有ThreadPool.QueueUserWorkItem和委托的BeginInvoke之间的差异 [英] is there a difference between ThreadPool.QueueUserWorkItem and delegate BeginInvoke

问题描述

我需要做的计算（我用.NET 4）高效（使用线程尽可能少的），异步方式。
一种方法是

I need efficient (using fewest threads possible) asynchronous way of doing computation (and I use .net 4). One way is to

ThreadPool.QueueUserWorkItem(f => job.DoWork()); 
job.Completed += (a, b) => {...} //Completed is event I fire when work is done

另一种可能性是实现异步方法，是的 完成之前，C＃5节，这基本上是叫的BeginInvoke 的委托。

The other possibility is to implement async method as is done prior to C# v.5, which is basically calling BeginInvoke on a delegate.

我的问题是：是否有这两个比不同的语法等，因为它似乎的BeginInvoke 还使用从一个新的线程线程池之间的差异？

My question is: is there a difference between these two other than different syntax, as it seems BeginInvoke is also using a new thread from ThreadPool?

顺便说一句：这是可能的定义和同一个线程调用者的异步调用的方法（如以JavaScript完成）（在C＃的任何版本）？

As an aside: is it possible to define and call a method asynchronously on the same thread as the caller (as is done in javascript) (in any version of C#)?

推荐答案

Delegate.BeginInvoke 提出的方法是在线程池。的的BeginInvoke 的好处是，你可以使用的IAsyncResult ，可用于监视异步调用的进展。它的兄弟的方法， EndInvoke会，检索异步调用的结果。它可以被称为的BeginInvoke 之后的任何时间。如果直到它完成异步调用尚未完成， EndInvoke会阻塞调用线程。

Delegate.BeginInvoke puts that method at the ThreadPool. The advantage of BeginInvoke is that you can use the IAsyncResult, which can be used to monitor the progress of the asynchronous call. Its 'brother' method, EndInvoke, retrieves the results of the asynchronous call. It can be called any time after BeginInvoke. If the asynchronous call has not completed, EndInvoke blocks the calling thread until it completes.

请参阅： http://msdn.microsoft.com/en-us/库/ 2e08f6yc.aspx

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