彻底解决刷新重复提交问题

以前也研究过,始终没找到好的办法,看了微软Msdn上的解决方案,使用后发现存在较多漏洞,考虑的情况太少,如页面加载后没有提交,始终刷新,在同一浏览器打开多个各选项卡,每个选项卡打开同一页面或不同页面,以下是我的解决方案,
public class RefreshServe : System.Web.UI.Page
    {
        private static ILog log = LogManager.GetLogger(typeof(RefreshServe));

        private readonly string REFRESH_TICKET_NAME = "__RefreshTicketArray";
        private readonly string HIDDEN_FIELD_NAME = "__RefreshHiddenField";
        private readonly string HIDDEN_PAGE_GUID = "__RefreshPageGuid";

        /// <summary>
        /// 为True表示页面刷新,False为正常提交
        /// </summary>
        public bool IsPageRefreshed
        {
            get
            {
                if (IsPostBack && !CheckRefreshFlag())
                {
                    log.Debug("刷新了页面");
                    return true;
                }
                else
                {
                    log.Debug("正常提交");
                    return false;
                }
            }
        }

        /// <summary>
        /// 呈现前更新标识
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPreRender(EventArgs e)
        {
            log.Debug("执行OnPreRender");
            base.OnPreRender(e);
            UpdateRefreshFlag();
        }


        /// <summary>
        /// 更新标识,正常提交都删除该次提交的时间,并生产当前新的时间
        /// </summary>
        private void UpdateRefreshFlag()
        {

            #region Session模式

            ////设置页面唯一标识
            //SetCurPageGuid();

            //DataTable RefreshSign = GetRefreshSession();
            //string pageGuid = GetCurPageGuid();
            //DataRow newRow;

            //if (RefreshSign.Rows.Count > 0)
            //{
            //    DataRow[] existRow = RefreshSign.Select("GUID='none'");
            //    if (existRow.Length > 0)
            //    {
            //        foreach (DataRow row in existRow)
            //            row.Delete();
            //        log.Debug("找到为none标识的行并删除");
            //    }

            //    existRow = RefreshSign.Select("GUID='" + pageGuid + "'");
            //    if (existRow.Length > 0)
            //    {
            //        foreach (DataRow row in existRow)
            //            row.Delete();
            //        log.Debug("找到为" + pageGuid + "标识的行并删除");
            //    }
            //}

            //string submitTime = DateTime.Now.ToString("hhmmss.fffff");
            ////当前提交时间保存到隐藏域
            //ClientScript.RegisterHiddenField(HIDDEN_FIELD_NAME, submitTime);


            ////同时添加到DataTable列表中
            //newRow = RefreshSign.NewRow();
            //newRow["submitTime"] = submitTime;
            //newRow["GUID"] = pageGuid;
            //log.Debug("即将要新增的票证:submitTime:" + submitTime + "  Guid:" + pageGuid.ToString());
            //RefreshSign.Rows.Add(newRow);

            //log.Debug("UpdateRefreshFlag中当前DataTable中存在的记录数为:" + RefreshSign.Rows.Count);
            //foreach (DataRow row in RefreshSign.Rows)
            //{
            //    log.Info("row['submitTime']:" + row["submitTime"] + "    row['GUID']:" + row["GUID"]);
            //}
            #endregion

            #region Cookie模式

            //注册页面唯一标识并返回
            string pageGuid = SetCurPageGuid();

            HttpCookie cookie = GetRefreshTicket();
          
            if (cookie.Values.Count > 0)
            {
                cookie.Values.Remove(pageGuid);
                log.Debug("当前清除的cookie变是:" + pageGuid);
            }

            string submitTime = DateTime.Now.ToString("hhmmss.fffff");
            //当前提交时间保存到隐藏域
            ClientScript.RegisterHiddenField(HIDDEN_FIELD_NAME, submitTime);


            log.Debug("即将要新增的时间:submitTime:" + submitTime + "  Guid:" + pageGuid.ToString());
            cookie.Values.Add(pageGuid, submitTime);

            log.Debug("UpdateRefreshFlag中当前Cookie中存在的记录数为:" + cookie.Values.Count);
            for (int i = 0; i < cookie.Values.Count; i++)
                log.Info("cookie[" + cookie.Values.GetKey(i) + "]:" + cookie.Values[i]);

            Response.AppendCookie(cookie);

            #endregion

        }


        /// <summary>
        /// 验证是否刷新
        /// </summary>
        /// <returns></returns>
        private bool CheckRefreshFlag()
        {
            #region Session模式
            //DataTable RefreshSign = GetRefreshSession();

            //if (RefreshSign.Rows.Count == 0)//第一次访问页面
            //{
            //    log.Debug("第一次访问页面");
            //    return true;
            //}
            //else
            //{
            //    bool flag = RefreshSign.Rows.IndexOf(RefreshSign.Rows.Find(GetCurSubmitTime())) > -1;//当前提交时间是否存在
            //    if (flag)
            //        log.Debug("提交时间存在");
            //    else
            //        log.Debug("无效的提交时间");
            //    return flag;
            //}
            #endregion

