LayoutPage上的MVC DropDown会影响所有页面

Question

我希望在布局共享视图上有3个下拉列表（使用我将要创建的模型中的视图包），这将影响所有其他视图上显示的数据。

最好的方法是什么？ 过滤下拉列表只需要下拉列表2.下拉列表2将影响所有页面。 DropDown 3只会影响＆＃34; ScoreCard＆＃34;之一。

编辑1

我现在有了basemodel模型和控制器，如下所示。

namespace RapidScan_v2.Models
{
    public class LayoutBaseModel
  {
    [Key]
    public string ContractID { get; set; }
    public string ContractName { get; set; }
    public string CountryCode { get; set; }
    public string CountryName { get; set; }
    public Nullable<System.DateTime> SnapshotMonth { get; set; }  
  }
}

的Controler：

namespace RapidScan_v2.Controllers
{
public class LayoutBaseModelController : Controller
{
    private RapidScanEntities2 db = new RapidScanEntities2();

    // GET: LayoutBaseModel
    public ActionResult Index()
    {
        List<LayoutBaseModel> model = new List<LayoutBaseModel>();

        var fact_contract_actions_mn = (from a in db.v_contract_detail
                                        join b in db.fact_contract_actions_mn
                                             on a.ContractID equals b.ContractID
                                        select new  
                                        {
                                            ContractID = b.ContractID,
                                            ContractName = a.ContractName,
                                            CountryCode = a.CountryCode,
                                            CountryName = a.CountryName,
                                            SnapshotMonth = a.SnapshotMonth
                                        }).ToList();

        foreach (var item in fact_contract_actions_mn)
        {
            model.Add(new LayoutBaseModel()
            {
                ContractID = item.ContractID,
                ContractName = item.ContractName,
                CountryCode = item.CountryCode,
                CountryName = item.CountryName,
                SnapshotMonth = item.SnapshotMonth
            });
        }

        ViewBag.CountryName = new SelectList(db.v_contract_detail, "CountryCode", "CountryName");
        ViewBag.ContractID = new SelectList(db.v_contract_detail, "ContractID","ContractName");
        ViewBag.SNapshotMonth = new SelectList(db.v_contract_detail, "SnapshotMonth");


        return View(model);
      }
  }
}

添加到＆＃34; _Layout＆＃34;视图。     {@model IEnumerable＆lt; RapidScan_v2.Models.LayoutBaseModel＆GT; }

但是现在出现错误： ＆＃34;传递到字典中的模型项的类型是＆＃39; System.Collections.Generic.List 1[RapidScan_v2.Models.ActionsBenefitViews]', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable 1 [RapidScan_v2.Models.LayoutBaseModel]＆＃39;。＆＃34;