//节点布撤防
 private void obj_WatchEvent(object sender, WatchEvnetArgs e)
 {
     if (null != ObjWatchEvent)
     {
         ObjWatchEvent(sender, e);
     }
 }
        /// <summary>
        /// 设置布防/撤防
        /// </summary>
        /// <param name="IsWatch">状态:true - 布防,false - 撤防</param>
        public void Watch(bool IsWatch)
        {
            //linwei 2008-07-11 在地图节点布撤防时,判断一下当前节点的Node是否为空
            if (Node != null)
            {
                //renzihao 2008-5-27 把改变图片提前
                Statue = (IsWatch) ? WatchStatue.Normal : WatchStatue.Stopped;
                //renzihao 2005-5-28 树节点改变报警状态
                ((Data.NodeInformation) Node.Tag).Watch = Statue;

                if (Statue == WatchStatue.Warning && null != ClearWarningEvent)
                {
                    EventArgs args = new EventArgs();
                    ClearWarningEvent(this, args);
                }

                if (null != WatchEvent)
                {
                    WatchEvnetArgs args = new WatchEvnetArgs();
                    args.IsWatch = IsWatch;
                    WatchEvent(this, args);
                }

                Statue = (IsWatch) ? WatchStatue.Normal : WatchStatue.Stopped;
            }
        }