/// <summary>
        /// 删除权限
        /// </summary>
        /// <param name="authorityId">权限Id</param>
        public void RemoveAuthority(Guid authorityId)
        {
            Authority authority = this._unitOfWork.Resolve <Authority>(authorityId);

            //清空关系
            authority.ClearRoleRelations();
            authority.ClearMenuRelations();

            this._unitOfWork.RegisterRemove(authority);
            this._unitOfWork.Commit();
        }