQuery<TResult>^ Join(
	ParallelQuery<TOuter>^ outer,
	ParallelQuery<TInner>^ inner,
	Func<TOuter, TKey>^ outerKeySelector,
	Func<TInner, TKey>^ innerKeySelector,
	Func<TOuter, TInner, TResult>^ resultSelector,
	IEqualityComparer<TKey>^ comparer
)

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, TInner, TResult>^
A function to create a result element from two matching elements.

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

Return Value

Type: System.Linq::ParallelQuery<TResult>^

A sequence that has elements of type TResult that are obtained by performing an inner 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.

Exceptions

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.

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