asp.net-mvc – asp.net mvc viewmodels.它们应包含多少逻辑(如

我一直在研究mvc的视图模型,我正在寻找最好的方法来实现它们.我读过很多不同的文章,但似乎没有一个明确的“最佳方式”.到目前为止,我可能有一个具有以下属性的Customer模型：

>名字
>姓氏
>标题
>位置

其中location是数据库中位置表的外键.

我希望能够编辑此客户,但只能编辑名字,姓氏和位置.我对编辑中的标题并不感到烦恼.因此,在我看来,我需要传递一个客户和一个选定的列表.

从我读过的内容来看,我有以下几种选择(可能还有更多).

所以我的问题基本上哪个是最好的？

1)

将选择列表添加到ViewData [“Location”]并只创建一个强类型的客户视图？

2)

创建一个视图模型,我传递客户并选择列表(数据访问在控制器中完成)：

public class ViewModelTest
{
    public Customer Customer { get; set; }
    public SelectList Locations { get; set; }

    public ViewModelTest(Customer customer,SelectList locations)
    {
        Customer = customer;
        Locations = locations;
    }
}

3)

创建一个视图模型,我在其中传递客户和位置列表,并在视图模型中创建选择列表.

public class ViewModelTest
{
    public Customer Customer { get; set; }
    public SelectList Locations { get; set; }

    public ViewModelTest(Customer customer,List<Location> locations,string selectedLocation)
    {
        Customer = customer;
        Locations = new SelectList(locations,"LocationID","LocationName",selectedLocation);
    }
}

4)

传递客户和存储库,并在视图模型中执行数据访问.

public class ViewModelTest
{
    public Customer Customer { get; set; }
    public SelectList Locations { get; set; }

    public ViewModelTest(Customer customer,IRepository repository,string selectedLocation)
    {
        Customer = customer;
        Locations = new SelectList(repository.GetLocations(),selectedLocation);
    }
}

5)

使用我需要的属性创建视图模型：

public class ViewModelTest
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public SelectList Locations { get; set; }

    public ViewModelTest(Customer customer,SelectList locations)
    {
        FirstName = customer.FirstName;
        LastName = customer.LastName ;
        Locations = locations;
    }
}

6)

或者上述或其他方式的其他组合.

欢迎所有意见.

public class SomeViewModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Location { get; set; }
    public IEnumerable<SelectListItem> PossibleLocations { get; set; }
}

public ActionResult Index()
{
    var customer = Repository.GetCustomer();
    var locations = Repository.GetLocations();
    var viewModel = new SomeViewModel
    {
        FirstName = customer.FirstName,LastName = customer.LastName,Location = customer.Location,PossibleLocations = new SelectList(locations,customer.Location);
    };
    return View(viewModel);
}

[HttpPost]
public ActionResult Index(SomeViewModel viewModel)
{
    // TODO: Handle the form submission
    return View(viewModel);
}