/// <summary>
        /// Refresh cached data.
        /// </summary>
        /// <param name="userContext">User context.</param>
        protected override void RefreshCache(IUserContext userContext)
        {
            lock (PictureRelationDataTypes)
            {
                PictureRelationDataTypes.Clear();
            }

            lock (PictureRelationTypes)
            {
                PictureRelationTypes.Clear();
            }
        }
        /// <summary>
        /// Get picture relation types for specified locale.
        /// </summary>
        /// <param name="locale">The locale.</param>
        /// <returns>Picture relation types for specified locale.</returns>
        protected override PictureRelationTypeList GetPictureRelationTypes(ILocale locale)
        {
            PictureRelationTypeList pictureRelationTypes = null;

            lock (PictureRelationTypes)
            {
                if (PictureRelationTypes.ContainsKey(locale.ISOCode))
                {
                    pictureRelationTypes = (PictureRelationTypeList)(PictureRelationTypes[locale.ISOCode]);
                }
            }

            return(pictureRelationTypes);
        }