在用户控件属性中使用ViewState

想一次Load后，一直能够使用的全局变量，在回传的时候能够不消失。

结果每次都会重置，查找资料发现需要重写ViewState的一些操作。

        //Persist Viewstate

        protected override void LoadViewState(object savedState)

        {

            object[] viewState = (object[])savedState;

            ArrayList al = viewState[0] as ArrayList;

            if (al != null)

            {

                _formID = (int)al[0];

                _configID = (int)al[1];

                _formPeriodNo = (int)al[2];

                _planPeriodNo = (int)al[3];

                _formMonthStr = (string)al[4];

                _planMonthStr = (string)al[5];

                _webUrl = (string)al[6];

                _isInPeriod = (bool)al[7];

            }

            base.LoadViewState(viewState[1]);

        }

        protected override object SaveViewState()

        {

            if (System.Web.HttpContext.Current == null)

                return null;

            ArrayList al = new ArrayList();

            al.Add(FormID);

            al.Add(ConfigID);

            al.Add(FormPeriodNo);

            al.Add(PlanPeriodNo);

            al.Add(FormMonthStr);

            al.Add(PlanMonthStr);

            al.Add(WebUrl);

            al.Add(IsInPeriod);



            object[] viewState = new object[2];

            viewState[0] = al;

            viewState[1] = base.SaveViewState();

            return viewState;

        }