public SetUrlsCommand(IUrlsProvider provider, IUrlsListener listener)
        {
            Guard.NotNull("provider", provider);
            Guard.NotNull("listener", listener);

            this.provider = provider;
            this.listener = listener;

            provider.PropertyChanged += UpdateCanExecute;
        }
 public LoadCheckService(IUrlsProvider urlsProvider, IUrlsChecker urlsChecker)
 {
     _urlsProvider = urlsProvider;
     _urlsChecker  = urlsChecker;
 }