在控制器内切换视图模型

Switching viewmodel inside controller

告诉我,我有多个类别,例如主板、机箱和驱动器。他们每个人都有自己的视图模型,比如 MotherboardsView、CasesView 和 DrivesView。和视图模型 - MotherboardsViewModel、CasesViewModel 和 DrivesModel。 我有控制器,我想根据类别切换视图模型。 抽象代码看起来像这样:

//GET Action
public ActionResult Create(string Category)
{
    switch (Category)
    {
        case "Motherboards":
            var viewModel = new MotherboardsViewModel { };
            break;
        case "Cases":
            var viewModel = new CasesViewModel { };
            break;
        default:
            var viewModel = new DrivesViewModel { };
            break;
    }

    //Here i use switched viewmodel to change some values, like:
    viewModel.Name = GetRandomName();
    ...

    //And i return view and viewmodel
    return View(Category + "View", viewmodel)
}

有可能吗,我该如何解决这个问题?

这是一个基本的编程概念,与 MVC 无关。变量必须在使用它的代码 "scope" 内声明。您的 viewmodel 是在 switch 语句中声明的,在该代码块之外是看不到的。试试这个声明 viewmodel 这样它就可以被方法中的任何代码访问。注意 var 已被删除。

//GET Action
public ActionResult Create(string Category)
{
    object viewmodel = null;

    switch (Category)
    {
        case "Motherboards":

            MotherboardviewModel = new MotherboardsViewModel { };
            //Here i use switched viewmodel to change some values, like:
            MotherboardviewModel.Name = GetRandomName();
            ...
            viewModel = MotherboardviewModel;

            break;
        case "Cases":

            CaseviewModel = new CasesViewModel { };
            //Here i use switched viewmodel to change some values, like:
            CaseviewModel.Name = GetRandomName();
            ...
            viewModel = CasesviewModel;

            break;
        default:

            DriveviewModel = new DrivesViewModel { };
            //Here i use switched viewmodel to change some values, like:
            DriveviewModel.Name = GetRandomName();
            ...
            viewModel = DriveviewModel;

            break;
    }

    //And i return view and viewmodel
    return View(Category + "View", viewmodel)
}