Parallel Parallel Parallel Parallel Class

Definition

Provides support for parallel loops and regions.

public ref class Parallel abstract sealed
public static class Parallel
type Parallel = class
Public Class Parallel
Inheritance
ParallelParallelParallelParallel

Examples

This example demonstrates several approaches to implementing a parallel loop using multiple language constructs.

using System.Threading.Tasks;   
class Test
{
    static int N = 1000;

    static void TestMethod()
    {
        // Using a named method.
        Parallel.For(0, N, Method2);

        // Using an anonymous method.
        Parallel.For(0, N, delegate(int i)
        {
            // Do Work.
        });

        // Using a lambda expression.
        Parallel.For(0, N, i =>
        {
            // Do Work.
        });
    }

    static void Method2(int i)
    {
        // Do work.
    }
}
Imports System.Threading.Tasks
Module Module1

    Sub Main()
        Dim N As Integer = 1000

        ' Using a named method
        Parallel.For(0, N, AddressOf Method2)

        ' Using a lambda expression.
        Parallel.For(0, N, Sub(i)
                               ' Do Work
                           End Sub)
    End Sub

    Sub Method2(ByVal i As Integer)
        ' Do work.
    End Sub

End Module

Remarks

The Parallel class provides library-based data parallel replacements for common operations such as for loops, for each loops, and execution of a set of statements.

Methods

For(Int32, Int32, Action<Int32,ParallelLoopState>) For(Int32, Int32, Action<Int32,ParallelLoopState>) For(Int32, Int32, Action<Int32,ParallelLoopState>) For(Int32, Int32, Action<Int32,ParallelLoopState>)

Executes a for (For in Visual Basic) loop in which iterations may run in parallel and the state of the loop can be monitored and manipulated.

For(Int32, Int32, Action<Int32>) For(Int32, Int32, Action<Int32>) For(Int32, Int32, Action<Int32>) For(Int32, Int32, Action<Int32>)

Executes a for (For in Visual Basic) loop in which iterations may run in parallel.

For(Int64, Int64, Action<Int64,ParallelLoopState>) For(Int64, Int64, Action<Int64,ParallelLoopState>) For(Int64, Int64, Action<Int64,ParallelLoopState>) For(Int64, Int64, Action<Int64,ParallelLoopState>)

Executes a for (For in Visual Basic) loop with 64-bit indexes in which iterations may run in parallel and the state of the loop can be monitored and manipulated.

For(Int64, Int64, Action<Int64>) For(Int64, Int64, Action<Int64>) For(Int64, Int64, Action<Int64>) For(Int64, Int64, Action<Int64>)

Executes a for (For in Visual Basic) loop with 64-bit indexes in which iterations may run in parallel.

For(Int32, Int32, ParallelOptions, Action<Int32,ParallelLoopState>) For(Int32, Int32, ParallelOptions, Action<Int32,ParallelLoopState>) For(Int32, Int32, ParallelOptions, Action<Int32,ParallelLoopState>) For(Int32, Int32, ParallelOptions, Action<Int32,ParallelLoopState>)

Executes a for (For in Visual Basic) loop in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

For(Int32, Int32, ParallelOptions, Action<Int32>) For(Int32, Int32, ParallelOptions, Action<Int32>) For(Int32, Int32, ParallelOptions, Action<Int32>) For(Int32, Int32, ParallelOptions, Action<Int32>)

Executes a for (For in Visual Basic) loop in which iterations may run in parallel and loop options can be configured.

For(Int64, Int64, ParallelOptions, Action<Int64,ParallelLoopState>) For(Int64, Int64, ParallelOptions, Action<Int64,ParallelLoopState>) For(Int64, Int64, ParallelOptions, Action<Int64,ParallelLoopState>) For(Int64, Int64, ParallelOptions, Action<Int64,ParallelLoopState>)

Executes a for (For in Visual Basic) loop with 64-bit indexes in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

For(Int64, Int64, ParallelOptions, Action<Int64>) For(Int64, Int64, ParallelOptions, Action<Int64>) For(Int64, Int64, ParallelOptions, Action<Int64>) For(Int64, Int64, ParallelOptions, Action<Int64>)

Executes a for (For in Visual Basic) loop with 64-bit indexes in which iterations may run in parallel and loop options can be configured.

For<TLocal>(Int64, Int64, ParallelOptions, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int64, Int64, ParallelOptions, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int64, Int64, ParallelOptions, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int64, Int64, ParallelOptions, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a for (For in Visual Basic) loop with 64-bit indexes and thread-local data in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

For<TLocal>(Int32, Int32, ParallelOptions, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int32, Int32, ParallelOptions, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int32, Int32, ParallelOptions, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int32, Int32, ParallelOptions, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a for (For in Visual Basic) loop with thread-local data in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

For<TLocal>(Int32, Int32, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int32, Int32, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int32, Int32, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int32, Int32, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a for (For in Visual Basic) loop with thread-local data in which iterations may run in parallel, and the state of the loop can be monitored and manipulated.

