ParallelEnumerable.ForAll(Of TSource) Method (ParallelQuery(Of TSource), Action(Of TSource))
Invokes in parallel the specified action for each element in the source.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Sub ForAll(Of TSource) ( source As ParallelQuery(Of TSource), action As Action(Of TSource) )
Parameters
- source
-
Type:
System.Linq.ParallelQuery(Of TSource)
The ParallelQuery(Of TSource) whose elements will be processed by action.
- action
-
Type:
System.Action(Of TSource)
An Action to invoke on each element.
Type Parameters
- TSource
The type of elements of source.
| 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. |
This is an efficient way to process the output from a parallelized query because it does not require a merge step at the end. For more information, see Merge Options in PLINQ or Order Preservation in PLINQ. Because this method produces a side-effect, it can be used to observe the actual order of execution in a parallel query.
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1