在IIS6上使用asp.net C＃3.5自定义404页面

Question

for error handling I have a few lines of code for catching every error in the global.asax : void Application_Error(object sender, EventArgs e) the content of the function looks like this:

try
    {
       Exception objErr = Server.GetLastError().GetBaseException();

       if (!(objErr is HttpException))
       {
           shop.BLL.Utility.Errorlog.WriteError(objErr, "Global.asax caught an Exception");
       }
       else
       {
           HttpException hex = (HttpException)objErr;
           if (hex.ErrorCode == 404)
               Response.Redirect("404.aspx?msg=" + hex.Message);
           else
           {
               shop.BLL.Utility.Errorlog.WriteError(hex, "Global.asax caught an HttpException code: " + hex.ErrorCode);
           }
       }

    }
    catch { }

    Server.ClearError();

now here is the thing: when I go to blabla.aspx , which does not exists, it ends up on line shop.BLL.Utility.Errorlog.WriteError(hex, "Global.asax caught an HttpException code: " + hex.ErrorCode); and the value of the errorcode is -2147467259

Why isn't it a 404?

Answer 1

I think you should check with GetHttpCode() method.

 HttpException hex = (HttpException)objErr;
 if (hex.GetHttpCode() == 404)
     Response.Redirect("404.aspx?msg=" + hex.Message);

Answer 2

The page not found doesn't throw an exception, the 404 error is an Http response code. If you are trying to set up a custom error page for 404 handling, you can set it up using the

<customErrors>

tag in your web.config

have a look at these articles...

http://aspnetresources.com/articles/CustomErrorPages and http://www.asp.net/hosting/tutorials/displaying-a-custom-error-page-cs

Dave

Answer 3

From MSDN docs :

ErrorCode Gets the HRESULT of the error. (Inherited from ExternalException ).

GetHttpCode() Gets the HTTP response status code to return to the client.

The HRESULT 0x80004005 means Generic Error .

Answer 4

I don't think you want to use ErrorCode - that is for the internal error. Try using GetHttpCode() on your HttpException object. That should return the 404 you are looking for.

if (hex.GetHttpCode() == 404)