C＃与线程池Execute方法（使用参数）

问题描述

我们有（此代码的想法本网站上被发现）以下的一段代码，这将产生新的线程的方法Do_SomeWork（）。 。这使我们能够异步多次运行方式

We have the following piece of code (idea for this code was found on this website) which will spawn new threads for the method "Do_SomeWork()". This enables us to run the method multiple times asynchronously.

中的代码是：

    var numThreads = 20;
    var toProcess = numThreads;

    var resetEvent = new ManualResetEvent(false);

    for (var i = 0; i < numThreads; i++)
    {
        new Thread(delegate()
        {
            Do_SomeWork(Parameter1, Parameter2, Parameter3);
            if (Interlocked.Decrement(ref toProcess) == 0) resetEvent.Set();
        }).Start();
    }

    resetEvent.WaitOne();

不过，我们想利用线程池，而不是创造我们自己的新主题，可以是有害的性能。现在的问题是我们如何可以修改上面的代码使用线程池的同时要注意方法Do_SomeWork多个参数，也有一个返回类型（即方法不是void）。

However we would like to make use of ThreadPool rather than create our own new threads which can be detrimental to performance. The question is how can we modify the above code to make use of ThreadPool keeping in mind that the method "Do_SomeWork" takes multiple parameters and also has a return type (i.e. method is not void).

此外，这是C＃2.0。

Also, this is C# 2.0.

推荐答案

几乎相同的方式，但使用WaitCallback传递给ThreadPool.QueueUserWorkItem：

Pretty much the same way, but use a WaitCallback passed to ThreadPool.QueueUserWorkItem:

var numThreads = 20;
var toProcess = numThreads;

var resetEvent = new ManualResetEvent(false);

for (var i = 0; i < numThreads; i++)
{
    ThreadPool.QueueUserWorkItem (
        new WaitCallback(delegate(object state) {
        Do_SomeWork(Parameter1, Parameter2, Parameter3);
        if (Interlocked.Decrement(ref toProcess) == 0) resetEvent.Set();
    }), null);
}

resetEvent.WaitOne();

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