Question

I’m developing an ASP.NET MVC 3 project and I want to implement my custom error handling logic. I’m trying to this by extending HandleErrorAttribute like this :

public class ErrorHandlingAttribute : HandleErrorAttribute
{
    public override void OnException(ExceptionContext filterContext)
    {
        if (!filterContext.ExceptionHandled)
        {
            filterContext.Result = new JsonResult { 
                                                    Data = new { success = false, error = filterContext.Exception.ToString() }, 
                                                    JsonRequestBehavior = JsonRequestBehavior.AllowGet 
                                                  };
            filterContext.ExceptionHandled = true;
        }
    }
}

What I need is, after some AJAX calls, to show some error message (by rendering a partial view) on a modal popup dialog. So, in the OnException method, I set the ExceptionContext’s result as a JsonResult (I’m not rendering the partialview to string right now, I’ll do that later)

My controller action is like below (I have decorated it with my custom filter):

 [HttpPost]
 [ErrorHandling]
 public JsonResult Create(StopEditViewModel viewModel)
 {
        Stop stop = Mapper.Map<StopViewModel, Stop>(viewModel.Stop);

        if (ModelState.IsValid)
        {
            Stop addedStop = _testFacade.AddStop(stop);

            return Json(new { success = true, tableContainer = _tableName }, JsonRequestBehavior.DenyGet);
        }

        return Json(new { success = false }, JsonRequestBehavior.DenyGet);
 }

After doing some research, I found that I need to remove filters.Add(new HandleErrorAttribute()); line from the RegisterGlobalFilters method in Global.asax. I did that too.

My web.config file has <customErrors mode="On" /> tag.

But when I call the Create POST action, if an exception occurs, the custom filter method is not invoked. The application crashes. Am I missing something?

Thanks.

Answer 1

you can catch Exception OnFailure method in ajax option

In View
@using (Ajax.BeginForm("SomeAction", new AjaxOptions { OnFailure = "handleAjaxError" }))
{

}

function handleAjaxError(ajaxContext) {
     alert("Request failed, status code ");
}

when you call action using Ajax it return within method.