ASP.NET MVC ViewData.Model requires casting

Question

I'm working on my first ASP.NET MVC application and have a strange issue. All the tutorials in regards to using strongly typed ViewData don't require casting/eval of ViewData / Model object but I get compilation errors if I don't cast to the ViewData object

ViewData class:

public class CategoryEditViewData
{
    public Category category { get; set; }
}

Controller Action:

public ActionResult Edit(int id)
{   
    Category category = Category.findOneById(id);
    CategoryEditViewData ViewData = new CategoryEditViewData();
    ViewData.category = category;
    return View("Edit", ViewData); 
}

Works:

<%=Html.TextBox("name", 
               ((Project.Controllers.CategoryEditViewData)Model).category.Name)) %>

Doesn't Work:

<%=Html.TextBox("name", Model.category.Name)) %>

Is there something that I am doing incorrectly - or do I have to cast to the object in the view all the time?

No the above code should work. That's exactly how I do it and never had an issue. Is there any more code to be seen or is it really as simple as this? — griegs
– griegs, Commented Aug 25, 2009 at 4:44

Lance Fisher · Accepted Answer · 2009-08-25 05:32:41Z

4

First, you should move the CategoryEditViewData class out of your controllers namespace, and into your models namespace. Create a new class under the Models folder to see what it should look like. It is good practice to put your models under the models folder.

Then your Control directive should look like this:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Models.CategoryEditViewData >" %>

edited Aug 25, 2009 at 5:32

answered Aug 25, 2009 at 5:22

Lance Fisher

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Comments

griegs · Accepted Answer · 2009-08-25 04:45:42Z

0

Wait, just thought of something. In your view are you inheriting from you model????

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<namespace.Controllers.YourFormViewModel>" %>

answered Aug 25, 2009 at 4:45

griegs

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3 Comments

Rockett Over a year ago

I added Inherits="System.Web.Mvc.ViewUserControl<namespace.Controllers.CategoryEditViewData>" but now receive a e: CS0115: 'ASP.views_category_edit_aspx.GetTypeHashCode()': no suitable method found to override compile error do I have to provide a GetTypeHashCode() in my CategoryEditViewData class

griegs Over a year ago

I'm sorry, did you type in namespace or did you use the namespace of your controller? For example you should use Project.Controllers.CategoryEditViewData as in your code above. Sorry if that wasn't clear.

Rockett Over a year ago

No I did type in the correct namespace. strange that it still isn't working.

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