c# – 为ASP.NET MVC5关系创建DropDownList

这个问题在这里已经有一个答案：> Populating a razor dropdownlist from a List<object> in MVC7个
我被困在ASP.NET MVC5中创建一个正确的创建/编辑视图.我有两个模型狗和人.一只狗属于一个人.我正在尝试在Dog的创建和编辑视图中创建一个下拉列表,这将允许我为该特定的狗选择一个Human的名字.这是我的型号：

人类：

public class Human
{
    public int ID { get; set; }
    public string Name { get; set; }
}

狗：

public class Dog
{
    public int ID { get; set; }
    public string Name { get; set; }
    public Human Human { get; set; }
}

我的创建动作：

// GET: /Dog/Create
public ActionResult Create()
{
    ViewBag.HumanSelection = db.Humen.Select(h => new SelectListItem
    {
        Value = h.ID.ToString(),Text = h.Name
    });
    return View();
}

这是我看法的相关部分：

<div class="form-group">
    @Html.LabelFor(model => model.Human.Name,new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @Html.DropDownListFor(model => model.Human,ViewBag.HumanSelection);
    </div>
</div>

运行这个时我收到以下错误：

Compiler Error Message: CS1973: 'System.Web.Mvc.HtmlHelper<Test.Models.Dog>' has no applicable method named 'DropDownListFor' but appears to have an extension method by that name. Extension methods cannot be dynamically dispatched. Consider casting the dynamic arguments or calling the extension method without the extension method syntax.

我是C#&实体框架.我究竟做错了什么？有没有手动查询数据库的方法？像Rails中的收集表单助手一样吗？
我遵循了一堆老式或太复杂的教程,让我无法遵循.

public int HumanId { get; set; }

@Html.DropDownListFor(model => model.HumanId,(SelectList)ViewBag.HumanSelection);

[HttpPost]
public ActionResult Create (CreateModel model)
{
    if(model.HumanId > 0)
    {
        model.Human = GetHumanByID(model.HumanId);
        //or however you want to get the Human entoty from your database
    }
}

db.Humen