GridView加入CheckBox实现全选，跨页CheckBox选择

Question

求助：
   怎么实现记住上一页勾选的记录；；；默认选中！！

Answer 1

        #region 记录CheckBox状态        //声明一个Dictionary（并将其表明为ViewState属性），
        //其中Key值（string）代表User的ID（数据库中的主键），Value值（bool）表示该行的CheckBox是否选中
        public Dictionary<string, bool> CheckBoxState
        {
            get
            {
                return (ViewState["CheckBoxState"] != null) ? (Dictionary<string, bool>)ViewState["CheckBoxState"] : null;
            }
            set
            {
                ViewState["CheckBoxState"] = value;
            }
        }        public T03_OrderInfoCollection Orders
        {
            get
            {
                return (Session["Collections"] != null) ? (T03_OrderInfoCollection)(Session["Collections"]) : null;
            }
            set
            {
                Session["Collections"] = value;
            }
        }        //初始化Dictionary
        protected Dictionary<string, bool> InitializeUsersDic(T03_OrderInfoCollection collections)
        {
            Dictionary<string, bool> currentDic = new Dictionary<string, bool>();
            //将集合中的主键内容存储到Dictionary中 
            foreach (T03_OrderInfo collection in collections)
            {
                currentDic.Add(collection.OrderInfoNum, false);
            }
            return currentDic;
        }        #endregion
 protected void gvOrderInfo_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            //记录分页前的CheckBox状态
            Pagination.RememberOldValues(CheckBoxState, this.gvOrderInfo);            this.gvOrderInfo.PageIndex = e.NewPageIndex;
            this.gvOrderInfo.DataSource = Orders;
            this.gvOrderInfo.DataBind();            //给绑定完成的页面CheckBox赋值
            Pagination.RePopulateValues(CheckBoxState, this.gvOrderInfo);
        }public class Pagination
    {
        //记录分页的前一页CheckBox的状态       
        public static void RememberOldValues(Dictionary<string, bool> dic, GridView gdv)
        {
            foreach (GridViewRow row in gdv.Rows)
            {
                Label lblId = row.FindControl("lblId") as Label;
                CheckBox currentCbx = row.FindControl("chkIsDefault") as CheckBox;
                string currentValue = lblId.Text;
                if (currentCbx.Checked && dic[currentValue] == false)
                {
                    dic[currentValue] = true;
                }
                else if (!currentCbx.Checked && dic[currentValue] == true)
                {
                    dic[currentValue] = false;
                }
            }
        }        //给分页完毕的ChecxBox赋值
        public static void RePopulateValues(Dictionary<string, bool> dic, GridView gdv)
        {
            foreach (GridViewRow row in gdv.Rows)
            {
                Label lblId = row.FindControl("lblId") as Label;
                CheckBox currentCbx = row.FindControl("chkIsDefault") as CheckBox;
                string currentValue = lblId.Text;
                if (dic[currentValue] == true)
                {
                    currentCbx.Checked = true;
                }
                else
                {
                    currentCbx.Checked = false;
                }
            }
        }    }

Answer 2

第一次数据绑定给列表的时候要初始化
//初始化所有数据的CheckBox状态为false
CheckBoxState = InitializeUsersDic(collections);