发布操作在asp.net中创建MVC

Question

我使用MS Northwind数据库，并使用实体框架。 我想创建新产品，并使用dropdownList从类别表中加载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中获取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)