Asp.NET MVC ModelBinder, getting Action Method

Question

I got a custom ModelBinder and i would like to get the action. Because i want to get the Attributes of the action using reflection, the action name is not enough.

my action method:

[MyAttribute]
public ActionResult Index([ModelBinder(typeof(MyModelBinder))] MyModel model)
{
}

and here a typically ModelBinder

public class MyModelBinder : IModelBinder
{
    public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) 
    {
        // here i would like to get the action method and his "MyAttribute"
    }
}

any suggestions, other solutions ?

many thanks in advance

Answer 1

No, you cannot with 100% certainty get the current action from a model binder. The model binder is not coupled to the action, but to binding to a model. For example, you can call

TryUpdateMode(model)

In an filter before an action has been chosen. Also note that an action method might not even be a CLR method (see http://haacked.com/archive/2009/02/17/aspnetmvc-ironruby-with-filters.aspx) that can be reflected on.

I think the real question is, what exactly are you trying to accomplish and is this the right way? If you want information from the action to be passed to the model binder (heeding the advice that your model binder should degrade gracefully if the information isn't there), you should use an action filter to put the information in HttpContext.Items (or somewhere like that) and then have your binder retrieve it.

An action filter's OnActionExecuting method receives an ActionExecutingContext which has an ActionDescriptor. You can call GetCustomAttributes on that.