WebApi MVC 6 Model State Methods missing ex: ModelState.IsValid and AddModelError

[snapbatch]

I am converting a ASP 4 Web Api 2 to the new Asp.Net 5. After removing the old System.Web.Http and System.Web.Http.Description and replacing those NameSpaces with Microsoft.AspNet.Mvc. Now on a simple route in my controller. I am getting an error ModelState does not contain a definition for IsValid.

if (!ModelState.IsValid)
return new HttpStatusCodeResult(305);

This also happens in ModelState.AddModelError

[Eilon]

The methods are still there, and have pretty much always been there:

• IsValid: https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNet.Mvc.Abstractions/ModelBinding/ModelStateDictionary.cs#L145
• AddModelError: https://github.com/aspnet/Mvc/blob/dev/src/Microsoft.AspNet.Mvc.Abstractions/ModelBinding/ModelStateDictionary.cs#L203

[snapbatch]

@Eilon I should have mention that I do have the dependency Microsoft.AspNet.Mvc.ModelBinding; but its still giving me the error.

My class consist of and none of these are working.
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Mvc;
using Microsoft.AspNet.Mvc.Abstractions;
using Microsoft.AspNet.Mvc.ModelBinding;
using Microsoft.AspNet.Http;
using Microsoft.AspNet.Http.Internal;
using Microsoft.AspNet.Mvc.Filters;
using Microsoft.AspNet.Mvc.ModelBinding.Validation;
using Microsoft.AspNet.Mvc.ViewFeatures;
using Microsoft.AspNet.Routing;

[pranavkm]

Is your controller type deriving from Microsoft.Aspnet.Mvc.Controller?

[Eilon]

Hover over the ModelState property and press F12 to go to its definition. I'm guessing it's the wrong type to begin with.

[Eilon]

Also, you shouldn't have to import any namespaces to access that. If you're in a controller, you have access to it.

[snapbatch]

@pranavkm I thought that in MVC 6 there is no need for base controller classes. I received that information from a video here. https://channel9.msdn.com/Events/dotnetConf/2014/MVC-6

@Eilon I went into the definition. ModelState is using the Controller class in the namespace Microsoft.AspNet.Mvc

[snapbatch]

Ok Thanks @Eilon and @pranavkm I had to add Microsoft.AspNet.Mvc.Controller as a base controller. If I were you guys. I would really look at taking that video down because it clearly states that in MVC6 a base class is not required. If it is required and I just misheard it wrong. The video needs to be more clear at explaining the "why".

Thanks!

[Muchiachio]

It's not required, but if you want to use ModelState which is a property of Microsoft.AspNet.Mvc.Controller, you have to extend it.
You can't access ModelState from thin air right? 😃

[NeelBhatt]

@Muchiachio I guess ModelState is not a property but an instance of class ModelStateDictionary.cs which has IsValid propery.