MVC3的DropDownList + ViewBag问题 [英] MVC3 DropDownList + ViewBag issue

问题描述

这code正常工作

List<StateModelView> stateList = (from x in db.States
                                select new StateModelView {
                                    ID = x.ID,
                                    StateName = x.StateName
                                }).OrderBy(w => w.StateName).ToList();

ViewBag.StateList = new SelectList(stateList, "ID", "StateName");

在HTML我有

 @Html.DropDownList("StateList", ViewBag.StateList)

无论如何，我得到了错误

Anyway I got the error

CS1973：'System.Web.Mvc.HtmlHelper'有一个名为DropDownList的没有适用的方法，但似乎有这个名字的扩展方法。扩展方法不能进行动态调度。考虑强制转换动态参数或调用没有扩展方法的语法扩展方法。

我怎样才能解决这个问题？

How I can resolve it?

推荐答案

的 ViewBag 是的 动态 对象，它不能从您的视图直接使用（这基本上是错误的说法） 。你需要转换它：

The ViewBag is a dynamic object, which cannot be used directly from your View (that is basically what the error is saying). You'll need to cast it:

@Html.DropDownList("StateList", (SelectList) ViewBag.StateList)

另一种选择是使用的ViewData 尽管它可能还需要铸造。

Another option would be to use ViewData though it may also require casting.

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