asp.net-mvc-3 - 发回 View 后值不会改变？

Question

编辑:我更改了我的问题和代码以更好地阐明我的问题

我有这个(强类型 View )确实使用 Controller 中为该特定模型提供的值

我想从另一个模型向模型添加一些东西，从我的 httpPost 操作回发后没有任何反应......

提前致谢!

------------------------------------其他代码来进一步澄清我的问题----

 public class Address
 {
public int Id { get; set;}
public String Name { get; set;}
 }

 public class OtherAddress
 {
public int Id { get; set;}
public String Name { get; set;}
public String City { get; set;}
 }

 public class MasterModel
{
 public Address Address { get; set;}
 public List<OtherAddress> OtherAddressess { get; set;}
 }



 public ActionResult Create()
 {
 MasterModel Model = new MasterModel();
 Model.Person = new Person();
 Model.Address = new Address();
 Model.OtherAdressess = new List<OtherAddress>();

 DBContext _db = new DBContext();
 Model.OtherAdressess = _db.OtherAddressess.Where(a=> a.City == "Amsterdam");
 return View(Model);
 }

在 View 中

    @model Project.Models.MasterModel

    List<SelectListItems> items = new List<SelectListItems>();

    foreach(var a in Model.OtherAddressess)
    {
        SelectListItem item = new SelectListItem();
        item.Value = a.Id.toString();
        item.Text = a.Street;
    }

    @using (@Html.BeginForm())
    {
    <div>
    <select name="otheraddress">
    foreach(var i in Items)
    {
        <option value=@i.Value>@i.Text</option>
    }
    </select>
    <input type="submit" name="select" value="Select Address"/>
    </div>
    <div>
    @Html.EditorFor(model => Model.Address.Name)
    <div>
    <p>
    <input type="submit" value="Submit"/>
    </p>
    }

在帖子中

    [HttpPost]
    public ActionResult Create(MasterModel Model)
    {
    String otherAddressSelected = Request.Params["select"];
    if(!String.IsNullOrEmpty(otherAddressSelected))
    {
        int id = int.Parse(Request.Params["otheraddress"]);
        DBContext _db = new DBContext();
        OtherAddress oa = _db.OtherAddress.Single(oa=> oa.Id == id);
        Model.Address.Name = oa.Name;
        return View(Model);
    }
    //other stuff here
    }

Answer 1

如果您想在 [HttpPost] Controller 中更改模型的值，您必须删除要更改的实例/属性的模型状态。例如:

  [HttpPost]
  public ActionResult Index(SomeModel model)
  {
     ModelState.Remove("Name");
     model.Name = "some new name";
      return View(model);
  }

从this得到答案例子