Automatic C# MVC Error Handling - asp.net-mvc

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

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");
}
}

Answer 2

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;
}
}
Register it in global.asax:
ModelBinders.Binders.DefaultBinder = new AppBinder();
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!