Parallel Class

Reference

Definition

Namespace:: System.Threading.Tasks

Assembly:: System.Threading.Tasks.Parallel.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: Parallel.cs

Source:: Parallel.cs

Source:: Parallel.cs

Important

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Provides support for parallel loops and regions.

public ref class Parallel abstract sealed

public static class Parallel

type Parallel = class

Public Class Parallel

Inheritance: Object
Parallel

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>)	Executes a `for` loop in which iterations may run in parallel and the state of the loop can be monitored and manipulated.
For(Int32, Int32, Action<Int32>)	Executes a `for` loop in which iterations may run in parallel.
For(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.
For(Int32, Int32, ParallelOptions, Action<Int32>)	Executes a `for` loop in which iterations may run in parallel and loop options can be configured.
For(Int64, Int64, Action<Int64,ParallelLoopState>)	Executes a `for` 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>)	Executes a `for` loop with 64-bit indexes in which iterations may run in parallel.
For(Int64, Int64, ParallelOptions, Action<Int64,ParallelLoopState>)	Executes a `for` 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>)	Executes a `for` loop with 64-bit indexes in which iterations may run in parallel and loop options can be configured.
For<TLocal>(Int32, Int32, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)	Executes a `for` 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>(Int32, Int32, ParallelOptions, Func<TLocal>, Func<Int32,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)	Executes a `for` 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>(Int64, Int64, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)	Executes a `for` 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.
For<TLocal>(Int64, Int64, ParallelOptions, Func<TLocal>, Func<Int64,ParallelLoopState,TLocal,TLocal>, Action<TLocal>)	Executes a `for` 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.
ForAsync<T>(T, T, CancellationToken, Func<T,CancellationToken,ValueTask>)	Executes a for loop in which iterations may run in parallel.
ForAsync<T>(T, T, Func<T,CancellationToken,ValueTask>)	Executes a for loop in which iterations may run in parallel.
ForAsync<T>(T, T, ParallelOptions, Func<T,CancellationToken,ValueTask>)	Executes a for loop in which iterations may run in parallel.
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>(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>, 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>(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>(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,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>(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>(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>(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>(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>(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>, 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.
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>, 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>(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>(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>(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>(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>, 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>(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.
ForEachAsync<TSource>(IAsyncEnumerable<TSource>, CancellationToken, Func<TSource,CancellationToken,ValueTask>)	Executes a `for-each` operation on an IEnumerable<T> in which iterations may run in parallel.
ForEachAsync<TSource>(IAsyncEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask>)	Executes a `for-each` operation on an IEnumerable<T> in which iterations may run in parallel.
ForEachAsync<TSource>(IAsyncEnumerable<TSource>, ParallelOptions, Func<TSource,CancellationToken,ValueTask>)	Executes a `for-each` operation on an IEnumerable<T> in which iterations may run in parallel.
ForEachAsync<TSource>(IEnumerable<TSource>, CancellationToken, Func<TSource,CancellationToken,ValueTask>)	Executes a `for-each` operation on an IEnumerable<T> in which iterations may run in parallel.
ForEachAsync<TSource>(IEnumerable<TSource>, Func<TSource,CancellationToken,ValueTask>)	Executes a `for-each` operation on an IEnumerable<T> in which iterations may run in parallel.
ForEachAsync<TSource>(IEnumerable<TSource>, ParallelOptions, Func<TSource,CancellationToken,ValueTask>)	Executes a `for-each` operation on an IEnumerable<T> in which iterations may run in parallel.
Invoke(Action[])	Executes each of the provided actions, possibly in parallel.
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.

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