Edit link passing null value when click on that link

Mahesh Bodepudi

Hi,

In my view code I have written code for editing a record

@Html.ActionLink("Edit", "Edit","PO", new { id = item.Sl_No }) |

@Html.ActionLink("Details", "Details", new { id = item.Tracking })

@item.Tracking

@item.Project_No

@item.Project_Phase

@item.Project_No_Description

@item.Requester

@item.Date_Requested

When loading the data I am able to see the fields mentioned in the script,

But In controller code

public ActionResult Edit(int SlNo)

{

var viewModel = new POViewModel();

viewModel.Order = PODb.orders.Single(x => x.Sl_No == SlNo);

viewModel.Order = (order)PODb.orders.Where(x => x.Sl_No == SlNo);

return View(viewModel);

}

Here In the above code I am getting the parameter value as null as it is throwing the below exception

The parameters dictionary contains a null entry for parameter 'SlNo' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult Edit(Int32)' in 'PurchaseOrder.Controllers.POController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters"

Could any one please help me how to rectify this one?

Know the answer? Post it — somebody with the same question will find it here.

Mayank9y ago
@Html.ActionLink("Edit", "Edit","PO", new { id = item.Sl_No })

public ActionResult Edit(int id)
{
var viewModel = new POViewModel();
viewModel.Order = PODb.orders.Single(x => x.Sl_No == SlNo);
viewModel.Order = (order)PODb.orders.Where(x => x.Sl_No == SlNo);
return View(viewModel);
}

name of parameter in action should be match with parameter in action link.

If it resolve your issue please mark as answer.
Dilip Gupta9y ago
Wrilte method like this

public ActionResult Edit(int id)
Rajeesh Menoth9y ago
Hi,

Change the default route in route config. In MapRoute you should add the optional parameter id.

Example :
routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
Reference :
http://stackoverflow.com/questions/23245365/mvc-the-parameters-dictionary-contains-a-null-entry-for-parameter-k-of-non-n
Mahesh Bodepudi9y ago
Hello Dilip,
Actually when binding the grid the values are loded,but when passing the value only I am getting the problem
Dilip Gupta9y ago
Have you check model class ,whether you get Sl_No value in model
Fabio Silva Lima9y ago
Have you tried to use nullable int? SlNo value on your parameter?
public ActionResult Edit(int? SlNo)
{
var viewModel = new POViewModel();
viewModel.Order = PODb.orders.Single(x => x.Sl_No == SlNo);
viewModel.Order = (order)PODb.orders.Where(x => x.Sl_No == SlNo);
return View(viewModel);
}