Problem in Application_Error

[Michael]

Using some example code I've found, I'm trying to do the custom error page
thing.

I have the following in global.asax..

Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)
Dim oErr As System.Exception = Server.GetLastError()
Session("LastError") = oErr
End Sub

This throws an error and winds up back in Application_Error. When I get the
error using Server.GetLastError().GetBaseException() everything works as it
should, but the examples I've followed use GetBaseError() in the custom
error page code.

Can someone please explain this to me?

Thanks

 

[Karl Seguin]

Michael:
Are you simply asking what the difference between GetBaseException and
GetBaseError is? I don't know what GetBaseError is, it isn't part of the
framework and must be some custom implementatin that the example you saw
used....

Karl

 

[Michael]

My typo.. there is no GetBaseError, it should be GetBaseException().

The question is why does Session("LastError") =
Server.GetLastError().GetBaseException() work correctly and
Session("LastError") = Server.GetLastError() not work?

 

[Karl Seguin]

Michael:
By the time an exception gets to the Application_Error event, it's been
rebundled as an HttpUnhandledException. Server.GetLastError() will always
return an instance of HttpUnhandledException which really isn't what you
want. Server.GetLastError().GetBaseException() returns the actual exception
(the base exception) which initially caused the error.

In other words a level of indirection is created and this is just how you
get back the piece of information you are really after.

Karl

 

[Michael]

I understand now. Thanks Karl.

Michael:
By the time an exception gets to the Application_Error event, it's been
rebundled as an HttpUnhandledException. Server.GetLastError() will always
return an instance of HttpUnhandledException which really isn't what you
want. Server.GetLastError().GetBaseException() returns the actual exception
(the base exception) which initially caused the error.

In other words a level of indirection is created and this is just how you
get back the piece of information you are really after.

Karl

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