Parallel.Invoke Method (Action[])

Executes each of the provided actions, possibly in parallel.

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

public static void Invoke(
	params Action[] actions
)

Parameters

actions
Type: System.Action[]

An array of Action to execute.

ExceptionCondition
ArgumentNullException

The actions argument is null.

AggregateException

The exception that is thrown when any action in the actions array throws an exception.

ArgumentException

The actions array contains a null element.

This method can be used to execute a set of operations, potentially in parallel.

No guarantees are made about the order in which the operations execute or whether they execute in parallel. This method does not return until each of the provided operations has completed, regardless of whether completion occurs due to normal or exceptional termination.

For more information, see How to: Use Parallel.Invoke to Execute Parallel Operations.

This example demonstrates how to use the Invokemethod with other methods, anonymous delegates, and lambda expressions.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

    class ParallelInvokeDemo
    {

        // Demonstrated features: 
        // 		Parallel.Invoke() 
        // Expected results: 
        // 		The threads on which each task gets executed may be different. 
        //		The thread assignments may be different in different executions. 
        //		The tasks may get executed in any order. 
        // Documentation: 
        //		http://msdn.microsoft.com/en-us/library/dd783942(VS.100).aspx 
        static void Main()
        {
            try
            {
                Parallel.Invoke(
                    BasicAction,	// Param #0 - static method
                    () =>			// Param #1 - lambda expression
                    {
                        Console.WriteLine("Method=beta, Thread={0}", Thread.CurrentThread.ManagedThreadId);
                    },
                    delegate()		// Param #2 - in-line delegate
                    {
                        Console.WriteLine("Method=gamma, Thread={0}", Thread.CurrentThread.ManagedThreadId);
                    }
                );
            }
            // No exception is expected in this example, but if one is still thrown from a task, 
            // it will be wrapped in AggregateException and propagated to the main thread. 
            catch (AggregateException e)
            {
                Console.WriteLine("An action has thrown an exception. THIS WAS UNEXPECTED.\n{0}", e.InnerException.ToString());
            }
        }

        static void BasicAction()
        {
            Console.WriteLine("Method=alpha, Thread={0}", Thread.CurrentThread.ManagedThreadId);
        }


    }

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, 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.

Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2014 Microsoft