HResult property

[Guest]

The exception class has a protected property HResult. If I want to catch a particular exception, I need to know it's HResult and I need to access the HResult.

Every attempt I've made to access it has failed. When I hover my mouse over the code the message is something like "Hresult is not accessible under these circumstances because it is a protected property.

The second problem is that only a few exceptions have a 'name'. It seems amazing to me that in the 4+GB MSDN library, I can't find a listing of Hresults and the errors they correspond to. Either there is a listing and I just can't find it, or Microsoft has been terribly negligent

Can somebody help me on both these matters

polynomial5d

 

[Alvin Bruney [MVP]]

Unless i misunderstood you (in that case please clarify), microsoft .net has
moved away from COM style results. Instead you can only catch exception
objects, not hresults.

Typically, when unmanaged code encounters an error, the result is an HRESULT
type. Managed code converts this hresult into an exception and then throws
it. Consequently, you cannot trap for an hresult error and you cannot access
it directly either. It is available if you extend the exception object. For
obvious reasons, the hresult way of trapping and recording run-time
exceptions is problematic, error prone and not cross language friendly at
best.

--
Regards,
Alvin Bruney [ASP.NET MVP]
Got tidbits? Get it here...
http://tinyurl.com/27cok

The exception class has a protected property HResult. If I want to catch

a particular exception, I need to know it's HResult and I need to access the
HResult.

Every attempt I've made to access it has failed. When I hover my mouse

over the code the message is something like "Hresult is not accessible under
these circumstances because it is a protected property."

The second problem is that only a few exceptions have a 'name'. It seems

amazing to me that in the 4+GB MSDN library, I can't find a listing of
Hresults and the errors they correspond to. Either there is a listing and I
just can't find it, or Microsoft has been terribly negligent.

 

[Guest]

Then I still have the problem of a listing of all exceptions. Nowhere can I find such a list. Furthermore, I know some oledbexceptions don't have a 'name' at all. For example, the duplicate key exception, which I can only identify by its sqlstate = 3022. This seems a step backwards. How can I catch exceptions if I don't know their names, if they have no names, etc

polynomial5d

 

[Alvin Bruney [MVP]]

You may be looking for this
http://msdn.microsoft.com/library/d...n-us/cpguide/html/cpconHRESULTsExceptions.asp

this provides an overview of the architecture
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/exceptdotnet.asp

--
Regards,
Alvin Bruney [ASP.NET MVP]
Got tidbits? Get it here...
http://tinyurl.com/27cok

Then I still have the problem of a listing of all exceptions. Nowhere can

I find such a list. Furthermore, I know some oledbexceptions don't have a
'name' at all. For example, the duplicate key exception, which I can only
identify by its sqlstate = 3022. This seems a step backwards. How can I
catch exceptions if I don't know their names, if they have no names, etc.

 

[Guest]

Thank you very much, Alvin

I added the links to my favorites microsoftarticles/exceptions. It'll take some reading and testing

polynomial5d