ASP.NET MVC: ModelState vs. ModelStateDictionary

Question

I have a service which has a method that\'s called when a certain controller method is triggered.

My service returns a custom result object PlacementResult in w

Answer 1

You can pass the Controller to your method, since the Controller class contains the ModelState property. Once in your method you can do the following:

private PlacementResult BuildResult(Controller controller)
{
   controller.ModelState.AddModelError(propertyName, errorMessage);
}

In your action...

BuildResult(this);
if(ModelState.IsValid) {...