How to replace "Error. An error occurred while processing your request."

Question

In my Web.config I have.

<customErrors mode="On" defaultRedirect="~/Errors/Unknown">
  <error statusCode="403" redirect="~/Errors/Forbidden"></error>
  <error statusCode="404" redirect="~/Errors/NotFound"></error>
</customErrors>

It works fine if I try to open a page that doesn't exist. (It redirects to my custom error page: ErrorsController.NotFound). When an unhandled exception occurs (in this case in LINQ Signle(...)). It doesn't go to ~/Errors/Unknown, but displays default message:

Error. An error occurred while processing your request.

How replace it with my ErrorsController.Unknown ?

http://stackoverflow.com/questions/16312588/in-asp-net-mvc-4-what-is-the-best-show-unhandled-exceptions-in-my-view I believe this question will help to answer yours. — newtonrd, Jul 28 '13 at 22:40
You might also find this helpful: http://stackoverflow.com/a/13905859/1373170 — Pablo Romeo, Jul 28 '13 at 23:00
Actually this helped: http://stackoverflow.com/questions/1171035/asp-net-mvc-custom-error-handling-application-error-global-asax — Andrzej Gis, Jul 29 '13 at 00:42

score 3 · Accepted Answer · edited May 23 '17 at 12:23

Thanks to this question I figured out how to do this. The code below is almost the same as the accepted answer's. The modification handles no HttpExceptions too.

Steps to make it work:

customErrors element in web.config will now be ignored

Paste the method below to your Global.axax.

protected void Application_Error(object sender, EventArgs e)
{
    Exception exception = Server.GetLastError();
    Response.Clear();

    var httpException = exception as HttpException;

    if (httpException != null)
    {
        string action;

        switch (httpException.GetHttpCode())
        {
            case 404:
                // page not found
                action = "NotFound";
                break;
            case 403:
                // forbidden
                action = "Forbidden";
                break;
            case 500:
                // server error
                action = "HttpError500";
                break;
            default:
                action = "Unknown";
                break;
        }

        // clear error on server
        Server.ClearError();

        Response.Redirect(String.Format("~/Errors/{0}", action));
    }else
    {
        // this is my modification, which handles any type of an exception.
        Response.Redirect(String.Format("~/Errors/Unknown")); 
    }
}

How to replace "Error. An error occurred while processing your request."

1 Answers1