Question

让我们说，我有多种类别，如主板，机箱和驱动器。他们每个人都有自己的viewmodel视图，比如MotherboardsView，CasesView和DrivesView。和viewmodels - 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，我怎么能解决这个问题？

Answer 1

这是一个基本的编程概念，与MVC无关。必须在使用它的代码的“范围”内声明变量。您的viewmodel在switch语句中声明，并且在该代码块之外无法看到。试试这个声明viewmodel，以便方法中的任何代码都可以访问它。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)
}

切换控制器内的视图模型

1 个答案: