HTML.DropDownListFor not passing parameter to controller? - asp.net-core

Question

i am trying to filter my view for a couple of hours by now. This is what i have:
My View:
#using (Html.BeginForm("Index", "RH_CentroCusto", FormMethod.Get))
{
#Html.DropDownListFor(f => f.DepartmentoSelecionado , Model.Departamentos, "Select")
}
in my Model Class :
public IEnumerable<SelectListItem> Departamentos { get; set; }
public string DepartmentoSelecionado { get; set; }
My controller:
//i want to receive the value in departamentoSelecionado !!
public IActionResult Index( string searchString, string departamentoSelecionado = "", int page = 1)
List<SelectListItem> selectList = new List<SelectListItem>();
foreach (var x in _context.RH_Departamento.ToList())
{
selectList.Add(new SelectListItem() { Text = x.Departamento , Value = x.Departamento });
}
//and then i add to the viewModel that i create the list
ViewModelCentroCusto vmcc = new ViewModelCentroCusto()
{
Departamentos = selectList
}
When i try to select one and click enter, it is suposed to be passing because in my browser i inspected and it was passing query parameters:
But in my controller my departamentoSelecionado is null, also the dropdown list gets the "select" again instead of keeping what i choose before! Any help is appreciated!

Answer 1

Change departamentoSelecionado to departmentoSelecionado . You spelt an extra letter a in departmentoSelecionado .
//public IActionResult Index( string searchString, string departamentoSelecionado = "", int page = 1)
public IActionResult Index( string searchString, string departmentoSelecionado = "", int page = 1)
The parameter in action method should be same as f => f.DepartmentoSelecionado.
Update 16/09/2020
Codes of controller
public class RH_CentroCustoController : Controller
{
//i want to receive the value in departamentoSelecionado !!
public IActionResult Index(string searchString, string departmentoSelecionado ="", int page = 1)
{
List<SelectListItem> selectList = new List<SelectListItem>();
IList<RH_Departamento> RH_Departamento = new List<RH_Departamento>(){
new RH_Departamento(){ Departamento="dep1" },
new RH_Departamento(){ Departamento="dep2" },
new RH_Departamento(){ Departamento="dep3" },
};//just for test
//foreach (var x in _context.RH_Departamento.ToList())
foreach (var x in RH_Departamento.ToList())
{
selectList.Add(new SelectListItem() { Text = x.Departamento, Value = x.Departamento });
}
//and then i add to the viewModel that i create the list
ViewModelCentroCusto vmcc = new ViewModelCentroCusto()
{
Departamentos = selectList
};
return View(vmcc);
}
}
Codes of View
#model xxx.Models.ViewModelCentroCusto
#{
Layout = null;
}
#using (Html.BeginForm("Index", "RH_CentroCusto", FormMethod.Get))
{
#Html.DropDownListFor(f => f.DepartmentoSelecionado, new SelectList(Model.Departamentos, "Value", "Text"), "Select");
<input type="submit" value="Save" />
}
Codes of Model
public class ViewModelCentroCusto
{
public IEnumerable<SelectListItem> Departamentos { get; set; }
public string DepartmentoSelecionado { get; set; }
}
public class RH_Departamento
{
public string Departamento { get; set; }
}
Test