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Loading user controls programatically into a placeholder (asp.net)

Answer 1

+1 A:

I don't know VB too well, but don't you need to declare the control to be a UserControl and not just Control? e.g. Try changing

Dim loadmodule As Control

To

Dim loadmodule As UserControl

Dan Diplo 2010-04-15 10:04:11

Thanks Dan. Unfortunately after changing to UserControl it did'nt seem to make a difference.

Phil 2010-04-15 10:10:25

Answer 2

+1 A:

Rather than declaring your UserControl as type "Control", declare it as the Class Name you specified in your UserControl.ascx file:

<%@ Control className="MyUserControl" %>

So in your code-behind on the .aspx page:

Dim objControl as ASP.MyUserControl = CType(LoadControl("~\Controls\MyUserControl.ascx"), ASP.MyUserControl)

More info available on MSDN.

EDIT: Check the code-behind file for your user control and take note of the namespace and class name that are in there. When I created my user control, it was automatically added to a namespace which contained the folder name as well as the application namespace.

Then, in your .aspx.vb, replace "ASP.ContentModule" with "Namespace.ClassName" from your .ascx.vb file. Also, make sure you're still calling the Add method on your placeholder.

My example's in C# but I can put up in vb if you need. My application was conveniently named "Tester".

ASCX code-behind:

namespace Tester.modules
{
    public partial class content : System.Web.UI.UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
    }
}

ASPX code-behind:

namespace Tester
{
    public partial class _Default : System.Web.UI.Page
    {   
        private Namespace.ClassName loadmodule;
        protected void Page_Load(object sender, EventArgs e)
        {
            loadmodule = (Namespace.ClassName)LoadControl("~/modules/content.ascx");
            Modulecontainer.Controls.Add(loadmodule);
        }
    }
}

fat_tony 2010-04-15 10:05:57

Thanks, I've moved the loadmodule declaration outside the page_load and changed to <%@ Reference Control="~/modules/content.ascx" %> and have added ClassName="ContentModule" to the user control but still no results unfortunately.

Phil 2010-04-15 10:56:41

Just out of curiosity, does the user control work properly if you declare it on the page normally? I.e. <ucl:Content id="uclContent" runat="server" />. Don't forget to change back to @Register for this.

fat_tony 2010-04-15 11:07:11

yep i can put it in manually no probs.

Phil 2010-04-15 11:09:41

I think the problem may be more complex. I now have the usercontrol being loaded but still no content within. Your solution worked though.

Phil 2010-04-15 11:18:30

Okay, I've knocked up a quick app that does the same and it seems to work. I've edited my post above to include what I've done.

fat_tony 2010-04-15 11:28:27

Sounds like the problem's now more to do with the load event on the user control. Easy to test by adding a static <p> tag to the control, see if it's rendered on the aspx page.

fat_tony 2010-04-15 11:37:52

It is rendered ok. And I have a page_load in both the aspx and the ascx.vb... i think this is the problem

Phil 2010-04-15 13:16:20

Why don't you try creating a public method in your ascx.vb and call that from the Page_Load event in the aspx.vb?

fat_tony 2010-04-15 14:12:26

That worked, thanks!

Phil 2010-04-16 07:39:52

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Loading user controls programatically into a placeholder (asp.net)

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