CODEWITHSUNDEEP
c#asp.net-mvc-3entity-framework
Sithelo
Sithelo

Reputation: 307

Error message on post in asp.net mvc 3

I have these two action method in my asp.net mvc application:

  public ActionResult Edit(int id)
    {
        cpd_certificates cpd_certificates = db.Certificate.Find(id);

        return View(cpd_certificates);
    }

    //
    // POST: /Home/Edit/5


   [HttpPost]
    public ActionResult Edit(cpd_certificates cpd_certificates)
    {
        if (ModelState.IsValid)
        {
            db.Entry(cpd_certificates).State = EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Details");
        }

        return View(cpd_certificates);
    }

This is how the paremeters are passed:

 @Html.ActionLink("Edit", "Edit", new {   id=item.CertificateNo  })

below is part of my view that calls those two methods above:

@model IEnumerable<onlineCPD.Models.cpd_certificates>
<table>
<tr>
    <th>
        QuizNo
    </th>
    <th>
        Received
    </th>
@foreach (var item in Model) {
<tr>
    <td>
        @Html.DisplayFor(modelItem => item.QuizNo)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.Received)
    </td>
  <td>
        @Html.ActionLink("Edit", "Edit", new {   id=item.CertificateNo  })
</td>
}

</table>

This is my route:

public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
        );

    }

This is part code for my details method.

public ActionResult Details(string sortOrder, string currentFilter, string searchString, int? page, int id)
        {
var certificateDetails = db.Certificate.Where(p => p.ID == id);
 return View(certificateDetails.ToPagedList(pageNumber, pageSize));

Now when I click save, I get this error:

The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Details(System.String, System.String, System.String, System.Nullable`1[System.Int32], Int32)' in 'onlineCPD.Controllers.HomeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters

I am suppose to pass a parameter in my post, but how do I do this and can someone explain as I just inexperienced here.

Upvotes: 0

Views: 1317

Answers (1)

testCoder
testCoder

Reputation: 7385

You should fix Edit method like this:

[HttpPost]
public ActionResult Edit(cpd_certificates cpd_certificates)
{
    if (ModelState.IsValid)
    {
        db.Entry(cpd_certificates).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Details", new { id = cpd_certificates.id });
    }

    return View(cpd_certificates);
}

In your actionlink do this:

 @Html.ActionLink("Edit", "Edit", new {   id=item.QuizNo  })

Or alternatively try to change details signature for acceptable nullable value for id, like this:

Details(string sortOrder, string currentFilter, string searchString, int? page, int? id)

Upvotes: 3

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