ASP.NET MVC 4 - ListBoxFor, send selectedValue in ActionLink - asp.net-mvc-4

Question

I have a list of model. I want to retrieve the listBoxSelectedValue to send it in my actionLink to edit it.
This is my view :
#using (Html.BeginForm())
{
#Html.ListBoxFor(a => a.SelectedApplis, new SelectList(ViewBag.Applis,"ID","Name", Model.SelectedApplis))<br/>
#Html.ActionLink("Add","Create","Application")<br/>
#Html.ActionLink("Edit","Edit","Application", null, new { listAppId = Model.SelectedApplis})<br/>
#Html.ActionLink("Delete","Delete","Application")<br/>
}
I created a class "ListBoxApplication" with the List which will contain the selectedValue of the ListBox.
public class ListBoxApplication
{
public IEnumerable<int> SelectedApplis { get; set; }
public ListBoxApplication()
{
SelectedApplis = new List<int>();
}
}
I have 2 controllers : Application and Home
In HomeController, I created the model ListBoxApplication which contain the List. In my ViewBag.Applis, i have all my ApplicationModel.
public ActionResult Index()
{
ListBoxApplication listeApplis = new ListBoxApplication();
ViewBag.Applis = ApplicationModels.GetListApplications();
return View(listeApplis);
}
In my ApplicationController :
public ActionResult Edit(ListBoxApplication listAppId)
{
// I WANT TO RETRIEVE MY listAppId HERE, but it is always 'null'
return View();
}
So I think my problem is in the actionLink :
#Html.ActionLink("Edit","Edit","Application", null, new { listAppId = Model.SelectedApplis})
Me Edit Method is not is the actual controller (Home/Index). I need to send the selectedValue of my ListBox in my actionLink to (Application/Edit).
The listAppId is always 'null'. It doesn't retrieve the value... Is there a mistake in my actionLink ?
Thanks for advance

Answer 1

I don't believe that action links will trigger a postback to the server. Try this instead:
#Html.ActionLink("Delete","Delete","Application")<br/>
#Html.ActionLink("Add","Create","Application")<br/>
#using (Html.BeginForm("Detail","Application"))
{
#Html.ListBoxFor(a => a.SelectedApplis, new SelectList(ViewBag.Applis)) //not sure what the other params you had here were for, but it should work like this
<br/>
<input type="submit" name="Edit" value = "Edit"/>
#*added in response to comment*#
<input type="submit" name="Delete" value = "Delete"/>
<input type="submit" name="Add" value = "Add"/>
}
If you plan on having all of those buttons post back to the server, you could also use ajax (and javascript) to accomplish this same goal, without needing to write out a form for each individual button. Both ways would work just fine, multiple forms is technically easier though.
public ActionResult Detail(ListBoxApplication listAppId, bool Edit, bool Add, bool Delete)
{
if(//check your bools here){
}
return View();
}