防止在ASP.NET中删除记录后出现后退按钮或显示错误

本文关键字：错误 显示 按钮 记录 ASP NET 删除 | 更新日期: 2023-09-27 17:49:59

我有一个ASP。. NET MVC应用程序。

如果用户在浏览器中单击后退按钮，如何显示错误消息而不是返回视图?

例如，我有一个功能，用户可以删除日志。删除后，控制器方法将它们重定向到一个页面。这都很好。

但是，如果用户在被重定向后单击后退按钮，他们将返回到显示已删除记录的同一页面。那么，每次单击后退按钮时，如何验证以检查记录是否仍然存在呢?

关闭日志的代码是:

 public ActionResult CloseLog(int id)
 {
        var query = from log in db.Logs where log.LogID == id select log;
        foreach (Log log in query)
        {
          log.DateTimeResolved = System.DateTime.Now;
          Response response = new Response
          {
              ResponseText = "This log is now closed. Please call the Service Desk on XXXX if needed.",
              UserName = User.Identity.Name,
              DateTimeOfUpdate = System.DateTime.Now,
              LogID = log.LogID
          };
          db.Responses.Add(response);
        }
       db.SaveChanges();
       return RedirectToAction("Index", "Home"); 
    }

和我的代码查看

 public ActionResult CreateServiceRequestResponse(int? id)
    {
        if (id.HasValue)
        {
            LogID = id.Value;
        }
        var Responses = (from a in db.Responses where a.LogID == LogID select new ResponseViewModel { ResponseText = a.ResponseText, DateTimeOfUpdate = a.DateTimeOfUpdate, Username = a.UserName });
        var ServiceRequest = (from a in db.ServiceRequests where a.LogID == LogID select new ServiceRequestViewModel { RequestType = a.RequestType, AdditionalInformation = a.AdditionalInformation, EstimatedResolveDate = a.EstimatedResolveDate, LogID = a.LogID});
        ViewBag.ServiceRequestData = ServiceRequest;
        ViewBag.Data = Responses;
        return View();
    }

防止在ASP.NET中删除记录后出现后退按钮或显示错误

把它放在你认为应该进行验证的地方

var query = from log in db.Logs where log.LogID == id select log;
if (!query.Any())
{
    // Or you can have your own handler.
    throw new HttpException(404, "Page not found");
}
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