/// <summary>
        /// 保存活动信息
        /// </summary>
        /// <param name="approvalActivity">审批活动</param>
        protected void AddApprovalActivity(Activity approvalActivity)
        {
            NHActivity activity = new NHActivity(approvalActivity);

            if (activity.Id > 0)
            {
                return;
            }
            _nHActivityDao.Save(activity);
            approvalActivity.Id = activity.Id;
        }
        /// <summary>
        /// 由Id获取审批活动实例
        /// </summary>
        /// <param name="id">审批活动Id</param>
        /// <returns></returns>
        protected Activity GetApprovalActivity(long id)
        {
            NHActivity activity = _nHActivityDao.GetById(id, false);

            return(activity.CovertTo());
        }