Question

I was wondering what the best practice is when populating commonly used dropdownlists in ASP.NET MVC. For instance, I have a Country and State select which is used often in my application. It seems dirty to populate viewmodel and bind to that viewmodel from my controller for every single view I want to contain such a dropdownlist.

How do people populate their dropdownlists in such cases? – custom baseclass with this baked in? Helper classes, etc?

Thanks in advance,

JP

Answer 1

You can have a RequiresStateList attribute to inject that common functionality to the actions that need it.

public class RequiresStateList : ActionFilterAttribute {
    public override void OnResultExecuting(ResultExecutingContext filterContext) 
    {
        filterContext.Controller.ViewData["StateList"] = GetStates();
    }
}

And your action

[RequiresStateList]
public ActionResult Index() {
    return View();
}

Now you can get that list from the ViewData in your view.