Parallel.ForEach<TSource> Method (IEnumerable<TSource>, ParallelOptions, Action<TSource, ParallelLoopState>)
Executes a foreach (For Each in Visual Basic) operation on an IEnumerable in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.
Namespace: System.Threading.Tasks
Assembly: mscorlib (in mscorlib.dll)
public static ParallelLoopResult ForEach<TSource>( IEnumerable<TSource> source, ParallelOptions parallelOptions, Action<TSource, ParallelLoopState> body )
Type Parameters
- TSource
The type of the data in the source.
Parameters
- source
- Type: System.Collections.Generic.IEnumerable<TSource>
An enumerable data source.
- parallelOptions
- Type: System.Threading.Tasks.ParallelOptions
An object that configures the behavior of this operation.
- body
- Type: System.Action<TSource, ParallelLoopState>
The delegate that is invoked once per iteration.
Return Value
Type: System.Threading.Tasks.ParallelLoopResultA structure that contains information about which portion of the loop completed.
| Exception | Condition |
|---|---|
| OperationCanceledException | The CancellationToken in the parallelOptions argument is canceled |
| ArgumentNullException | The source argument is null. -or- The parallelOptions argument is null. -or- The body argument is null. |
| AggregateException | The exception that contains all the individual exceptions thrown on all threads. |
| ObjectDisposedException | The CancellationTokenSource associated with the CancellationToken in the parallelOptions has been disposed. |
The body delegate is invoked once for each element in the source enumerable. It is provided with the following parameters: the current element, and a ParallelLoopState instance that may be used to break out of the loop prematurely.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
