ASP NET MVC 404 Error Handling

Question

Possible Duplicate    How can I properly handle 404 in ASP NET MVC        I ve made the changes outlined at 404 Http error handler in Asp Net MVC  RC 5  and I m still getting the standard 404 error page  Do I need to change something in IIS

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Looks like this is the best way to catch everything   How can I properly handle 404 in ASP NET MVC

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I ve investigated A LOT on how to properly manage 404s in MVC  specifically MVC3   and this  IMHO is the best solution I ve come up with   In global asax   public class MvcApplication   HttpApplication       protected void Application EndRequest                 if  Context Response StatusCode    404                        Response Clear                 var rd   new RouteData                rd DataTokens  area      AreaName      In case controller is in another area             rd Values  controller      Errors               rd Values  action      NotFound                IController c   new ErrorsController                c Execute new RequestContext new HttpContextWrapper Context   rd                        ErrorsController   public sealed class ErrorsController   Controller       public ActionResult NotFound                 ActionResult result           object model   Request Url PathAndQuery           if   Request IsAjaxRequest                result   View model           else             result   PartialView   NotFound   model            return result            Edit   If you re using IoC  e g  AutoFac   you should create your controller using   var rc   new RequestContext new HttpContextWrapper Context   rd   var c   ControllerBuilder Current GetControllerFactory   CreateController rc   Errors    c Execute rc     Instead of  IController c   new ErrorsController    c Execute new RequestContext new HttpContextWrapper Context   rd       Optional   Explanation   There are 6 scenarios that I can think of where an ASP NET MVC3 apps can generate 404s   Generated by ASP NET    Scenario 1  URL does not match a route in the route table    Generated by ASP NET MVC    Scenario 2  URL matches a route  but specifies a controller that doesn t exist  Scenario 3  URL matches a route  but specifies an action that doesn t exist    Manually generated    Scenario 4  An action returns an HttpNotFoundResult by using the method HttpNotFound    Scenario 5  An action throws an HttpException with the status code 404  Scenario 6  An actions manually modifies the Response StatusCode property to 404    Objectives    A  Show a custom 404 error page to the user   B  Maintain the 404 status code on the client response  specially important for SEO    C  Send the response directly  without involving a 302 redirection    Solution Attempt  Custom Errors   lt system web gt       lt customErrors mode  On  gt           lt error statusCode  404  redirect    Errors NotFound   gt       lt  customErrors gt   lt  system web gt    Problems with this solution    Does not comply with objective  A  in scenarios  1    4    6   Does not comply with objective  B  automatically  It must be programmed manually  Does not comply with objective  C     Solution Attempt  HTTP Errors   lt system webServer gt       lt httpErrors errorMode  Custom  gt           lt remove statusCode  404   gt           lt error statusCode  404  path  App Errors NotFound  responseMode  ExecuteURL   gt       lt  httpErrors gt   lt  system webServer gt    Problems with this solution    Only works on IIS 7   Does not comply with objective  A  in scenarios  2    3    5   Does not comply with objective  B  automatically  It must be programmed manually    Solution Attempt  HTTP Errors with Replace   lt system webServer gt       lt httpErrors errorMode  Custom  existingResponse  Replace  gt           lt remove statusCode  404   gt           lt error statusCode  404  path  App Errors NotFound  responseMode  ExecuteURL   gt       lt  httpErrors gt   lt  system webServer gt    Problems with this solution    Only works on IIS 7   Does not comply with objective  B  automatically  It must be programmed manually  It obscures application level http exceptions  E g  can t use customErrors section  System Web Mvc HandleErrorAttribute  etc  It can t only show generic error pages    Solution Attempt customErrors and HTTP Errors   lt system web gt       lt customErrors mode  On  gt           lt error statusCode  404  redirect    Errors NotFound   gt       lt  customError gt   lt  system web gt    and   lt system webServer gt       lt httpErrors errorMode  Custom  gt           lt remove statusCode  404   gt           lt error statusCode  404  path  App Errors NotFound  responseMode  ExecuteURL   gt       lt  httpErrors gt   lt  system webServer gt    Problems with this solution    Only works on IIS 7   Does not comply with objective  B  automatically  It must be programmed manually  Does not comply with objective  C  in scenarios  2    3    5     People that have troubled with this before even tried to create their own libraries  see http   aboutcode net 2011 02 26 handling-not-found-with-asp-net-mvc3 html   But the previous solution seems to cover all the scenarios without the complexity of using an external library

User · Answer

Yet another solution   Add ErrorControllers or static page to with 404 error information   Modify your web config  in case of controller     lt system web gt       lt customErrors mode  On   gt          lt error statusCode  404  redirect    Errors Error404    gt       lt  customErrors gt   lt  system web gt    Or in case of static page   lt system web gt       lt customErrors mode  On   gt           lt error statusCode  404  redirect    Static404 html    gt       lt  customErrors gt   lt  system web gt    This will handle both missed routes and missed actions

User · Answer

In IIS  you can specify a redirect to  certain  page based on error code  In you example  you can configure 404 -   Your customized 404 error page

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What I can recomend is to look on FilterAttribute  For example MVC already has HandleErrorAttribute  You can customize it to handle only 404  Reply if you are interesed I will look example   BTW   Solution with last route  that you have accepted in previous question does not work in much of the situations  Second solution with HandleUnknownAction will work but require to make this change in each controller or to have single base controller   My choice is a solution with HandleUnknownAction

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The response from Marco is the BEST solution  I needed to control my error handling  and I mean really CONTROL it  Of course  I have extended the solution a little and created a full error management system that manages everything  I have also read about this solution in other blogs and it seems very acceptable by most of the advanced developers   Here is the final code that I am using   protected void Application EndRequest                 if  Context Response StatusCode    404                        var exception   Server GetLastError                var httpException   exception as HttpException              Response Clear                Server ClearError                var routeData   new RouteData                routeData Values  controller      ErrorManager               routeData Values  action      Fire404Error               routeData Values  exception     exception              Response StatusCode   500               if  httpException    null                                Response StatusCode   httpException GetHttpCode                    switch  Response StatusCode                                        case 404                          routeData Values  action      Fire404Error                           break                                                 Avoid IIS7 getting in the middle             Response TrySkipIisCustomErrors   true              IController errormanagerController   new ErrorManagerController                HttpContextWrapper wrapper   new HttpContextWrapper Context               var rc   new RequestContext wrapper  routeData               errormanagerController Execute rc                     and inside my ErrorManagerController            public void Fire404Error HttpException exception                  you can place any other error handling code here         throw new PageNotFoundException  page or resource            Now  in my Action  I am throwing a Custom Exception that I have created  And my Controller is inheriting from a custom Controller Based class that I have created  The Custom Base Controller was created to override error handling  Here is my custom Base Controller class   public class MyBasePageController   Controller       protected override void OnException ExceptionContext filterContext                filterContext GetType            filterContext ExceptionHandled   true          this View  ErrorManager   filterContext  ExecuteResult this ControllerContext           base OnException filterContext             The  ErrorManager  in the above code is just a view that is using a Model based on ExceptionContext   My solution works perfectly and I am able to handle ANY error on my website and display different messages based on ANY exception type

[asp.net-mvc] ASP.NET MVC 404 Error Handling

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