Why the model is null in Action method in ASP.NET MVC? - asp.net-mvc

Question

my problem is that after click on button "Save", I get the model passed to controller from view is null.
Here my code of the View and Controller.
Do you know where I am doing wrong?
Thank you so much.
View Certificazioni.cshtml
#model List<ElencoCertificazioniItem>
...
#using (Html.BeginForm())
{
#Html.AntiForgeryToken()
...
<tbody>
#{
for (int i = 0; i < Model.Count; i++)
{
<tr>
<td>#Html.LabelFor(m => Model[i].Id) </td>
<td>#Html.LabelFor(m => Model[i].description)</td>
<td>#Html.EditorFor(m => Model[i].Field1.Value)</td>
<td>#Html.EditorFor(m => Model[i].Field2.Value)</td>
</tr>
}
}
</tbody>
}
....
}
Controller
[HttpPost]
[ValidateAntiForgeryToken]
[HttpParamAction]
public ActionResult SaveItems(List<ElencoCertificazioniItem> model)
{
//the items here is null!!! ;(
return saveItems(model);
}
Model
public class ElencoCertificazioniItem
{
public int Id { get; set; }
public string description { get; set; }
public bool? Field1 { get; set; }
public bool? Field2 { get; set; }
}
I use HttpParamAction to manage calls to different methods controller (I have 2 button in the same form).
public class HttpParamActionAttribute : ActionNameSelectorAttribute
{
public override bool IsValidName(ControllerContext controllerContext, string actionName, MethodInfo methodInfo)
{
if (actionName.Equals(methodInfo.Name, StringComparison.InvariantCultureIgnoreCase))
return true;
var request = controllerContext.RequestContext.HttpContext.Request;
return request[methodInfo.Name] != null;
}
}
The list is not null and contains right count elements, but the items within are null and Id properties is always 0!

Answer 1

Your ID and description will always be 0 and null because you don't use any input to post them in form. If you want return them, you have to use input hiddent to pass this values
<tr>
<td>
#Html.LabelFor(m => Model[i].Id)
#Html.HiddenFor(m => Model[i].Id)
</td>
<td>
#Html.LabelFor(m => Model[i].description)
#Html.HiddenFor(m => Model[i].description)
</td>
<td>#Html.EditorFor(m => Model[i].Field1)</td>
<td>#Html.EditorFor(m => Model[i].Field2)</td>
</tr>