Question

I am developing a console app.

I want to use a Threadpool to perform web downloads. Here is some fake code.

 for (int loop=0; loop< 100; loop++)
 {
     ThreadPool.QueueUserWorkItem(new WaitCallback(GetPage), pageList[loop]);
 }


snip

private static void GetPage(object o)
{
    //get the page
}

How do I prevent my code from starting more than two (or ten, or whatever) simultaneous threads?

I have tried

    ThreadPool.SetMaxThreads(1, 0);
    ThreadPool.SetMinThreads(1, 0);

But they seem to have no impact.

Answer 1

I would use Parallel.For and set MaxDegreeOfParallelism accordingly.

Parallel.For(0, 1000, new ParallelOptions { MaxDegreeOfParallelism = 10 },
  i =>
  {
    GetPage(pageList[i]);
  });