private DbSet<TEntity> _entities;
      /// <summary>
            /// Get entity by identifier
            /// </summary>
            /// <param name="id">Identifier</param>
            /// <returns>Entity</returns>
            public virtual TEntity GetById(object id)
            {
                return Entities.Find(id);
            }




 /// <summary>
        /// Get entity by identifier
        /// </summary>
        /// <param name="id">Identifier</param>
        /// <returns>Entity</returns>
        public virtual List<TEntity> GetByIds(int id[])
        {
               // want to make it generic
            return Entities.Where(x=>id.Contains(id));
        }

    /// <summary>
        /// Gets an entity set
        /// </summary>
        protected virtual DbSet<TEntity> Entities
        {
            get
            {
                if (_entities == null)
                    _entities = _context.Set<TEntity>();

                return _entities;
            }
        }

Entities.Where(x=>id.Contains(id));