.NET MVC Form Radio 通过强类型向控制器传值

public class Fo
    {
        public string foName { get; set; }
        public List<Models.a> aList { get; set; }
    }

public class a
    {
        public string name { get; set; }
        public int age { get; set; }
        public int option { get; set; }
        public List<Option> optionList { get; set; }
    }

public class Option
    {
        public string option { get; set; }
        public int score { get; set; }

        public Option()
        {

        }
        public Option(string o, int s)
        {
            this.option = o;
            this.score = s;
        }
    }

public ActionResult Index()
        {
            Models.Fo fo = new Models.Fo();
            fo.foName = "xxx";
            fo.aList = new List<Models.a>();
            for (int i = 0; i < 3; i++)
            {
                Models.a model = new Models.a();
                model.name = "name" + i.ToString();
                model.age = 30 + i;
                model.optionList = new List<Models.Option>();
                model.optionList.Add(new Models.Option("是", 10));
                model.optionList.Add(new Models.Option("否", 20));
                fo.aList.Add(model);
            }

            return View(fo);
        }

        public string Regist(Models.Fo model)
        {

            return "ok";
        }

@model MvcApplication1.Models.Fo

@using (Html.BeginForm("Regist", "Home", FormMethod.Post))
{
    <p>@Html.TextBoxFor(m => m.foName)</p>
    for (int i = 0; i < Model.aList.Count; i++)
{
        <p>
            @Html.TextBoxFor(m => m.aList[i].name)
            @for (int l = 0; l < Model.aList[i].optionList.Count; l++ )
            {
                <span>
                    @Html.RadioButtonFor(m => Model.aList[i].option,Model.aList[i].optionList[l].score)
                    @Model.aList[i].optionList[l].option
                </span>
            }
        </p>
    }
    <input type="submit" id="btnsubmit" value="提交" class="submit" />
}