MVC: Can I use ModelState inside class out of controller?

Question

Can I do this inside one class?

    ...
    using System.Web.Mvc;
    ...

    public static class aaa 
    {

      public static test() {

         if (something) ModelState.AddModelError("", "test");
      }

    }

inside controller call:

...

public class MyControler {

     public void Index() {
          ....
          aaa.test();
          ....
     }

}

Is it possible? I want to control the code inside a classes in another part of the controller.

Answer 1

You can pass your model state around like this:

public static void test(ModelStateDictionary ModelState)
{
    if (something) ModelState.AddModelError("", "test");
}

And call from inside your controller:

aaa.test(ModelState);

Answer 2

No, you can't. What you're referencing inside Controller is its property, not a class. You can still pass it to the method being called as an argument.