Question

我正在使用MS northwind数据库，并使用Entity Framework。我想创建新产品，并使用dropdownList从Category Table加载CategoryName。

 public ActionResult Create()
 {
        var categories = from c in _en.Categories select c;
        ViewData["CategoryID"] = new SelectList(categories, "CategoryID", "CategoryName");
       return View();
 }

 <p>
        <label for="ds">CategoryID:</label>
        <%=Html.DropDownList("CategoryID", (SelectList)ViewData["CategoryID"])%>
 </p>

问题：如何从dropdownList保存数据？

[AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Create([Bind(Exclude = "ProductID")] Products productToCreate)
    {
        if (!ModelState.IsValid)
            return View();

        var c = _en.Categories.FirstOrDefault(z => z.CategoryID == ??? XXXX ???);

        productToCreate.Categories = c;

        _en.AddToProducts(productToCreate);

        _en.SaveChanges();

        return RedirectToAction("Index");
    }

如何从dropdownList获取CategoryID？

Answer 1

只需将CategoryID添加到参数中即可。

public ActionResult Create([Bind(Exclude = "ProductID")] Products productToCreate, string CategoryID)

发布动作在asp.net MVC中创建

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