            HttpCookie cookie = GetRefreshTicket();
            string pageGuid = GetCurPageGuid();
            if (cookie.Values.Count > 0)
            {
                bool flag;
                if (cookie.Values[pageGuid] != null)
                    flag = cookie.Values[pageGuid].IndexOf(GetCurSubmitTime()) > -1;
                else
                    flag = true;//防止出现异常,总是可以提交
                if (flag)
                    log.Debug("提交时间存在,可以提交");
                else
                    log.Debug("无效的提交时间");
                return flag;
            }
            return true;
        }


        /// <summary>
        /// 得到已保存的提交时间,没有新建,有返回
        /// </summary>
        /// <returns></returns>
        private HttpCookie GetRefreshTicket()
        {
            #region Session模式,返回值改为DataTable

            //DataTable RefreshSession;
            //if (Session[REFRESH_TICKET_NAME] == null)
            //{
            //    RefreshSession = new DataTable("RefreshSession");
            //    DataColumn newColumn;

            //    newColumn = new DataColumn("submitTime", System.Type.GetType("System.String"));
            //    RefreshSession.Columns.Add(newColumn);

            //    DataColumn[] columnArray = new DataColumn[1];
            //    columnArray[0] = newColumn;
            //    RefreshSession.PrimaryKey = columnArray;


            //    newColumn = new DataColumn("GUID", System.Type.GetType("System.String"));
            //    RefreshSession.Columns.Add(newColumn);

            //    Session[REFRESH_TICKET_NAME] = RefreshSession;

            //    log.Debug("Session不存在，初始化");
            //}
            //else
            //{
            //    RefreshSession = Session[REFRESH_TICKET_NAME] as DataTable;

            //    log.Debug("读取已存在的Session,当前DataTable中存在的记录数为:" + RefreshSession.Rows.Count);
            //    foreach (DataRow row in RefreshSession.Rows)
            //    {
            //        log.Info("row['submitTime']:" + row["submitTime"] + "    row['GUID']:" + row["GUID"]);
            //    }             
            //}          
            //return RefreshSession;
            #endregion

            #region Cookie模式,返回值为Cookie

            HttpCookie cookie;
            if (Request.Cookies[REFRESH_TICKET_NAME] == null)
            {
                cookie = new HttpCookie(REFRESH_TICKET_NAME);
                Response.AppendCookie(cookie);
                log.Debug("Cookie不存在，初始化");
            }
            else
            {
                cookie = Request.Cookies[REFRESH_TICKET_NAME];

                log.Debug("读取已存在的Cookie,当前Cookie中存在的记录数为:" + cookie.Values.Count + "具体有如下几条:");

                for (int i = 0; i < cookie.Values.Count; i++)
                    log.Info("cookie[" + cookie.Values.GetKey(i) + "]:" + cookie.Values[i]);
            }
            return cookie;
            #endregion
        }


        /// <summary>
        /// 获取当前提交时间
        /// </summary>
        /// <returns></returns>
        private string GetCurSubmitTime()
        {
            string submitTime = Request.Params[HIDDEN_FIELD_NAME] == null ? "" : Request.Params[HIDDEN_FIELD_NAME].ToString();
            log.Debug("执行GetCurSubmitTime:submitTime为:" + submitTime);
            return submitTime;
        }


        /// <summary>
        /// 设置页面唯一标识,通过Guid标识来区分每个页面自己的提交时间
        /// </summary>
        private string SetCurPageGuid()
        {
            string guid;
            if (!IsPostBack)
            {
                if (Request.Params[HIDDEN_PAGE_GUID] == null)
                {
                    guid = System.Guid.NewGuid().ToString();
                    log.Debug("SetCurPageGuid注册了一个新的标识:" + guid);
                }
                else
                    guid = GetCurPageGuid();

            }
            else
            {
                guid = GetCurPageGuid();              
            }

            ClientScript.RegisterHiddenField(HIDDEN_PAGE_GUID, guid);
            return guid;
        }



        /// <summary>
        /// 得到当前页面的唯一标识
        /// </summary>
        /// <returns></returns>
        private string GetCurPageGuid()
        {
            string pageGuid = Request.Params[HIDDEN_PAGE_GUID] == null ? "none" : Request.Params[HIDDEN_PAGE_GUID].ToString();
            log.Debug("执行GetCurPageGuid()后Page_GUID为:" + pageGuid);
            return pageGuid;
        }

需要刷新判断功能时新页面只需继续该类就可,通过引用属性IsPageRefreshed识别"为真表示刷新,假则是正常提交",将数据库的操作写在
if(!IsPageRefreshed)
{
   数据库操作
}
即可,如果是刷新不会执行,代码中注释部分使用的是Session方式保存票证,因为session比较容易丢失且占内存,所以使用cookie,