Exception Handling in a Class or Worker Thread (.NET 2.0)

Hi Vadym

Thank you for your answer.

Now my next questions:
I use the try{} catch{} block in my class. Also, I catch the
CryptographicException. When a exception occurs in my class, should I throw a
new exception within the catch block? Should I raise a custom event? Or
should I write the exception message in a public property so that I can use
the message in the main thread?

I would like to know which is the best way (the Microsoft recommend way) to
handle exceptions and work with this exceptions.
Thanks and Regards,
Dominik

-----------------------------
http://blogs.ecreation.ch
"Vadym Stetsyak" wrote:

Hello, Zemp!

ZDWhat is the correct (or best) way to handle (catch) exceptions in a
ZDclass or in a worker thread in .NET 2.0?
ZDIn my project, I've a class which do some cryptographic operations.
ZDThis class runs also in a seperate thread (not main thread). Now, how
ZDshould I handle the possible exceptions in this class?

IMO it depends on the logic of your application.
Since, your thread is doing some security related stuff, exception there may be
treated as fatal error and application will exit with appropriate status
message in the logs ( EventLog, etc).

OTOH if you received exception and you're able to recover, then
catch(...) block can simply log exception in the EventLog or any other log.

As you can see there are various ways how to handle exception.
If you will provide more specific question with more context,
then the answer will be more concrete.

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot

Hi Vadym

It depends on what you want to do with that exception. If you want to show it to
user then you can display it in the GUI using Control.Invoke technique (
multithreading under winforms ).

That means that I have to raise my custom event (when I would like to use
the Control.Invoke method)?

Regards,
Dominik

-----------------------------
http://blogs.ecreation.ch
"Vadym Stetsyak" wrote:

Hello, Zemp!

ZDNow my next questions:
ZDI use the try{} catch{} block in my class. Also, I catch the
ZDCryptographicException. When a exception occurs in my class, should I
ZDthrow a new exception within the catch block?

It depends on you, you can rethrow the same exception, you can create
new Exception object and throw it instead. But generally if you want
to notify the code down in callstack then you can simply rethrow an exception.

But generally, if your only rethrowing then catch has no sense...

ZDShould I raise a custom event? Or should I write the exception message
ZDin a public property so that I can use the message in the main thread?

It depends on what you want to do with that exception. If you want to show it to
user then you can display it in the GUI using Control.Invoke technique (
multithreading under winforms ). If you don't want to notify user about exceptions,
you can log and simply "swallow" that exception.

ZDI would like to know which is the best way (the Microsoft recommend
ZDway) to handle exceptions and work with this exceptions.

Take a look at ( http://msdn.microsoft.com/msdnmag/is...0/Reliability/ )
--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot

Hello, Zemp!

ZDThat means that I have to raise my custom event (when I would like to
ZDuse the Control.Invoke method)?

Custom event will execute only if there are subscribers on it ( handlers ). And this
handler(s) will Control.Invoke. Or you can directly use Control.Invoke without custom event.

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot.com

Hi Vadym

You wrote: Or you can directly use Control.Invoke without custom event.

How can I do this? Do you have an example?

Regards,
Dominik

-----------------------------
http://blogs.ecreation.ch
"Vadym Stetsyak" wrote:

Hello, Zemp!

ZDThat means that I have to raise my custom event (when I would like to
ZDuse the Control.Invoke method)?

Custom event will execute only if there are subscribers on it ( handlers ). And this
handler(s) will Control.Invoke. Or you can directly use Control.Invoke without custom event.

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot

Hello, Zemp!

Take a look at
( http://www.codeproject.com/csharp/winformthreading.asp )

--
Regards, Vadym Stetsyak
www: http://vadmyst.blogspot.com