环境ASP.net MVC5 +实体框架代码优先ASP.NET MVC DROPDOWNLIST不选择值
public class Vender
{
public int VenderID { get; set; }
public string VenderCode { get; set; }
public string CompanyCode { get; set; }
public string CompanyFullName { get; set; }
public string CreateUser { get; set; }
public int VenderCityId { get; set; }
}
对于VenderCityId喜欢另一类 “城市”,它具有ID和名称
我有一个VenderViewModel
public class VenderViewModel
{
public Vender Vender;
public VenderViewModel(IVenderRepository _venderRepository,int? Id)
{
if (Id==null)
{
Vender = new Vender();
}
else
{
Init(_venderRepository, Id);
}
}
private void Init(IVenderRepository _venderRepository, int? Id)
{
Vender = _venderRepository.GetVenderById(Id);
}
public IEnumerable<SelectListItem> CityItems
{
get
{
IEnumRepository cityEnumRepository=new EnumRepository(new MasterDataContext());
IEnumerable<City> _city = cityEnumRepository.GetAll<City>();
var allCitys = _city.Select(m => new SelectListItem
{
Value = m.Id.ToString(),
Text = m.Name
});
//return allCitys;
return DefaultCity.Concat(allCitys);
}
}
public IEnumerable<SelectListItem> DefaultCity
{
get
{
return Enumerable.Repeat(new SelectListItem
{
Value = "-1",
Text = "Select a City"
}, count: 1);
}
}
这里是关于控制器,只是简单的
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
//Vender vender = _venderRepository.GetVenderById(id);
VenderViewModel vm = new VenderViewModel(_venderRepository, id);
if (vm.Vender == null)
{
return HttpNotFound();
}
return View(vm);
}
从调试中,我可以确认此视图模型具有VenderCityId的值。
最后认为:
@Html.DropDownListFor(model => model.Vender.VenderCityId, Model.CityItems)
的问题是下拉列表无法显示正确的项目。加载后没有选择项目。
我只是注入存储库。它不能解决这个 – Ling