Func<T>.BeginInvoke 使用线程池吗?

问题描述

当您在 C# 中调用 Func 委托(或相关的 Action 委托)上的 BeginInvoke 方法时，运行时是使用 ThreadPool 还是生成新线程?

When you call the BeginInvoke method on a Func delegates (or the Action delegates for that matter) in C#, does the runtime use the ThreadPool or spawn a new thread?

我几乎可以肯定它会使用 ThreadPool，因为这是合乎逻辑的做法，但如果有人能证实这一点，我将不胜感激.

I'm almost certain that it'll use the ThreadPool as that'd be the logical thing to do but would appreciate it if someone could confirm this.

谢谢，

推荐答案

肯定是用线程池的.

如果我能找到文档，我会感到震惊，请注意... 这篇 MSDN 文章 表明您指定的任何 回调 都将在线程池线程上执行...

I'm blowed if I can find that documented anyway, mind you... this MSDN article indicates that any callback you specify will be executed on a thread-pool thread...

这里有一些代码可以确认它 - 但当然这并不能确认它保证会以这种方式发生......

Here's some code to confirm it - but of course that doesn't confirm that it's guaranteed to happen that way...

using System;
using System.Threading;

public class Test
{
    static void Main()
    {
        Action x = () => 
            Console.WriteLine(Thread.CurrentThread.IsThreadPoolThread);

        x(); // Synchronous; prints False
        x.BeginInvoke(null, null); // On the thread-pool thread; prints True
        Thread.Sleep(500); // Let the previous call finish
    }
}

如下面的 Jeff 所链接，这篇 MSDN 文章 证实它:

As linked by Jeff below, this MSDN article confirms it:

如果调用了 BeginInvoke 方法，公共语言运行时 (CLR)将请求排队并返回立即给来电者.目标方法在 a 上异步调用线程池中的线程.

If the BeginInvoke method is called, the common language runtime (CLR) queues the request and returns immediately to the caller. The target method is called asynchronously on a thread from the thread pool.

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