internal static int CountMediaItems(IOwinContext context, ISet <Guid> necessaryMIATypes, IFilter filter = null)
        {
            Guid?   user         = ResourceAccessUtils.GetUser(context);
            IFilter searchFilter = ResourceAccessUtils.AppendUserFilter(user, filter, necessaryMIATypes);

            return(MediaLibrary.CountMediaItems(necessaryMIATypes, searchFilter, false, false));
        }