How to catch ConfigurationErrorsException for violating maxRequestLength ?

Question

I am limiting file size users can upload to the site from Web.config. As explained here, it should throw a ConfigurationErrorsException if size is not accepted. I tried to catch it from the action method or controller for upload requests but no luck. Connection is resetted and I can't get it to show an error page.

Answer 1

You cant catch error in action method becouse exception comes earlier, but you can catch it here

protected void Application_Error() {
     var lastError = Server.GetLastError();
     if(lastError !=null && lastError is HttpException && lastError.Message.Contains("exceed")) {
      Response.Redirect("~/errors/RequestLengthExceeded");
      }
    }   

Actualy when file size exceeds limits HttpException error arise.

There is also IIS limit on content - wich can't be catched in application. IIS 7 throws

HTTP Error 404.13 - Not Found The request filtering module is configured to deny a request that exceeds the request content length.

You can google it, there is a lot of information about this iis error.