public CrawlerBase()
 {
     if (IP != null)
     {
         _iPnets = IP.Select(i => IPNetwork.Parse(i)).ToArray();
     }
     if (UserAgent != null)
     {
         _userAgents = UserAgent.Select(s => s.ToLower()).ToArray();
     }
     if (HostName != null)
     {
         _hostNames = HostName.Select(s => s.ToLower()).ToArray();
     }
 }