application.exit, application.exitthread exit application problem

23 Nov 2004 10:39 PM

Mike Silver

I have a windows form application. It is accessing a backend SQL server. The
data access are wrapped in modules. If the data access failed, I wanted to
display a popup error message and then exit the application. I tried to use
Application.Exit(), Application.ExitThread, and Environment.Exit(). They all
have kind weird problem.
1. Applicaiton.Exit() This method is called within an exception block, after
displaying a message box to the user. It seems it is not doing anything. The
rest of code will be executed in order like nothing happened.

2. Application.ExitThread() The same as Application.Exit()

3. Thread.CurrentThread.Abort() This method will cause ThreadAbort
Exception, so I have to handle this exception from layer to layer.

4. Environment.Exit() In exception catch block, I display the message box,
and then call this method. This caused the application to exit, but the
message box just flashed and disappeared.

Thanks!

John

23 Nov 2004 10:43 PM

Serg

what happens if you say this.Close() from within your main form?

Show quote

"Mike Silver" wrote:

> I have a windows form application. It is accessing a backend SQL server. The
> data access are wrapped in modules. If the data access failed, I wanted to
> display a popup error message and then exit the application. I tried to use
> Application.Exit(), Application.ExitThread, and Environment.Exit(). They all
> have kind weird problem.
> 1. Applicaiton.Exit() This method is called within an exception block, after
> displaying a message box to the user. It seems it is not doing anything. The
> rest of code will be executed in order like nothing happened.
>
> 2. Application.ExitThread() The same as Application.Exit()
>
> 3. Thread.CurrentThread.Abort() This method will cause ThreadAbort
> Exception, so I have to handle this exception from layer to layer.
>
> 4. Environment.Exit() In exception catch block, I display the message box,
> and then call this method. This caused the application to exit, but the
> message box just flashed and disappeared.
>
> Thanks!
>
> John

24 Nov 2004 3:14 AM

Brian Hammer

I ran into something similar and had to remove the exit to another sub:

Private Sub SomeSub()
try
    'do the work and an error happens
catch er as exception
    ExitErrorApp
    exit sub
end try
End sub

private sub ExitErrorApp()
    application.exit
end sub

I thin I had to do this in my sub main because I was checking for an
instance of the same app. If it was running, I closed the current.

HTH,
Brian

Show quote

"Mike Silver" <MikeSil***@discussions.microsoft.com> wrote in message
news:023A80AF-0C2F-4E21-8DCD-C38684982418@microsoft.com...
>I have a windows form application. It is accessing a backend SQL server.
>The
> data access are wrapped in modules. If the data access failed, I wanted to
> display a popup error message and then exit the application. I tried to
> use
> Application.Exit(), Application.ExitThread, and Environment.Exit(). They
> all
> have kind weird problem.
> 1. Applicaiton.Exit() This method is called within an exception block,
> after
> displaying a message box to the user. It seems it is not doing anything.
> The
> rest of code will be executed in order like nothing happened.
>
> 2. Application.ExitThread() The same as Application.Exit()
>
> 3. Thread.CurrentThread.Abort() This method will cause ThreadAbort
> Exception, so I have to handle this exception from layer to layer.
>
> 4. Environment.Exit() In exception catch block, I display the message box,
> and then call this method. This caused the application to exit, but the
> message box just flashed and disappeared.
>
> Thanks!
>
> John