I am implementing a custom credit check filter for a controller action. I use Ninject as my Ioc container. First, create a action filter and implement IActionFilter interface, implement the OnActionExecuted() and OnActionExecuting() methods. Within the credit checking functions, it needs a CreditService to check against the repository and database. So I have created the parameterized constructor using Ninject to inject the CreditService object.
public class CreditCheckFilter : IActionFilter
{
private ICreditService _creditService { get; set; }
public CreditCheckFilter(ICreditService myService)
{
_creditService = myService;
}
public void OnActionExecuted(ActionExecutedContext filterContext)
{
}
public void OnActionExecuting(ActionExecutingContext filterContext)
{
var userName = filterContext.HttpContext.User.Identity.Name;
var bal = _creditService.GetTokenBalance(WebSecurity.GetUserId(userName));
if (bal <= 0)
{
RouteValueDictionary redirectTargetDictionary = new RouteValueDictionary();
redirectTargetDictionary.Add("action", "GetTokens");
redirectTargetDictionary.Add("controller", "Account");
filterContext.Result = new RedirectToRouteResult(redirectTargetDictionary);
}
}
}
Now Let’s create a CreditCheckAttribute that implements FilterAttribute, this is the attribute we put against the controller action,
public class CreditCheckAttribute : FilterAttribute { }
Now, we need to use Ninject BindFilter() method to bind our CreditCheckFilter, when a controller action has the attribute CreditCheckAttribute. In the ninject kernel, do this,
kernel.BindFilter(FilterScope.Action, 0).WhenActionMethodHas();
The last step is to put CreditCheckAttribute() against the controller action,
[CreditCheckAttribute]
public ActionResult Playlist(TestViewModel model)
{
return View(model);
}