For<TLocal>(Int64, Int64, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int64, Int64, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int64, Int64, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) For<TLocal>(Int64, Int64, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a for (For in Visual Basic) loop with 64-bit indexes and thread-local data in which iterations may run in parallel, and the state of the loop can be monitored and manipulated.

ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with thread-local data 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..

ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with thread-local data and 64-bit indexes 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.

ForEach<TSource,TLocal>(Partitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(Partitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(Partitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(Partitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with thread-local data on a Partitioner in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, ParallelOptions, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with 64-bit indexes and with thread-local data on a OrderablePartitioner<TSource> in which iterations may run in parallel , loop options can be configured, and the state of the loop can be monitored and manipulated.

ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with thread-local data on an IEnumerable in which iterations may run in parallel, and the state of the loop can be monitored and manipulated.

ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(IEnumerable<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with thread-local data on an IEnumerable in which iterations may run in parallel and the state of the loop can be monitored and manipulated.

ForEach<TSource,TLocal>(Partitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(Partitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(Partitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(Partitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with thread-local data on a Partitioner in which iterations may run in parallel and the state of the loop can be monitored and manipulated.

ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>) ForEach<TSource,TLocal>(OrderablePartitioner<TSource>, Func<TLocal>, Func<TSource,ParallelLoopState,Int64,TLocal,TLocal>, Action<TLocal>)

Executes a foreach (For Each in Visual Basic) operation with thread-local data on a OrderablePartitioner<TSource> in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource>)

Executes a foreach (For Each in Visual Basic) operation on an IEnumerable in which iterations may run in parallel and loop options can be configured.

ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource,ParallelLoopState>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource,ParallelLoopState>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource,ParallelLoopState>) ForEach<TSource>(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.

ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState>)

Executes a foreach (For Each in Visual Basic) operation on an IEnumerable in which iterations may run in parallel, and the state of the loop can be monitored and manipulated.

ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource>) ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource>) ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource>) ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource>)

Executes a foreach (For Each in Visual Basic) operation on a Partitioner in which iterations may run in parallel and loop options can be configured.

ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState>) ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState>) ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState>) ForEach<TSource>(Partitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState>)

Executes a foreach (For Each in Visual Basic) operation on a Partitioner in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

ForEach<TSource>(OrderablePartitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(OrderablePartitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(OrderablePartitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(OrderablePartitioner<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>)

Executes a foreach (For Each in Visual Basic) operation on a OrderablePartitioner<TSource> in which iterations may run in parallel, loop options can be configured, and the state of the loop can be monitored and manipulated.

ForEach<TSource>(IEnumerable<TSource>, Action<TSource>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource>)

Executes a foreach (For Each in Visual Basic) operation on an IEnumerable in which iterations may run in parallel.

ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(IEnumerable<TSource>, Action<TSource,ParallelLoopState,Int64>)

Executes a foreach (For Each in Visual Basic) operation with 64-bit indexes on an IEnumerable in which iterations may run in parallel, and the state of the loop can be monitored and manipulated.

ForEach<TSource>(Partitioner<TSource>, Action<TSource>) ForEach<TSource>(Partitioner<TSource>, Action<TSource>) ForEach<TSource>(Partitioner<TSource>, Action<TSource>) ForEach<TSource>(Partitioner<TSource>, Action<TSource>)

Executes a foreach (For Each in Visual Basic) operation on a Partitioner in which iterations may run in parallel.

ForEach<TSource>(Partitioner<TSource>, Action<TSource,ParallelLoopState>) ForEach<TSource>(Partitioner<TSource>, Action<TSource,ParallelLoopState>) ForEach<TSource>(Partitioner<TSource>, Action<TSource,ParallelLoopState>) ForEach<TSource>(Partitioner<TSource>, Action<TSource,ParallelLoopState>)

Executes a foreach (For Each in Visual Basic) operation on a Partitioner in which iterations may run in parallel, and the state of the loop can be monitored and manipulated.

ForEach<TSource>(OrderablePartitioner<TSource>, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(OrderablePartitioner<TSource>, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(OrderablePartitioner<TSource>, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(OrderablePartitioner<TSource>, Action<TSource,ParallelLoopState,Int64>)

Executes a foreach (For Each in Visual Basic) operation on a OrderablePartitioner<TSource> in which iterations may run in parallel and the state of the loop can be monitored and manipulated.

ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>) ForEach<TSource>(IEnumerable<TSource>, ParallelOptions, Action<TSource,ParallelLoopState,Int64>)

Executes a foreach (For Each in Visual Basic) operation with 64-bit indexes 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.

Invoke(Action[]) Invoke(Action[]) Invoke(Action[]) Invoke(Action[])

Executes each of the provided actions, possibly in parallel.

Invoke(ParallelOptions, Action[]) Invoke(ParallelOptions, Action[]) Invoke(ParallelOptions, Action[]) Invoke(ParallelOptions, Action[])

Executes each of the provided actions, possibly in parallel, unless the operation is cancelled by the user.

Applies to

Thread Safety

All public and protected members of Parallel are thread-safe and may be used concurrently from multiple threads.

See Also