How can I insert a delay between a List of Task<int>?

问题

I have a loop that creates 5 Tasks. How can I insert a Delay of 5 seconds between each Task. I don't know how to fit Task.Delay(5000) in there.

 var tasks = new List<Task<int>>();

 for (var i = 0; i < 5; i++)
 {  
      tasks.Add(ProcessQueueAsync());
 }

 await Task.WhenAll(tasks);

My ProcessQueAsync method calls a server, retrieves data and returns and int.

  private async Task<int> ProcessQueAsync()
  {
     var result = await CallToServer();
     return result.Count;
  }

回答1:

 for (var i = 0; i < 5; i++)
 {  
      tasks.Add(ProcessQueueAsync());
      await Task.Delay(5000);
 }

Or:

 for (var i = 0; i < 5; i++)
 {  
      await ProcessQueueAsync();
      await Task.Delay(5000);
 }

Depending on that you want.

回答2:

If you want the tasks to run one after the other, with a 5 second delay, you should perhaps look at Task.ContinueWith instead of using Task.WhenAll. This would allow you to run tasks in serial rather than in parallel.

来源：https://stackoverflow.com/questions/28996680/how-can-i-insert-a-delay-between-a-list-of-taskint