ASP.net MVC - Custom HandleError Filter - Specify View based on Exception Type

Question

I am inheriting the HandleErrorAttribute in my MVC application so I can log the error:

public class HandleAndLogErrorAttribute : HandleErrorAttribute {     public override void OnException(ExceptionContext filterContext)     {         base.OnException(filterContext);          if( filterContext.Exception != null )         {             // log here         }     } } 

I'm adding this as a global filter:

public static void RegisterGlobalFilters(GlobalFilterCollection filters) {     filters.Add(new HandleAndLogErrorAttribute()); } 

Is it possible to specify a custom view for specific exception types as well? For example:

if( filterContext.Exception is DivideByZeroException ) {     // how do i specify that the view should be DivideByZero? } 

Answer 1

1. Create a new filter which inherits HandleErrorAttribute (or implements IExceptionFilter directly)
2. Register it in global.asax (by replacing filters.Add(new HandleError());):

Here is a filter that I've created that tries to find a view per specific HTTP status code:

public class MyErrorHandler : FilterAttribute, IExceptionFilter {     public void OnException(ExceptionContext filterContext)     {         if (filterContext.ExceptionHandled || !filterContext.HttpContext.IsCustomErrorEnabled)             return;          var statusCode = (int) HttpStatusCode.InternalServerError;         if (filterContext.Exception is HttpException)         {             statusCode = filterContext.Exception.As<HttpException>().GetHttpCode();         }         else if (filterContext.Exception is UnauthorizedAccessException)         {             //to prevent login prompt in IIS             // which will appear when returning 401.             statusCode = (int)HttpStatusCode.Forbidden;          }         _logger.Error("Uncaught exception", filterContext.Exception);          var result = CreateActionResult(filterContext, statusCode);         filterContext.Result = result;          // Prepare the response code.         filterContext.ExceptionHandled = true;         filterContext.HttpContext.Response.Clear();         filterContext.HttpContext.Response.StatusCode = statusCode;         filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;     }      protected virtual ActionResult CreateActionResult(ExceptionContext filterContext, int statusCode)     {         var ctx = new ControllerContext(filterContext.RequestContext, filterContext.Controller);         var statusCodeName = ((HttpStatusCode) statusCode).ToString();          var viewName = SelectFirstView(ctx,                                        "~/Views/Error/{0}.cshtml".FormatWith(statusCodeName),                                        "~/Views/Error/General.cshtml",                                        statusCodeName,                                        "Error");          var controllerName = (string) filterContext.RouteData.Values["controller"];         var actionName = (string) filterContext.RouteData.Values["action"];         var model = new HandleErrorInfo(filterContext.Exception, controllerName, actionName);         var result = new ViewResult                          {                              ViewName = viewName,                              ViewData = new ViewDataDictionary<HandleErrorInfo>(model),                          };         result.ViewBag.StatusCode = statusCode;         return result;     }      protected string SelectFirstView(ControllerContext ctx, params string[] viewNames)     {         return viewNames.First(view => ViewExists(ctx, view));     }      protected bool ViewExists(ControllerContext ctx, string name)     {         var result = ViewEngines.Engines.FindView(ctx, name, null);         return result.View != null;     } }