Proplem view category in mvc 3 - asp.net-mvc-3

Question

I have 1 project name MVC1
I have 2 classes below:
public class category
{
public int ID {get;set;}
public string Name {get;set;}
}
public class detail
{
public int Id {get;set;}
public string Name {get;set;}
public int CategoryID{get;set;}
}
and 2 Intefaces
public inteface ICategory
{
IList<category> ListCategory();
}
public interface IDetail
{
IList<Detail> ListDetail();
}
and 1 Model RCateory inheritance from inteface ICategory
public IList<Category> FindAllCategory()
{
List<Category> Listcategory_ = new List<Category>();
foreach (var category in Listcategory)
{
Listcategory_.Add(category);
}
return Listcategory_;
}
and 1 Model name RDetail inheritance from inteface IDetail
public IList<Detail> FindAllDetail()
{
List<Detail> Listdetail_ = new List<Detail>();
foreach (var detail in Listdetail_)
{
Listdetail_.Add(detail);
}
return Listdetail_;
}
and 1 Controller
DetailController
private RDetail rDetail = new RDetail();
private RCategory rCategory = new RCategory();
public ActionResult ListDetail()
{
var detail = rdDetail;
return View("CreateDetail");
}
and 1 View type (cshtml) CreateDetail container
#model MVC1.Detail
How do I put into the category to #Html.DropDownListFor

Answer 1

As always in an ASP.NET MVC application you start by creating a view model class that will contain everything that your view needs:
public class MyViewModel
{
public Detail Detail { get; set; }
public IEnumerable<SelectListItem> Categories { get; set; }
}
and then have your controller action populate and pass this view model to the view:
public ActionResult ListDetail()
{
var model = new MyViewModel();
model.Detail = rDetail;
model.Categories = FindAllCategory().Select(x =>
Value = x.ID.ToString(),
Text = x.Name
);
return View("CreateDetail", model);
}
and finally your view will become strongly typed to the view model and you will be able to display the dropdown:
#model MyViewModel
...
#Html.DropDownListFor(x => x.Detail.CategoryID, Model.Categories)