尝试实现ListBoxFor时出现CS1973错误

Question

I'm trying to implement a very simple multiple select in .NET where the drop-down values are dynamically created.

The Code:

I created a View Model:

public class FiltersViewModel
{
    public int[] SelectedNatures { get; set; }
    public IEnumerable<SelectListItem> Natures { get; set; }

    public void FillNatures()
    {
        var repository = new LeadRepository();
        IEnumerable<string> natures = repository.GetNatures();

        var items = new List<SelectListItem> {};
        foreach (var nature in natures)
        {

            items.Add(new SelectListItem {Value = (string) nature, Text = (string) nature});
            Natures = items.ToArray();

        }
    }
}

I created an instance of the model in the controller:

public ActionResult Map()
    {
        var model = new FiltersViewModel {SelectedNatures = new int[] {}};

        model.FillNatures();

        ViewData.Model = model; 

        return View();

    }

Then I added in the View:

 <%: Html.ListBoxFor(x => x.SelectedValues, Model.Values) %>

Error:

Compiler Error Message: CS1973: 'System.Web.Mvc.HtmlHelper' has no applicable method named "ListBoxFor"

Question:

• Is there a simpler way to implement a multiselect? (I just want to create it, then I use ajax to take the input)
• What is the problem in my current code?
• How can I choose a class and id for my select?

Answer 1

It seems this question deals with the same error. I'll try to see if the answer works.