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Class Library Exception Passing To Other Class Library Or Executable?

Posted on 2012-12-22
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Last Modified: 2012-12-27
I want to learn the absolute correct way to pass exceptions from Class Library .dll to other .dll or Executable (Form1). I don't receive the actual .dll exception, instead I receive a general try/catch exception from the Form1 attempt to use the .dll. Help!

[Example Summary]
Click a button on Form1 to clear the local Queue without first specifying the Queue name will cause an exception.
Seems to me the the .dll CreateQueue() exception should 'bubble-up' to Form1.

Does this make sense?

Q1. How do I pass the .dll exception to the .exe (MyForm1)?
Q2. How do I pass the .dll exception to another .dll then to .exe (MyForm1)?

[MyForm1.exe]
public static void ClearQueue()
        {
            msgQueue.QueueName = ""; //intentionally blank for testing purposes
            msgQueue.ClearQueue();
        }


[MyQueueManager.dll] (referenced by MyForm1.exe)
        public static void CreateQueue()
        {
            try
            {
                if (MessageQueue.Exists(_queueName))
                    msgQueue = new MessageQueue(_queueName);
                else
                    msgQueue = MessageQueue.Create(_queueName);
            }
            catch (MessageQueueException ex)
            {
                throw new Exception("MsmqManager.MSMQueue.CreateQueue() Exception: ", ex);
            }
        }

        public static void ClearQueue()
        {
            CreateQueue();

            msgQueue.Purge();
        }
0
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Question by:pointeman
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6 Comments
 
LVL 18

Accepted Solution

by:
Gary Davis earned 500 total points
ID: 38715724
Since your dll is doing a throw, your call to msgQueue will need a try/catch to know the details of the exception being thrown.

Another alternative is to have an Error property within the MessageQueue class and that would have to be set with the error information if an error occurs instead of issuing a throw. Then you will need to test the Error property at various points and act as needed.

Gary Davis
0
 

Author Comment

by:pointeman
ID: 38715761
Q. Do you think the .dll 'Catch' is correct or do you recommend another way?
0
 
LVL 18

Expert Comment

by:Gary Davis
ID: 38716052
The try/catch in the dll looks correct to me.
0
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Author Comment

by:pointeman
ID: 38716084
Q. Do you prefer throw ex; vs my code example?

I've also been working with throw ex.Innexcepion; as well.
0
 
LVL 18

Expert Comment

by:Gary Davis
ID: 38716224
I'm not sure I understand. Your example does issue a throw.
0
 

Author Closing Comment

by:pointeman
ID: 38725618
Thx
0

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