Question

我理解,这个问题在StackOverflow上也存在类似问题,但没有任何问题解决了我的问题,因此产生了一个新的问题。

如标题所示,在用户复读一页时,我想发现。我有一页,可以节省一些关于用户所做工作的记录信息(如添加、删除或替换物品)。只有当用户离开网页时,而不是通过更新这一记录,才能保存这一记录。

我尝试了以下例子,以发现它是否再次提出或提出新的要求:

public ActionResult Index()
{
   var Model = new Database().GetLogInfo();
   var state = TempData["refresh"];

   if(state == null)
   {
    //This is a mock structure
    Model.SaveLog(params);
   }


TempData["refresh"] = true; //it can be anything here

return View();
}

Considering it s a TempData it should expire on my next action. However, it s surviving the entire application for some reason. According to this blog it should expire on my subsequent request (unless i m not understandig something). Even if i log out from my app and log in again, my TempData is still alive.

I ve been thinking about use the javascript function onbeforeunload to make an AJAX call to some action, but once again i d have to rely on TempData or to persist this refresh info somehow. Any tips?

Answer 1

You can use a ActionFilter that looks something like this:

public class RefreshDetectFilter : IActionFilter
{
    public void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var cookie = filterContext.HttpContext.Request.Cookies["RefreshFilter"];
        filterContext.RouteData.Values["IsRefreshed"] = cookie != null &&
                                                        cookie.Value == filterContext.HttpContext.Request.Url.ToString();
    }
    public void OnActionExecuted(ActionExecutedContext filterContext)
    {
        filterContext.HttpContext.Response.SetCookie(new HttpCookie("RefreshFilter", filterContext.HttpContext.Request.Url.ToString()));
    }
}

Register it in global.asax. Then you can just do this in your controller:

if (RouteData.Values["IsRefreshed"] == true)
{
    // page has been refreshed.
}

您不妨改进探测工作,以检查所采用的吉大港定居地保有权方法(作为《长期就业法》和《全球就业法》的参考)。请注意,它使用ok进行检测。

Answer 2

If you are using MVC 2 or 3 then the TempData does not expire on the subsequent request, but on the next read.

http://robertcorvus.com/warning-mvc-nets-tempdata-now-persists-across-screens/

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