Edit link passing null value when click on that link

Question

Hi,

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

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

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

<td>@item.Tracking</td>

<td>@item.Project_No</td>

<td>@item.Project_Phase</td>

<td>@item.Project_No_Description</td>

<td>@item.Requester</td>

<td>@item.Date_Requested</td>

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?

Mayank · Answer

@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 Gupta · Answer

Wrilte method like this public ActionResult Edit( int id )

Rajeesh Menoth · Answer

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 Bodepudi · Answer

Hello Dilip, Actually when binding the grid the values are loded,but when passing the value only I am getting the problem

Dilip Gupta · Answer

Have you check model class ,whether you get Sl_No value in model

Fabio Silva Lima · Answer

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); }

Edit link passing null value when click on that link

Answers (6)