Question

I m new to MVC, so maybe this is a stupid question - I m trying to get my head around strongly typed views in asp.net mvc. I m working on version 3. If I have a project with 2 models - say Person and Department. A person must belong to a department. So I have my Department model (and I ve generated my controller and CRUD interface):

public class Department
{
    public int Id { get; set;}
    public string DeparmentName { get; set;}
}

Then I have a Person model which references Department:

public class Person
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public int Department_Id { get; set; }
    [ForeignKey("Department_Id")
    public virtual Department Department { get; set;}
}

我现在提出我的主计长和看法。现在,当我看一下个人主计长时,我有以下工作:

public ActionResult Create()
{
    ViewBag.Department_Id = new SelectList(db.Deparments, "Id", "DepartmentName");
    return View();
}

而在《个人法典》中,《创建部门法》下降。

@Html.DropDownList("Department_Id", String.Empty)

根据我的理解,DroopDownList Html的助手正在利用GisBag制作我的下级名单。然而,第一民族和最后一个民族似乎在不依赖“观点”的情况下建立了自己的投入领域,因此,我认为,我本可以汇编时间,检查我的第一民族和最后一个民族领域,因为我的观点是严格分类的,而不是由我的德洛普·德南德斯。

是否有理由说明为什么对各省的DroopDownList没有大打字,或者我是否做过错,并且有办法使它严格分类?

Thanks :)

Answer 1

你们之所以需要一种观点,是因为你的看法约束的你的个人情况,没有所有可能的部门的数据,而只有属于哪个部门。这行的情况:

ViewBag.Department_Id = new SelectList(db.Deparments, "Id", "DepartmentName");

Is that all Departments from the DB are added to the Select List (for your DropDown to bind to) with Id as key asn DepartmentName as value. After your view is bound to the Person, the dropdown will show the appropriate Department.

Answer 2

如果你使用强烈的分类观点,那么你就应当有一种强烈的分类模式。

public class ViewData {
   public IList<Departments> Departments {get; set;}
}

然后,在你控制下,你:

public ActionResult Create()
{
    ViewData model = new ViewData();
    model.Departments = db.Deparments;
    return View(model);
 }

最后一个步骤是制定选择清单,并降低以下观点:

@model ViewData
@SelectList list = new SelectList(Model.Deparments, "Id", "DepartmentName");
@Html.DropDownList("Department_Id", list);

Hope this makes sense.

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