Panel Controls inside a custom server control in ASP.NET

  • Thread starter Thread starter Charles Zhang
  • Start date Start date
C

Charles Zhang

I want to create a simple server control that does thing like:

<Mc:CollapsibleControl TitlePanelID="panel1" BodyPanelID="Panel2">
<asp:Panel ID="panel1">
...
</asp:Panel>

<asp:Panel ID="panel2">
...
</asp:Pane2>
</Mc:CollaspableControl>

I based my custom web server control on the example you can find on:
http://msdn2.microsoft.com/en-us/library/ms178654.aspx

I defined a "Panels" property that return an array of "Panel" class.

What should I change to make it work? Thanks

Charles Zhang
 
Hi Charles,

You need to apply ParseChildrenAttribute(false) on your custom control to
let the default ControlBuilder to interpret the content within your
control's begin and end tags. The parsed objects are added to your control
via the AddParsedSubObject method of your control. By default, the
AddParsedSubObject method expect server controls and adds these parsed
controls into your control's Controls collection as child controls.

Since you're only wanting Panel controls added to your controls collection,
you can do this by:

[ParseChildren(false)]
public class C1 : WebControl
{
private List<Panel> m_panels = new List<Panel>();

protected override void AddParsedSubObject(object obj)
{
if (obj is Panel)
{
Panel p = (Panel)obj;
m_panels.Add(p);
Controls.Add(p);
}
}

public List<Panel> Panels
{
get { return m_panels; }
}
}

Sincerely,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

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I got the problem resolved. The code I wrote is working. However, the
web page does not use the new assembly until I restarted the web site.
To avoid the problem during debugging, I moved the custom user control
to "App_Code".
 
Hi Charles,

Thanks for the update.

Is your web application migrated from ASP.NET 1.1? Or, are you using the
Web Application Project add-on for VS2005?

As for VS2005, it's recommened to put classes in the App_Code folder.

Regards,
Walter Wang ([email protected], remove 'online.')
Microsoft Online Community Support

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