[Mono-list] VB .NET and default instances

Chris Howie cdhowie at gmail.com
Fri Oct 30 12:07:20 EDT 2009

On Fri, Oct 30, 2009 at 9:46 AM, Styma, Robert E (Robert)
<robert.styma at alcatel-lucent.com> wrote:
> Hi,
>   I have inherited a VB.net application.  The application
> is currently developed under Visual Studio 2008 and is
> a GUI using a bunch of Windows Forms.  I would
> like to be able to run this under Linux and it appears I
> need Mono to do this.  In the documentation, I noticed
> the documentation mention that the "Default Instance"
> is not supported.  This application happens to use this
> feature in several places.

What documentation are you referring to?  I am unaware of any .NET or
C# feature called "default instance."

>   The way I have seen this done in Java is to have a
> "getInstance() method which accesses a static copy of the
> object and creates it the first time getInstance() is called.
> Would this be a workable mechanism to get the program
> to run under Mono?  It would be a pretty easy change to make.

Yes, this is the singleton pattern.  It has worked with Mono for as
long as I have used Mono.

>   The documentation seems to say that I can run the .exe
> created by Visual Studio with the Mono Runtime if I can get
> the libraries correct.  I have not been able to do this yet,
> but I am thinking I need to clean up the default instance issue
> first.  Is this the case?

It's hard to say whether or not that's the case without seeing some
sort of diagnostic output from Mono.  You might look at running your
app through MoMA <http://mono-project.com/MoMA> to see if it's doing
anything blatantly non-portable.
<http://www.mono-project.com/Guidelines:Application_Portability> is
also a good read in this regard.

Chris Howie

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