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" <
mason@newsgroup.nospam>
| References: <
C73572F6-BB5A-46A1-9E30-7781F77BA455@microsoft.com>
<
cd36d1dj6oja4cpkg9ivv0a6mv4lrapak9@4ax.com>
<
dLnfHSrhFHA.1336@TK2MSFTNGXA01.phx.gbl>
<
03D44B5F-8962-4104-AA2E-4A37382DA34B@microsoft.com>
<Dz8$
6UDiFHA.3296@TK2MSFTNGXA01.phx.gbl>
| Subject: Re: Application_Start exceptions
| Date: Thu, 14 Jul 2005 08:59:07 -0500
| Lines: 211
| X-Priority: 3
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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
| "Steven Cheng[MSFT]" <
stcheng@online.microsoft.com>wrote in message
| news:Dz8$
6UDiFHA.3296@TK2MSFTNGXA01.phx.gbl...
|>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
|>
msdn.microsoft.com/library/en-us/dnaspp/html/dngrfTheASPNETHTTPRuntim">
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
|>
msdn.microsoft.com/msdnmag/issues/02/09/HTTPPipelines/default.aspx">
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?= <
mason@newsgroup.nospam>
|>| References: <
C73572F6-BB5A-46A1-9E30-7781F77BA455@microsoft.com>
|><
cd36d1dj6oja4cpkg9ivv0a6mv4lrapak9@4ax.com>
|><
dLnfHSrhFHA.1336@TK2MSFTNGXA01.phx.gbl>
|>| Subject: Re: Application_Start exceptions
|>| Date: Wed, 13 Jul 2005 08:40:02 -0700
|>| Lines: 115
|>| Message-ID: <
03D44B5F-8962-4104-AA2E-4A37382DA34B@microsoft.com>
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|>| Xref: TK2MSFTNGXA01.phx.gbl
|>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 <
scott@nospam.odetocode.com>
|>|>| Subject: Re: Application_Start exceptions
|>|>| Date: Mon, 11 Jul 2005 20:31:29 -0400
|>|>| Message-ID: <
cd36d1dj6oja4cpkg9ivv0a6mv4lrapak9@4ax.com>
|>|>| References: <
C73572F6-BB5A-46A1-9E30-7781F77BA455@microsoft.com>
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|>|>| 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" rel="nofollow" target="_blank">msdn.microsoft.com/library/default.asp=/library/en-us/vsdebug/htm
|>|>l/_asug_setting_breakpoints.asp
|>|>|
|>|>| [2]
|>|>|
|>|>
|>
msdn.microsoft.com/asp.net/using/migrating/phpmig/whitepapers/debuggi">
msdn.microsoft.com/asp.net/using/migrating/phpmig/whitepapers/debuggi
|>|>ng.aspx
|>|>|
|>|>|
|>|>| --
|>|>| Scott
|>|>|
www.OdeToCode.com/blogs/scott/">
www.OdeToCode.com/blogs/scott/
|>|>|
|>|>| On Mon, 11 Jul 2005 15:43:03 -0700, Leslie
<
mason@newsgroup.nospam>
|>|>| 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?
|>|>|
|>|>|
|>|>
|>|>
|>|
|>
|
|
|
-
