public async Task <IActionResult> AddNotificationList(IEnumerable <UserNotificationDTO> userNotifications)
{
IEnumerable <UserNotificationDTO> AddedUserNotifications;
try
{
AddedUserNotifications = await _notificationService.AddListUserNotificationAsync(userNotifications);
}
catch (InvalidOperationException)
{
return(BadRequest());
}
var tasks = GetOnlineUserFromList(AddedUserNotifications).Select(un => SendPrivateNotification(un));
await Task.WhenAll(tasks);
return(NoContent());
}