Parallel.For Method (Int32, Int32, ParallelOptions, Action<Int32, ParallelLoopState>)
Executes a for loop in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.
Assembly: mscorlib (in mscorlib.dll)
public static ParallelLoopResult For( int fromInclusive, int toExclusive, ParallelOptions parallelOptions, Action<int, ParallelLoopState> body )
Parameters
- fromInclusive
- Type: System.Int32
The start index, inclusive.
- toExclusive
- Type: System.Int32
The end index, exclusive.
- parallelOptions
- Type: System.Threading.Tasks.ParallelOptions
A ParallelOptions instance that configures the behavior of this operation.
- body
- Type: System.Action<Int32, ParallelLoopState>
The delegate that is invoked once per iteration.
Return Value
Type: System.Threading.Tasks.ParallelLoopResultA ParallelLoopResult structure that contains information on what portion of the loop completed.
| Exception | Condition |
|---|---|
| OperationCanceledException |
The exception that is thrown when the CancellationToken in the parallelOptions argument is canceled. |
| ArgumentNullException |
The exception that is thrown when the body argument is null. -or- The exception that is thrown when the parallelOptions argument is null. |
| AggregateException |
The exception that contains all the individual exceptions thrown on all threads. |
| ObjectDisposedException |
The exception that is thrown when the CancellationTokenSource associated with the CancellationToken in the parallelOptions has been disposed. |
The body delegate is invoked once for each value in the iteration range: [fromInclusive, toExclusive). It is provided with the following parameters: the iteration count (an Int32), and a ParallelLoopState instance that may be used to break out of the loop prematurely.
If fromInclusive is greater than or equal to toExclusive, then the method returns immediately without performing any iterations.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
