Dynamically load User Controls into a Web Control without Register Tags

Question

I'm working with a container which accepts a collection of server controls. The server control accepts a collection of user controls.

<Container>
  <Servercontrol>
    <UsercontrolA/>
    <UsercontrolB/>
    <UsercontrolC/>
    <UsercontrolD/>
  </Servercontrol>
  <Servercontrol>
    <UsercontrolE/>
  </Servercontrol>
</Container>

This will essential render out to be two columns in a table, with a header row, and a body row. The body row of the left column will have 4 user controls, the right will have 1.

The problem is that I want the programmers to be able to add any user control into this container.... but the user controls aren't rendered unless they have added the appropriate register tags.

<%@ Register TagPrefix="C" TagName="A" Src="~/Controls/UsercontrolA.ascx" %>
<%@ Register TagPrefix="C" TagName="B" Src="~/Controls/UsercontrolB.ascx" %>
<%@ Register TagPrefix="C" TagName="C" Src="~/Controls/UsercontrolC.ascx" %>
<%@ Register TagPrefix="C" TagName="D" Src="~/Controls/UsercontrolD.ascx" %>
<%@ Register TagPrefix="C" TagName="E" Src="~/Controls/UsercontrolE.ascx" %>

Also I'm not authorized to modify the web config.

Is there any workaround for this?

what do you mean you are not able to modify the web.config file? so what if you need to make modifications to the existing web application that you are supporting.. are you not allowed to add entry's into the web.config..? — MethodMan
– MethodMan, Commented Aug 20, 2013 at 13:55
@DJKRAZE The web.config is controlled by our architects, they really don't like us changing it. — Jack
– Jack, Commented Aug 20, 2013 at 14:03

Kimtho6 · Accepted Answer · 2013-08-20 20:54:04Z

2

Well you can load them dynamic on page load like this:

private const string UCFolderName = "~/Controls/";
...    
var usercontrolA= Page.LoadControl(UCFolderName + "UsercontrolA.ascx");

ServercontrolContainer.Controls.Add(UsercontrolA);

where ServercontrolContainer is a element in your .ascx file

edited Aug 20, 2013 at 20:54

answered Aug 20, 2013 at 13:57

Kimtho6

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2 Comments

Jack Over a year ago

This does the trick, is there any way of doing this without knowing the directory to the web control? e.g. passing in the type?

Kimtho6 Over a year ago

No Unfortunately not, but you can use a prefix to make it "pretty" that is what i would do

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