private Task InternalScheduleOnce(int initialDelayMs, Action action, CancellationToken token)
{
if (initialDelayMs == Timeout.Infinite)
{
return(TaskExt.CreateInfiniteTask());
}
if (initialDelayMs <= 0)
{
action();
return(TaskExt.CreateCompletedTask());
}
return(Task.Delay(initialDelayMs, token).Then(t => action()));
}
