Async process - Start Subroutine when finished

[Marcolino]

Hi All,
I'm using this code provided by Michael to run Async process:

http://groups.google.com/group/microsoft.public.dotnet.languages.vb/browse_thread/thread/3dda80ed45e6176e/606d19fccc330588#606d19fccc330588

Now I have a new need. I have to start a Soubroutine when the Async
process is finished.

Many Thanks.

--Marco

[rowe_newsgroups]

Re: Async process - Start Subroutine when finished

On Apr 8, 10:43 am, Marcolino <marco.pozzu... @gmail.comwrote :

Hi All,
I'm using this code provided by Michael to run Async process:
>
http://groups.google.com/group/micro...languages.vb/b...
>
Now I have a new need. I have to start a Soubroutine when the Async
process is finished.
>
Many Thanks.
>
--Marco

You can set up a callback from the BeginInvoke call that will fire
when the async process finishes. Then you can do whatever you need
from that method:

Here's a quick console demo app:

////////////////
Option Strict On

Module Module1

Public Delegate Sub AsyncDelegate()

Sub Main()
Console.WriteLi ne("Starting")
Dim worker As New AsyncDelegate(A ddressOf AsyncMethod)
worker.BeginInv oke(New AsyncCallback(A ddressOf
AfterAsyncMetho d), Nothing)
Console.WriteLi ne("Asnyc called")

Console.Read()
End Sub

Private Sub AfterAsyncMetho d(ByVal ar As IAsyncResult)
Console.WriteLi ne("AsyncMetho d finished. Do something else")
End Sub

Private Sub AsyncMethod()
Console.WriteLi ne("Async is working")
'// Simulate work
System.Threadin g.Thread.Sleep( 1500)
Console.WriteLi ne("Async is done working")
End Sub

End Module
////////////////

Thanks,

Seth Rowe [MVP]

[Spam Catcher]

Re: Async process - Start Subroutine when finished

rowe_newsgroups <rowe_email@yah oo.comwrote in news:424eb9ff-3910-40c0-
8bda-91d0741e3030@e3 9g2000hsf.googl egroups.com:

Private Sub AfterAsyncMetho d(ByVal ar As IAsyncResult)
Console.WriteLi ne("AsyncMetho d finished. Do something else")
End Sub

Should call EndInvoke here - to clean up the Async handler?

--
spamhoneypot@ro gers.com (Do not e-mail)

[kimiraikkonen]

Re: Async process - Start Subroutine when finished

On Apr 8, 5:43 pm, Marcolino <marco.pozzu... @gmail.comwrote :

Hi All,
I'm using this code provided by Michael to run Async process:
>
http://groups.google.com/group/micro...languages.vb/b...
>
Now I have a new need. I have to start a Soubroutine when the Async
process is finished.
>
Many Thanks.
>
--Marco

Marco,
You can also play with BackgroundWorke r control and its events such as
RunWorkerComple ted, ProgressChanged events if it helps you.

Regards,

Onur Güzel

[Marcolino]

Re: Async process - Start Subroutine when finished

On 8 Apr, 18:50, kimiraikkonen <kimiraikkone.. .@gmail.comwrot e:

On Apr 8, 5:43 pm, Marcolino <marco.pozzu... @gmail.comwrote :
>

Hi All,
I'm using this code provided by Michael to run Async process:

>

http://groups.google.com/group/micro...languages.vb/b...

>

Now I have a new need. I have to start a Soubroutine when the Async
process is finished.

>

Many Thanks.

>

--Marco

>
Marco,
You can also play with BackgroundWorke r control and its events such as
RunWorkerComple ted, ProgressChanged events if it helps you.
>
Regards,
>
Onur Güzel

Hi I tryed this:
worker.BeginInv oke(New AsyncCallback(A ddressOf AfterAsyncMetho d),
Nothing)

but i have a little problem.
During sub AfterAsyncMetho d() i need to populate a listview present on
main form. This is not possible because I cannot execute cross tread
operation.
I need that AfterAsyncMetho d() will be executed on the main tread of
the application, after my async process is finished.

Thanks a lot