'NULL entry' error in MVC4 Edit view option of a MVC web application

Question

In the implemntation of a Displayview in a MVC application I am getting the NULL entry for Parameter error when I click on Edit option.

Used code for the controller is given below:

public ActionResult Edit(int ? id, ConferDetal cnfdr) 
    {
        try
        {
            using (ConBitEtities btis = new ConBitEtities())

            {
                btis.Entry(cnfdr).State = EntityState.Modified;
                btis.SaveChanges();
            }
                // TODO: Add update logic here

                return RedirectToAction("Scheduler");//view for the controller
        }
        catch
        {
            return View();
        }
    }

what is the reason for this error and how to solve this issues?

following is the routeconfig.cs code public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional } ); } — Ddevil Prasad, Feb 07 '18 at 13:23
You haven't shown us the right method there must be one that only take one parameter `Edit(int id)` it will be this one you need to make nullable `Edit(int? id)`. — Ashley Medway, Feb 07 '18 at 15:22
Thanks Ashley....Got the error....missed the Edit(int? id)!!1 — Ddevil Prasad, Feb 07 '18 at 15:27

santosh singh · Answer 1 · 2018-02-07T15:18:22.373

0

Change your route configuration as shown below

routes.MapRoute(
    "Default",
    "{controller}/{action}/{id}",
    new { controller = "Page", action = "Index", id = UrlParameter.Optional }

Make sure that your view has the following(similar) ActionLink

<%=Html.ActionLink("Edit", "ConfSchedule", new {id = "1"})%>

edited Feb 07 '18 at 15:18

answered Feb 07 '18 at 13:04

santosh singh

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its Controller not an APIController – Saineshwar Bageri - MVP Feb 07 '18 at 13:06
I have given the route configuration code for my project. Is that different? from – Ddevil Prasad Feb 07 '18 at 13:25
You are not passing id attribute so that you are getting exception – santosh singh Feb 07 '18 at 13:27
how to do that? – Ddevil Prasad Feb 07 '18 at 15:13
@Html.ValidationMessageFor(model => model.ConferenceID, "", new { @class = "text-danger" }) – Ddevil Prasad Feb 07 '18 at 15:23

score 0 · Answer 2 · answered Feb 07 '18 at 13:38

0

You are expecting an id parameter in your URL but you aren't supplying one.

answered Feb 07 '18 at 13:38

Saineshwar Bageri - MVP

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that is what i want to know...? – Ddevil Prasad Feb 07 '18 at 15:12

'NULL entry' error in MVC4 Edit view option of a MVC web application

2 Answers2