Getting correct Response.StatusCode from Application_OnError (ASP.NET MVC)

Question

I'm trying to create some basic logging for unhandled exceptions in my ASP.NET MVC application, but as I'm using IIS6 all requests come through .NET. Now while I agree that missing images are an important thing to flag, they aren't show-stoppers and so I'd like to set the event priority to high for 404s unless they are images (which will get medium priority).

The problem is that in Application_OnError the Response.StatusCode is 200, but the final result sent out is 404. To this end, I don't seem to be able to watch out for 404s to set the appropriate priority.

Is there a way to tell what the StatusCode is going to be?

Answer 1

You would have to send all traffic through to the .net isapi layer and do a manual 404 check yourself (if file exists) I would imagine

Answer 2

You can get it via Context.Server.GetLastError():

if ((Context.Server.GetLastError() is HttpException) && ((Context.Server.GetLastError() as HttpException).GetHttpCode() == 404))
{
    // do something
}