Instantiating ASP.NET user controls by name | Tech Off

rhm

Hi,

I'm wondering if it's possible to instantiate an ASP.NET control by name at runtime and have the ASP.NET system look for the .ascx file and compile it into an assembly if necessary?

To clarify, I want to write a function that will take a string that is the name of a control and return an instance of that control without having to compile that control into an assembly in advance. I also want it to get the lastest version of the control automatically if the .ascx file is updated on disk. Is anything like this possible?

Sven Groot
My name has 9 letters. Coincidence? I think not...

Yep, it's possible:

Control userControl = LoadControl("~/path/to/usercontrol.ascx");

rhm

Thanks Sven!

odujosh
Need Microsoft SUX now!

Heres a better way:

ASP.usercontrols_basicpanel_ascx myControl = new ASP.usercontrols_basicpanel_ascx();

Where user control is located:
~/usercontrols/basicpanel.ascx

Sven Groot
My name has 9 letters. Coincidence? I think not...

odujosh wrote:
Heres a better way:

ASP.usercontrols_basicpanel_ascx myControl = new ASP.usercontrols_basicpanel_ascx();

Where user control is located:
~/usercontrols/basicpanel.ascx

Doesn't work. You're only instantiating the code behind class that way, the .ascx part of the control doesn't get compiled.

Disco Patrick

In reply to Sven Groot

#Mar 9th, 2007 @ 11:05 AM

Hmm - works for me just fine Sven.

I add the instantiated control to an area on the page, for example:

                ASP.controls_matrixcell_ascx matrixCell = new ASP.controls_matrixcell_ascx();

                Panel1.Controls.Add(matrixCell);

great solution odujosh!

Sven Groot
My name has 9 letters. Coincidence? I think not...

In reply to Disco Patrick

#May 13th @ 6:48 AM

This is an old thread, but...

I think odujosh's method works with a Web Application Project, or a precompiled web site. It does not work however work with the VS2005 Web Site model.

I think, anyway, my memory's a bit foggy on this. Smiley

Disco Patrick

In reply to Sven Groot

#May 13th @ 7:39 AM

Actually, I'm using the Web Site model.

EDITED TO ADD:

While you can instantiate your user control from a page's code-behind file using the ASP.controls_controlname_ascx way, you cannot do this from an ordinary c# class, as the ASP namespace is not available there.