ASP.NET - MVC 4使用从控制器到视图的变量

Question

I have this controller like so:

public class PreviewController : Controller
{
    // GET: Preview
    public ActionResult Index()
    {
        string name = Request.Form["name"];
        string rendering = Request.Form["rendering"];

        var information = new InformationClass();
        information.name = name;
        information.rendering = rendering;

        return View(information);
    }
}

and in the view, I am trying to the information.name like so:

@ViewBag.information.name

I also tried just:

@information.name

but got the same error for both:

Cannot perform runtime binding on a null reference

What am I doing wrong?

Answer 1

You must use @Model.name in view. Not @ViewBag.information.name . Also in top of your view you must define something like this:

@model Mynamespace.InformationClass

And it would be better to use MVC's model binding feature. Therefore change your action method like this:

public class PreviewController : Controller
{
    [HttpPost] // it seems you are using post method
    public ActionResult Index(string name, string rendering)
    {
        var information = new InformationClass();
        information.name = name;
        information.rendering = rendering;

        return View(information);
    }
}

Answer 2

In the view just type

@Model.name

Since InformationClass is your model you just call its properties from the view using @Model

Answer 3

You need to set ViewBag.InformationName in your action:

ViewBag.InformationName = name;

And then in your view you could reference it:

@ViewBag.InformationName

Or if you're trying to work with the model data in the view, you'd reference it through this:

@Model.name

Answer 4

Please add that sample to your view file

   @model Your.Namespace.InformationClass

That line is responsible for defining your model type. And after that you can just use:

   @Model.name;