其实，任务的启动的，只要你拨打的DoWork ;当你等待它们，你的整理的任务。

Actually, the tasks start as soon as you call DoWork; when you await them, you are finishing the tasks.

节流任务的一个选择是SemaphoreSlim$c$c>,你可以这样使用：

One option for throttling tasks is SemaphoreSlim, which you can use as such:

private SemaphoreSlim _mutex = new SemaphoreSlim(3);
public async Task DoWorkAsync()
{
  await _mutex.WaitAsync();
  try
  {
    ...
  }
  finally
  {
    _mutex.Release();
  }
}

另一种选择是使用一个实际的队列，像ActionBlock<T>$c$c>,它有内置的限制支持。

Another option is to use an actual queue, like an ActionBlock<T>, which has built-in throttling support.