定义事件

#region Events

        public delegate void RespondEventHandler(ApproveReject sender, EventArgs e);

        /// <summary>
        ///  提交前事件
        /// </summary>
        public event RespondEventHandler BeforeRespond;
        private void OnBeforeRespond(EventArgs e)
        {
            if (BeforeRespond != null)
            {
                BeforeRespond(this, e);
            }
        }
        /// <summary>
        /// 提交后事件
        /// </summary>
        public event RespondEventHandler Responded;
        private void OnResponded(EventArgs e)
        {
            if (Responded != null)
            {
                Responded(this, e);
            }
        }

#endregion