Automatic C# MVC Error Handling

Question

I've got this code.

 public ActionResult Index()
 {
        ReceiptModel model = new ReceiptModel();

        try
        {
            model = new ReceiptModel(context);
        }
        catch (BussinessException bex)
        {
            ModelState.AddModelError("Index", bex.MessageToDisplay);
            return View("Index");
        }
        return View(model);
 }

BussinesException ir returned from database and then displayed for user. I have to put on every controller method try-catch statement, which is a bit tedious. Is there any easier way how to handle these exceptions?

P.S. All other exceptions are handled with HandleExceptionAttribute

UPDATE:

I used Floradu88 approach. So Now i have something like this.

public sealed class HandleBussinessExceptionAttribute : HandleErrorAttribute, IExceptionFilter
    {

        public override void OnException(ExceptionContext filterContext)
        {
            filterContext.Controller.TempData["UnhandledException"] = filterContext.Exception;
            filterContext.ExceptionHandled = true;

            ((Controller)filterContext.Controller).ModelState.AddModelError(
                 ((BussinessException)filterContext.Exception).Code.ToString(),
                 ((BussinessException)filterContext.Exception).MessageToDisplay
             );

            filterContext.Result = new ViewResult
            {
                ViewName = this.View,
                TempData = filterContext.Controller.TempData,
                ViewData = filterContext.Controller.ViewData,
            };


        }
    }

and on Controller action i put

[HandleBussinessExceptionAttribute(Order = 2, ExceptionType = typeof(BussinessException), View = "Login")]

i also tried in exception handler:

 filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary(filterContext.RouteData));

and then handle error in action with ModelState.IsValid but values to action comes null. So for now i use first approach. When i have a bit more time i'll try to fix second approach.

Answer 1

1. According to this post, Create a custom binder and put the model in TempData:

   public class AppBinder : DefaultModelBinder
   {
       protected override void OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext)
       {
           base.OnModelUpdated(controllerContext, bindingContext);
           controllerContext.Controller.TempData["model"] =    bindingContext.Model;
       }
   }
   

2. Register it in global.asax:

   ModelBinders.Binders.DefaultBinder = new AppBinder();
   

3. Create a BaseController and override the OnException:

   protected override void OnException(ExceptionContext filterContext)
   {
       filterContext.ExceptionHandled = true;
   
       this.ModelState.AddModelError(string.Empty, filterContext.Exception.Message);
   
       filterContext.Result = new ViewResult
       {
           ViewName = filterContext.RouteData.Values["action"].ToString(),
           TempData = filterContext.Controller.TempData,
           ViewData = filterContext.Controller.ViewData
       };
   
       base.OnException(filterContext);
   }
   

All Actions int The Controllers which inherited from this base controller will show their unhandled exceptions their own view in validation summery (remember to have

@Html.ValidationSummary(true) 

in page). it works for me, hope works for you too!

Answer 2

Please read the documentation on this part: http://msdn.microsoft.com/en-us/library/gg416513%28v=vs.98%29.aspx
http://www.asp.net/web-api/overview/web-api-routing-and-actions/exception-handling
http://www.asp.net/mvc/tutorials/older-versions/controllers-and-routing/understanding-action-filters-cs

Too much content to be posted here:

 public class NotImplExceptionFilterAttribute : ExceptionFilterAttribute 
    {
        public override void OnException(HttpActionExecutedContext context)
        {
            if (context.Exception is NotImplementedException)
            {
                context.Response = new HttpResponseMessage(HttpStatusCode.NotImplemented);
            }
        }
    }

And your controller:

public class ProductsController : ApiController
{
    [NotImplExceptionFilter]
    public Contact GetContact(int id)
    {
        throw new NotImplementedException("This method is not implemented");
    }
}