How to delay an action execution when use Task

Question

I have the following code:

Action<CancellationToken> act1 = tk1 => {
   //sleep for 5 seconds
   Console.WriteLine(...);
};

Task t1 = new Task(() => execute(act1));

t1.Start();

How to sleep inside action ? I tried with :

Thread.Sleep(TimeSpan.FromSeconds(5));

and

Task.Delay(TimeSpan.FromSeconds(5));

Answer 1

With

Task.Delay(TimeSpan.FromSeconds(5));

a new Task is created that is ran asynchronally by default. Hence your method will continue running independently from the Task. You have several option to synchronize to your Task.

If you are in an async method you can await the Task

await Task.Delay(TimeSpan.FromSeconds(5));

otherwise, you may always use Task.Wait

Task.Delay(TimeSpan.FromSeconds(5)).Wait();

this will block the method until the Task has finished running.

In your case you can make your Lambda async

Action<CancellationToken> act1 = async tk1 => {
   await Task.Delay(TimeSpan.FromSeconds(5), tk1);
   Console.WriteLine(...);
};