从模型错误中获取数据

Question

我是MVC的新手，我想从模型中获取数据，下面给出了我的代码以及相应的类。当我尝试使用现有代码进行操作时，它给了我错误，传递到字典中的模型项的类型为..，但此字典需要模型项的类型

        public ActionResult Index(string userid)
    {

        var model = new AssociationsViewModel()
        { 
            userid = userid,
            str = getAssociations(userid)
        };


        //AssociationsViewModel.RootObject obj = new AssociationsViewModel.RootObject();
        //  List< AssociationsViewModel.RootObject>   obj2 = model.userlist;

        //AssociationsViewModel flight = Newtonsoft.Json.JsonConvert.DeserializeObject<AssociationsViewModel>(model);

        return View(model);
    }

    public JsonResult getAssociations(string id)
    {

     var inputData = new Dictionary<string, string>()
      {
        { "databaseName", string.IsNullOrEmpty( Helper.databasename)? "" :  Helper.databasename},
        { "sourceUrl", Helper.sourceurl},
        { "physicianId", id },

      };

        var str = _client.FetchData
          (
            "associations/getAssociations",
            inputData
          );

        return Json( str.Content.ToString());
    }


public class AssociationsViewModel
{
    public string userid { get; set; }
    public System.Web.Mvc.JsonResult str { get; set; }

    public class RootObject
    {
        public string firstname { get; set; }
        public string lastname { get; set; }
        public string email { get; set; }
    }

    public List<RootObject> userlist { get; set; }
    public AssociationsViewModel()
    {

    }
}