ASP.Net MVC - 为关联对象下拉列表 [英] ASP.Net MVC - dropdown list for associated objects

问题描述

我在我的应用程序两种型号：产品和 ProductType 。 产品有一个参考 ProductType （以它命名为DB ProductTypeId ），而 ProductType 有两列（编号和名称）。

I have two models in my application: Product and ProductType. Product has a reference to ProductType (in the DB it's named ProductTypeId), while ProductType has two columns (Id and Name).

我可以得到下拉菜单进行适当填充，然后使用以下code显示在论坛上：

I can get the dropdown to be properly populated and displayed on the forum using the following code:

var typeList = new SelectList(_entities.ProductType.ToList(), "Id", "Name");
ViewData["Types"] = typeList;

查看：

<%= Html.DropDownList("ProductType", (IEnumerable<SelectListItem>) ViewData["Types"]) %>

不过我的问题就它没有更新模型回到控制器。如果我离开了code原样，那么的ModelState是无效的，因为在视图中的 ProductType 字符串，但是，如果我将其更改为别的，似乎我不能再引用它的控制器中。

However my problem becomes that it's not updating the model back in the Controller. If I leave the code as is, then the ModelState is invalid because of the ProductType string in the view, However, if I change it to anything else, it seems I can no longer refer to it within the controller.

推荐答案

我只是想同样的事情，它为我工作就好了。

I just tried the very same thing and it worked for me just fine

控制器：

 public ActionResult Create()
    {
    configuratorDataContext dc = new configuratorDataContext();
    SelectList typelist = new SelectList(dc.Product_types.ToList(), "id", "Name");
    ViewData["Product_Types"] = typelist;
    ViewData.Model = new Product(); 
    return View();
    } 

    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Create(Product createProduct)
    {
    // createProduct here contains correct type_id wich 
    }

查看：

  <%= Html.DropDownList("type_id", (IEnumerable<SelectListItem>) ViewData["Product_Types"])%>

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