ParallelEnumerable.GroupJoin<TOuter, TInner, TKey, TResult> Method (ParallelQuery<TOuter>, ParallelQuery<TInner>, Func<TOuter, TKey>, Func<TInner, TKey>, Func<TOuter, IEnumerable<TInner>, TResult>)
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.
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. |
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1