Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Dynamic Control Creation

Posted on 2002-07-02
8
Medium Priority
?
237 Views
Last Modified: 2010-04-15
I would like to dynamically load a control, a control that I don;t know of at desgin-time.
In VB6 there was a Controls.Add were u suplied a ClsID and the control was loaded.
There must be something like this in C#, a way to load at run-time a dll with a UserControl in it and be able to put it on screen.
0
Comment
Question by:Azmodan
  • 5
  • 3
8 Comments
 
LVL 4

Accepted Solution

by:
kpkp earned 200 total points
ID: 7124230
sounds like you need to use the Activator.CreateInstance method...

check out

http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemActivatorClassCreateInstanceTopic.asp
0
 

Author Comment

by:Azmodan
ID: 7124675
yes.this seems to be the way to go, but i couldn;t make it work

hdlSample=Activator.CreateInstance("C:\\Simplex.dll","Simplex.UserControl1");

raises an exception:  File or assembly name C:\Simplex.dll, or one of its dependencies, was not found.

what am i doing wrong?
0
 
LVL 4

Expert Comment

by:kpkp
ID: 7124705
Are you including a refernce to simplex.dll in your project (or including it in the csc command if you're not using vs.net)?  You need to do this - or register simplex.dll in the GAC.
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:Azmodan
ID: 7124739
No,thats the whole point... to load a control at runtime!!

So, just with code, not by adding it to the references at design-time.

Can this be done without the GAC? By giving it the Asembly, or adding it's reference at run time...

0
 
LVL 4

Expert Comment

by:kpkp
ID: 7124917
If your assembly that you want to use dynamically isn't in the GAC, then it must be in the same directory as the calling application.  Also - don't include the path or .dll extension in the CreateInstance() call.
0
 

Author Comment

by:Azmodan
ID: 7126341
yeah..that seams to work. If i don't put the .dll in its name, it takes it from the current directory.

But... the CreateInstance returns an object or ObjectHandle. If I want to put the loaded control on the form, I need to use Controls.Add... which takes a Windows.Forms.Control. And the system won;t cast object to control. Is there a way?
0
 

Author Comment

by:Azmodan
ID: 7126351
no..i got it
ObjectHandle.Unwrap.. returns a castable pointer. And it can be casted to Forms.Control
0
 

Author Comment

by:Azmodan
ID: 7126473
10x

i'll figure out the details
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Introduction Although it is an old technology, serial ports are still being used by many hardware manufacturers. If you develop applications in C#, Microsoft .NET framework has SerialPort class to communicate with the serial ports.  I needed to…
This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …
Loops Section Overview
Suggested Courses

886 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