Question about loading class elements dynamically

**Michel Posseth [MCP]** · Sep 21 '08, 10:25 AM

Re: Question about loading class elements dynamically

Easyest way in my opinion would be that you define a generic interface for
the class in the by you descibed situatien if lots of changes might happen
and you do not want to redeploy , i guess a invocation and comunication
interface to your main app would be the way to go

If you have defined this interface you can invoke anny plugin dll that
contains this interface , so in basic the once defined invocation interface
can never change cause then you need to redeploy your app however everything
that is beyond the interface can be changed to anything you like

to help you get started investigate "reflection " techniques

HTH

Michel Posseth [MCP]

"Anthony P." <papillion@gmai l.comschreef in bericht
news:bf6b4403-8637-4fc1-a2c4-785edd65c4ee@c6 5g2000hsa.googl egroups.com...

Hello Everyone,
>
I'm totally lost and I hope someone can help me out or point me to
something that can. Here's the deal:
>
I have an application that will implement a 'plugin' archetecture of
sorts. The application requires the user to fill out various forms.
Each agency that we deploy the application to will have different
forms and those forms will change over time. If we build each form
into the application through hard code, changing, adding, or removing
forms requires that the entire application be recompiled and
reinstalled.
>
So what I'm doing is designing the forms as part of a class library.
So let's take filling out a log for example. I'll create a new class
library and then add three Windows forms to it. Let's call them
frmStep1, frmStep2, and frmStep3 (all which pass data amongst
themselves). I build my class library and let's say that is called
LogFormLib.dll. What I need to happen is that I can distribute this
dll to my users, have them drop it in a special directory and have my
application automatically pick it up and make it available via the
menu system. This way, new forms can be added by simply distributing
a new DLL that contains the code.
>
I know this sounds easy, and I'm sure it is somewhat, but I am totally
lost. How can I do this? Are there any tutorials?
>
Thanks!
Anthony
>

**Anthony P.** · Sep 21 '08, 08:55 PM

Re: Question about loading class elements dynamically

Thank you Michael. This seems a bit complex but exactly what I need!
So, I know how I'm going to spend my Sunday! lol

Thanks Again,
Anthony

**Anthony P.** · Sep 21 '08, 11:15 PM

Re: Question about loading class elements dynamically

Michael,

I thought everything was going to be fine but I'm already confused so
let me ask a few pointed questions if you don't mind. I think if I get
these answered, I will be well on my way to properly using reflections
and building my plugin archetcture:

1. Do I define my interface in a seperate class file that will be
included in my main applications project?

2. What kinds of informatition do I need to put in my interface class?

For example:
Any given plugin will contain a bunch of Windows Forms that will
interact with each other AND the main application that loads them. So
let's say I have a menu item that loads form1 from an external dll
file. Form1 will have multiple controls on it that will take data from
the user and then call from2 (also contained in this external dll).

The only cavaet is that each plug-in will need to access variables
definied in the main application as Friends.

3. If I understand this correctly, I will basically be doing three
things:
1. Creating my main application.
2. Creating a SEPERATE class library that defines an interface
(this dll will be distributed with my main app)
3. Create seperate plugins that implement that interface.

I suppose I am maybe getting a small understanding of how this is
going to work but I still need a small bit of directlion.

Thanks in Advance
Anthony

**Steve Gerrard** · Sep 21 '08, 11:35 PM

Re: Question about loading class elements dynamically

Anthony P. wrote:

Hello Everyone,
>
I'm totally lost and I hope someone can help me out or point me to
something that can. Here's the deal:
>
I have an application that will implement a 'plugin' archetecture of
sorts. The application requires the user to fill out various forms.
Each agency that we deploy the application to will have different
forms and those forms will change over time. If we build each form
into the application through hard code, changing, adding, or removing
forms requires that the entire application be recompiled and
reinstalled.
>
So what I'm doing is designing the forms as part of a class library.
So let's take filling out a log for example. I'll create a new class
library and then add three Windows forms to it. Let's call them
frmStep1, frmStep2, and frmStep3 (all which pass data amongst
themselves). I build my class library and let's say that is called
LogFormLib.dll. What I need to happen is that I can distribute this
dll to my users, have them drop it in a special directory and have my
application automatically pick it up and make it available via the
menu system. This way, new forms can be added by simply distributing
a new DLL that contains the code.
>
I know this sounds easy, and I'm sure it is somewhat, but I am totally
lost. How can I do this? Are there any tutorials?
>
Thanks!
Anthony

It occurs to me that you might think of this application the other way around.

If you build the "main" application as a dll, then you can build a series of
custom executable apps that use that dll. All the main processing, and perhaps
the main form, would be in the dll. Each custom app would use the dll, and
include the specialized forms and processes it needs.

I think that approach might make the whole thing easier to organize and
implement, than trying to do a plug-in architecture.

**Gillard** · Sep 22 '08, 07:15 PM

Re: Question about loading class elements dynamically

Google Search

http://www.google.com/search?hl=fr&q=plugin+%2B+vb.net&meta=&rlz=1W1GPRE_fr

"Anthony P." <papillion@gmai l.comwrote in message
news:bf6b4403-8637-4fc1-a2c4-785edd65c4ee@c6 5g2000hsa.googl egroups.com...

Hello Everyone,
>
I'm totally lost and I hope someone can help me out or point me to
something that can. Here's the deal:
>
I have an application that will implement a 'plugin' archetecture of
sorts. The application requires the user to fill out various forms.
Each agency that we deploy the application to will have different
forms and those forms will change over time. If we build each form
into the application through hard code, changing, adding, or removing
forms requires that the entire application be recompiled and
reinstalled.
>
So what I'm doing is designing the forms as part of a class library.
So let's take filling out a log for example. I'll create a new class
library and then add three Windows forms to it. Let's call them
frmStep1, frmStep2, and frmStep3 (all which pass data amongst
themselves). I build my class library and let's say that is called
LogFormLib.dll. What I need to happen is that I can distribute this
dll to my users, have them drop it in a special directory and have my
application automatically pick it up and make it available via the
menu system. This way, new forms can be added by simply distributing
a new DLL that contains the code.
>
I know this sounds easy, and I'm sure it is somewhat, but I am totally
lost. How can I do this? Are there any tutorials?
>
Thanks!
Anthony
>

Question about loading class elements dynamically

Question about loading class elements dynamically

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