private static DataDictCache _Cache = null;

        /// <summary>
        /// 缓存数据唯一实例
        /// </summary>
        public static DataDictCache Cache
        {
            get
            {
                if (_Cache == null) _Cache = new DataDictCache();
                return _Cache;
            }
        }

/// <summary>
        /// 区域资料
        /// </summary>
        public DataTable Region
        {
            get
            {
                DataTable dt = FindFromCache("C_area");
                if (dt == null)
                {
                    dt = CommonData.GetArea();
                    AddToCache(dt.Copy());
                }
                return dt;
            }
        }

/// <summary>
        /// 用户资料
        /// </summary>
        public DataTable User
        {
            get
            {
                DataTable dt = FindFromCache(sys_User._TableName);
                if (dt == null)
                {
                    dt = CommonData.GetUsers();
                    AddToCache(dt.Copy());
                }
                return dt;
            }

        }