异步执行限制并发实例数 [英] Async execution limiting the number of concurrent instances

问题描述

我有一个简单的集合，我这样循环：

  foreach（MyObject mo in myObjects）
 {
 myObject.RunAcync（）; 
} 
  

RunAsync 在单独的线程中，使用 new Thread（（）=> {..}）。Start（），不能更改< $ c> RunAsync 。我需要限制 myObject 同时运行到N（实数为2..10）的实例数。使用 .NET4 和 c＃？

的有效方法是什么如果你可以修改 RunAsync ，我们现在有什么（.NET 4）和什么是迫在眉睫的你会想到它，.NET 4.5），我会使用任务并行库（TPL）并从 RunAsync返回某种类型的任务 code>。然后，您可以轻松地知道所做的和正在运行的内容，并使用内置的TPL负载平衡来限制正在运行的任务的数量。或者，如果您有非异步版本的方法，您还可以使用TPL的 Parallel.ForEach 调用该方法，它将处理负载均衡，并一次只运行足够的方法以避免性能问题

I have a simple collection which I'm looping through like this:

foreach (MyObject mo in myObjects)
{
   myObject.RunAcync();
}

RunAsync executes code in a separate thread, using new Thread(()=>{ .. }).Start(), it's not in my power to change the code of RunAsync. I need to limit the number of instances of myObject running concurrently to N (real numbers are 2..10). What is the efficient way to do that using .NET4 and c#?

解决方案

If you can modify RunAsync, with what we have now (.NET 4) and what's imminent (now when you think about it, .NET 4.5), I would use the Task Parallel Library (TPL) and return some sort of Task object from RunAsync. You can then easily tell what is done and what is running, and use the built-in TPL load balancing to limit the number of running tasks. Alternatively, if you had a non-async version of the method, you could also use the TPL's Parallel.ForEach to invoke the method and it would deal with load-balancing and run only enough of the methods at one time to avoid performance issues

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