public ScheduledTaskService(IScheduledTaskProvider provider)
 {
     if (provider == null)
     {
         throw new ArgumentNullException(nameof(provider));
     }
     _provider = provider;
 }
 public ScheduledTaskService(IScheduledTaskProvider provider)
 {
     if (provider == null)
         throw new ArgumentNullException("provider");
     _provider = provider;
 }