Multiple Checkbox with Model returns null - asp.net-mvc

Question

after I read data from my database, I try to show those datas in Html.Helper checkbox and I do that. But later when I try to get checked values back to the controller, model always returns null. Here's my controller part:
[HttpGet]
public ActionResult NewClient()
{
HizmetModel hizmetModel = new HizmetModel();
hizmetModel.hizmet = db.Hizmet.ToList<Hizmet>();
return View(hizmetModel);
}
[HttpPost]
public ActionResult NewClientPost(string name, string lastname, string telephone, string plate, HizmetModel hizmet)
{
Musteri musteri = new Musteri();
if (!db.Musteri.Where(x => x.plaka == plate).Any())
{
musteri.isim = name;
musteri.soyisim = lastname;
musteri.telefon = telephone;
musteri.plaka = plate;
db.Musteri.Add(musteri);
db.SaveChanges();
}
Islem islem = new Islem();
IslemHizmet islemhizmet = new IslemHizmet();
islem.giristarihi = DateTime.Now;
islem.plaka = plate;
var selectedHizmet = hizmet.hizmet.Where(x => x.isChecked == true).ToList<Hizmet>();
db.Islem.Add(islem);
db.SaveChanges();
var onprocessplate = db.Islem.Where(x => x.plaka == plate).FirstOrDefault();
foreach (var item in selectedHizmet)
{
islemhizmet.islem_id = onprocessplate.islem_id;
islemhizmet.hizmet_id = item.hizmet_id;
db.IslemHizmet.Add(islemhizmet);
db.SaveChanges();
islemhizmet = new IslemHizmet();
}
TempData["Success"] = "Müşteri başarıyla eklendi...";
return RedirectToAction("CurrentClients", "Admin");
}
This is my model for the list:
public class HizmetModel
{
public List<Hizmet> hizmet { get; set; }
}
I use this model in the cshtml file:
#model otoyikama.Models.Model.HizmetModel
And this is the loop for displaying checkboxes
#for (int i = 0; i < Model.hizmet.Count; i++)
{
<li>
<label>#Model.hizmet[i].hizmetisim</label>
#Html.CheckBoxFor(m => m.hizmet[i].isChecked)
#Html.HiddenFor(m => m.hizmet[i].hizmet_id)
#Html.HiddenFor(m => m.hizmet[i].hizmetisim)
</li>
}
I couldn't figure what's the problem here, my get action works fine, I can see all the data from database but I can't pass them back to controller.

Answer 1

As a first think , u need to create a object in your controller parameters such as like List<int> serviceIDs or List<Service> services so you can keep more data than one.
The html part:
#foreach(item in Model.Service)
{
<label>#item.ServiceName</label><br>
<input type="checkbox" name="services" value="#item.ServiceID">
<input type="hidden" name="services" value="#item.ServiceName">
}
The backend part:
[HttpPost]
public ActionResult NewClientPost(string name, string lastname, string telephone, string plate, List<Service> services)
{
}
when u do in that way, u will able to hold more services than to one and i think u can pass them the controller more easly.
when i face with that stuation, im taking those services ID's and calling them on the controller side like bellow;
The html part:
#foreach(item in Model.Service)
{
<label>#item.ServiceName</label><br>
<input type="checkbox" name="serviceIDs" value="#item.ServiceID">
}
The backend part:
[HttpPost]
public ActionResult NewClientPost(string name, string lastname, string telephone, string plate, List<int> serviceIDs)
{
List<Service> services= new List<Service>();
foreach(var item in serviceIDs)
{
var service=db.Service.Where(x => x.ServiceID == item).Any()
if(service.Count!=0)
{
services.Add(service);
}
}
}