Solved

Class Library Exception Passing To Other Class Library Or Executable?

Posted on 2012-12-22
6
358 Views
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
Comment
Question by:pointeman
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
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
PeopleSoft Has Never Been Easier

PeopleSoft Adoption Made Smooth & Simple!

On-The-Job Training Is made Intuitive & Easy With WalkMe's On-Screen Guidance Tool.  Claim Your Free WalkMe Account Now

 

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

Featured Post

Enroll in June's Course of the Month

June's Course of the Month is now available! Every 10 seconds, a consumer gets hit with ransomware. Refresh your knowledge of ransomware best practices by enrolling in this month's complimentary course for Premium Members, Team Accounts, and Qualified Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…
This article describes a simple method to resize a control at runtime.  It includes ready-to-use source code and a complete sample demonstration application.  We'll also talk about C# Extension Methods. Introduction In one of my applications…
Come and listen to Percona CEO Peter Zaitsev discuss what’s new in Percona open source software, including Percona Server for MySQL (https://www.percona.com/software/mysql-database/percona-server) and MongoDB (https://www.percona.com/software/mongo-…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

690 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question