The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.
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.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource, typename TKey> [ExtensionAttribute] static ParallelQuery<IGrouping<TKey, TSource>^>^ GroupBy( 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 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
Show: