You're welcome
Steven Cheng
Microsoft Online Support
Get Secure!
www.microsoft.com/security
(This posting is provided "AS IS", with no warranties, and confers no
rights.)
--------------------
| From: "Leslie Mason" <
[email protected]>
| References: <
[email protected]>
<
[email protected]>
<
[email protected]>
<
[email protected]>
<
[email protected]>
| Subject: Re: Application_Start exceptions
| Date: Thu, 14 Jul 2005 08:59:07 -0500
| Lines: 211
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microsoft.public.dotnet.framework.aspnet:112179
| X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
|
| Thanks Steven,
|
| That is what I was looking for.
|
| Leslie
| | > Hi Leslie,
| >
| > For the detailed description on the internal exception handling
| > implementation, there hasn't any document focus on this. I've ever seen
| > some MSDN tech articles (about the related topic ) mentioned this. Also
| > here are some msdn reference which are helpful for understanding the
| > ASP.NET's runtime request processing and the pipeline:
| >
| > #The ASP.NET HTTP Runtime
| >
http://msdn.microsoft.com/library/en-us/dnaspp/html/dngrfTheASPNETHTTPRuntim
| > e.asp?frame=true
| >
| > #Securely Implement Request Processing, Filtering, and Content
Redirection
| > with HTTP Pipelines in ASP.NET
| >
http://msdn.microsoft.com/msdnmag/issues/02/09/HTTPPipelines/default.aspx
| >
| > In addition, I also recommend that you try using the .NET Reflector
tool
| > to
| > have a look at the reassemblied code of the HttpRuntime or Page class
(the
| > ProcessRequest method) which will also greatly help us understanding the
| > internal mechanism.
| >
| > Hope also helps. Thanks,
| >
| > Steven Cheng
| > Microsoft Online Support
| >
| > Get Secure!
www.microsoft.com/security
| > (This posting is provided "AS IS", with no warranties, and confers no
| > rights.)
| >
| >
| >
| >
| >
| >
| > --------------------
| > | Thread-Topic: Application_Start exceptions
| > | thread-index: AcWHwSJCXiyAY+QyQrGgdmgu0r4nzw==
| > | X-WBNR-Posting-Host: 128.158.92.43
| > | From: =?Utf-8?B?TGVzbGll?= <
[email protected]>
| > | References: <
[email protected]>
| > <
[email protected]>
| > <
[email protected]>
| > | Subject: Re: Application_Start exceptions
| > | Date: Wed, 13 Jul 2005 08:40:02 -0700
| > | Lines: 115
| > | Message-ID: <
[email protected]>
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| > microsoft.public.dotnet.framework.aspnet:111963
| > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > |
| > | Thanks Scott and Steve,
| > |
| > | This let's me know that I am not doing something wrong. I will put a
| > | try/catch block in my Application_Start routine to catch the
exceptions.
| > |
| > | One other thing, Do you know of any Microsoft documentation that
details
| > out
| > | the ASP.NET runtime processing you refer to below?
| > |
| > | Thanks,
| > |
| > | Leslie
| > |
| > | "Steven Cheng[MSFT]" wrote:
| > |
| > | > Thanks for Scott's inputs.
| > | >
| > | > Hi Leslie,
| > | >
| > | > As for the problem that exceptions in the Applicaion_Start event
can't
| > be
| > | > captured in Application_Error global event, it's limited by the
| > ASP.NET's
| > | > error handling and request processing model:
| > | >
| > | > The ASP.NET runtime will startup the application's
| > instance(Application
| > | > instance) if found the applicaiton being requested the first time,
and
| > then
| > | > the Applicaiton_Start event will be fired. This event's event
handler
| > code
| > | > is executed before any other request processing code(event the
| > httpmodule
| > | > code). And for Applicaiton_Error (the asp.net application global
| > exception
| > | > event ) , it is implemented by put a large
| > | >
| > | > try....catch.... block around the request Handler's ProcessRequest
| > method,
| > | > and then unhandled exception occurs, the runtime call the global
| > exception
| > | > handler( application_error) if exists in the catch block.
| > | >
| > | > So we can see that any unhandled exception thrown in
Application_Start
| > is
| > | > out of the control of the Application_Error handler, if we need to
| > capture
| > | > them, we have to explicitly put exception handling block in the
| > | > Applicaiton_Error handler.
| > | >
| > | > Thanks,
| > | >
| > | > Steven Cheng
| > | > Microsoft Online Support
| > | >
| > | > Get Secure!
www.microsoft.com/security
| > | > (This posting is provided "AS IS", with no warranties, and confers
no
| > | > rights.)
| > | >
| > | >
| > | >
| > | >
| > | > --------------------
| > | > | From: Scott Allen <
[email protected]>
| > | > | Subject: Re: Application_Start exceptions
| > | > | Date: Mon, 11 Jul 2005 20:31:29 -0400
| > | > | Message-ID: <
[email protected]>
| > | > | References: <
[email protected]>
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| > TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP12.phx.gbl
| > | > | Xref: TK2MSFTNGXA01.phx.gbl
| > | > microsoft.public.dotnet.framework.aspnet:111583
| > | > | X-Tomcat-NG: microsoft.public.dotnet.framework.aspnet
| > | > |
| > | > | Hi Leslie:
| > | > |
| > | > | Have you tried stepping through Application_Start with the
debugger?
| > | > |
| > | > | With Visual studio, set a breakpoint [1] in Application Start and
| > hit
| > | > | F5 to launch the debugger. There is also a whitepaper with some
| > links
| > | > | on using the debugger [2].
| > | > |
| > | > | You might also investigate Try / Catch blocks to handle the
| > exception
| > | > | and log it. You won't be able to get into Application_Error from
| > | > | Application_Start because the request processing hasn't started as
| > | > | yet, but you could still log the error.
| > | > |
| > | > | [1]
| > | > |
| > | >
| >
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vsdebug/htm
| > | > l/_asug_setting_breakpoints.asp
| > | > |
| > | > | [2]
| > | > |
| > | >
| >
http://msdn.microsoft.com/asp.net/using/migrating/phpmig/whitepapers/debuggi
| > | > ng.aspx
| > | > |
| > | > |
| > | > | --
| > | > | Scott
| > | > |
http://www.OdeToCode.com/blogs/scott/
| > | > |
| > | > | On Mon, 11 Jul 2005 15:43:03 -0700, Leslie
<
[email protected]>
| > | > | wrote:
| > | > |
| > | > | >I am attempting to handle errors by using Application_Error.
This
| > seems
| > | > to
| > | > | >work fine in most situations. However, if the exception occurs
| > during
| > | > the
| > | > | >Application_Start method, the stand error screen is displayed
and
| > my
| > | > custom
| > | > | >error handling in Application_Error does not run.
| > | > | >
| > | > | >Why does this occur, and is there something I can do to cause
| > | > | >Application_Error to be automatically invoked during an
| > | > Application_Start
| > | > | >exception?
| > | > |
| > | > |
| > | >
| > | >
| > |
| >
|
|
|
