Parallel.Invoke 方法

参考

定义

命名空间:: System.Threading.Tasks

程序集:: System.Threading.Tasks.Parallel.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

尽可能并行执行提供的每个操作。

重载

Invoke(Action[])	尽可能并行执行提供的每个操作。
Invoke(ParallelOptions, Action[])	执行所提供的每个操作，而且尽可能并行运行，除非用户取消了操作。

Invoke(Action[])

尽可能并行执行提供的每个操作。

public:
 static void Invoke(... cli::array <Action ^> ^ actions);

public static void Invoke (params Action[] actions);

static member Invoke : Action[] -> unit

Public Shared Sub Invoke (ParamArray actions As Action())

参数

actions: Action[]

要执行的 Action 数组。

例外

ArgumentNullException

actions 参数为 null。

AggregateException

当 actions 数组中的任何操作引发异常时引发的异常。

ArgumentException

actions数组包含 null 个元素。

示例

此示例演示如何将该方法与其他方法、匿名委托和 lambda 表达式配合使用 Invoke 。

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/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);
        }
    }

Imports System.Threading
Imports System.Threading.Tasks

Module InvokeDemo

    ' 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/library/dd783942(VS.100).aspx
    Private Sub Main()
        Try
            ' Param #0 - static method
            Parallel.Invoke(AddressOf BasicAction,
                            Sub()
                                ' Param #1 - lambda expression
                                Console.WriteLine("Method=beta, Thread={0}", Thread.CurrentThread.ManagedThreadId)
                            End Sub,
                            Sub()
                                ' Param #2 - in-line delegate
                                Console.WriteLine("Method=gamma, Thread={0}", Thread.CurrentThread.ManagedThreadId)
                            End Sub)
        Catch e As AggregateException
            ' 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.
            Console.WriteLine("An action has thrown an exception. THIS WAS UNEXPECTED." & vbLf & "{0}", e.InnerException.ToString())
        End Try
    End Sub

    Private Sub BasicAction()
        Console.WriteLine("Method=alpha, Thread={0}", Thread.CurrentThread.ManagedThreadId)
    End Sub



End Module

注解

此方法可用于执行一组可能并行的操作。

无法保证操作的执行顺序或操作是否并行执行。此方法不会返回，直到每个提供的操作都已完成，无论是否由于正常终止或异常终止而完成。

有关详细信息，请参阅如何：使用 Parallel.Invoke 来执行并行操作。

适用于

Invoke(ParallelOptions, Action[])

执行所提供的每个操作，而且尽可能并行运行，除非用户取消了操作。

public:
 static void Invoke(System::Threading::Tasks::ParallelOptions ^ parallelOptions, ... cli::array <Action ^> ^ actions);

public static void Invoke (System.Threading.Tasks.ParallelOptions parallelOptions, params Action[] actions);

static member Invoke : System.Threading.Tasks.ParallelOptions * Action[] -> unit

Public Shared Sub Invoke (parallelOptions As ParallelOptions, ParamArray actions As Action())

参数

parallelOptions: ParallelOptions

一个对象，用于配置此操作的行为。

actions: Action[]

要执行的操作数组。

例外

OperationCanceledException

CancellationToken 处于 parallelOptions 设置。