DynamicPlaceholder

Published 15 September 04 06:20 PM | despos

Just want to give more visibility to a comment that Scott added to my previous post about dynamic controls. Basically, Scott pointed me to a Denis Bauer's custom control that acts as a placeholder for dynamically added controls. You can learn more here. Nice, really nice idea. It does more or less what I suggested to do but hiding all the nitty-gritty details.

Great job, Denis!

Comments

# Mr Jonathan Roberts said on September 15, 2004 05:10 PM:

It is great component, particularly for user controls added to grid templates. However if you have delegate events you add you have to re add them in a custom event of the control. By that time it seems easier to user a plain old place holder, and add the additional events when you add the user control. So I use it rather less now.

# Scott Galloway said on September 16, 2004 09:50 AM:

Jonathan, there is a way round that, what I tend to do is dynamically re-hook the controls events after the reload - so in my BasePage I have a handler in thr OnInit like so:

RestorePlaceholderEvents(Page.Controls);

This calls this:


private void RestorePlaceholderEvents(ControlCollection controlColl)
{
foreach(Control ctrl in controlColl)
{
DynamicControlsPlaceholder dcp = ctrl as DynamicControlsPlaceholder;
if(dcp!=null)
dcp.ControlRestored += new DynamicControlEventHandler(PlaceHolder_ControlRestored);

if(ctrl.HasControls())
RestorePlaceholderEvents(ctrl.Controls);
}

}

Which hooks up to this event:

private void PlaceHolder_ControlRestored(object sender, DynamicControlEventArgs e)
{
BaseUserControl uc1 = e.DynamicControl as BaseUserControl;
uc1.RestoreControlEventHandler(sender,e);
}


Allowing this to fire in the BaseUserControl object :
public event DynamicControlEventHandler RestoreControlEvent;
public void RestoreControlEventHandler(object sender, DynamicControlEventArgs e)
{
if(this.RestoreControlEvent != null)
this.RestoreControlEvent(sender, e);
}

This way I can be sure that all of my events are re-hooked up without having to do anything special in my UserControls. This is all aimed at being able to use Dynamically added controls with no extra plumbing in each control

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