Что-то вроде этого?:
public class ValidateActionFilterAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
var yourController = filterContext.Controller as YourController;
if (yourController == null)
{
throw new InvalidOperationException("It is not YourController !!!");
}
// It is YourController - validate here
var yourProperty = yourController.YourProperty;
// UPDATED ***************************
// or test whether controller has property
var property = filterContext.Controller.GetType().GetProperty("YourProperty");
if(property == null)
{
throw new InvalidOperationException("There is no YourProperty !!!");
}
}
}