Adding/removing UpdatePanels dynamicaly from a page

re: Adding/removing UpdatePanels dynamicaly from a page

Thanks! — Thu, 23 Apr 2009 17:58:27 GMT

Thank Phillipe, it works like magic

And thanks Gary for the VB transalation.

re: Adding/removing UpdatePanels dynamicaly from a page

marcel — Thu, 12 Mar 2009 12:03:10 GMT

Phillipe, i am getting errors: can't find methodinfo and BindingFlags

does it need a using directive or something?

re: Adding/removing UpdatePanels dynamicaly from a page

Gary — Wed, 10 Dec 2008 22:34:13 GMT

Thanks Philippe for the solution.

I had struggled with the same problem. I was able to convert your solution to VB and I have provided it below for anyone who is also struggling with this.

Public Sub RegisterUpdatePanel(ByVal sender As System.Object, ByVal e As System.EventArgs)

Dim panel As UpdatePanel = Me.UpdatePanel1

'Dim aMethodInfo As System.Reflection.MethodInfo

For Each aMethodInfo As System.Reflection.MethodInfo In GetType(ScriptManager).GetMethods(System.Reflection.BindingFlags.NonPublic Or Reflection.BindingFlags.Instance)

If aMethodInfo.Name.Equals("System.Web.UI.IScriptManagerInternal.RegisterUpdatePanel") Then

aMethodInfo.Invoke(ScriptManager.GetCurrent(Page), New Object() {panel})

End If

End Sub

‘ You can then call this method with something like this from the Page_Int.

AddHandler Me.UpdatePanel1.Unload, AddressOf RegisterUpdatePanel

I hope this helps.

re: Adding/removing UpdatePanels dynamicaly from a page

Vlady — Thu, 13 Nov 2008 21:51:16 GMT

Please write the code in visual Basic a with real case

re: Adding/removing UpdatePanels dynamicaly from a page

Paul — Tue, 23 Sep 2008 12:23:26 GMT

Philippe - that's a real nasty hack!! But it works and I love it - thanks!

re: Adding/removing UpdatePanels dynamicaly from a page

rüya tabiri — Sat, 06 Sep 2008 04:48:34 GMT

Thanks very much !!

re: Adding/removing UpdatePanels dynamicaly from a page

Philippe — Thu, 04 Sep 2008 21:13:33 GMT

Thought I'd share this solution with you...

The problem is that when the UpdatePanel unloads, it is also unregisters itselfs. That being a fact, the solution is to register it again.

Unfortunately, the method to register an UpdatePanel is private so reflection is the key to invoke said method.

public void RegisterUpdatePanel(

UpdatePanel panel)

{

MethodInfo m =

(from methods in typeof(ScriptManager).GetMethods(BindingFlags.NonPublic | BindingFlags.Instance)

where methods.Name.Equals("System.Web.UI.IScriptManagerInternal.RegisterUpdatePanel")

select methods).First<MethodInfo>();

m.Invoke(ScriptManager.GetCurrent(Page), new object[] { panel });

}

When the UpdatePanel is created, simply hook an handler on it's Unload event and call the RegisterUpdatePanel method.

Unfortunately, I cannot guarantee this will work in future Framework build but at the same time, they might just have fixed the issue.

Hope this helps...

re: Adding/removing UpdatePanels dynamicaly from a page

Tommy — Thu, 28 Aug 2008 18:16:12 GMT

Well, I'll go ahead and add this. The problem is removing the Update Panel and then adding it back again. The solution is to not have the Update panel there in the first place, just load it dynamically. Here's how I got the error, and then what I did to fix it.

--I have a Panel with an Update Panel inside of it on my page.

--I wrote a User Control to extend this panel with some extra functionality.

--The user control basically wraps the panel , so I have :

<some controls>...

--I wrote the Panel up in Visual Studio on the page, and set that Panel to be the Target of my Extender user control, which placed it in the PlaceHolder.

So here's what happens: Page_PreInit runs, puts the Panel with the UpdatePanel on the main page.

Page_Load runs, Removing the Panel from the Page Hierarchy, and then placing it in the UserControl hierarchy (this is where it breaks)...

So here's what I did. Instead of designing the Panel on the Page, I create a second user control with the same markup as the Panel. Then, instead of PlaceHolder.Controls.Add(Panel), I do PlaceHolder.Controls.Add(LoadControl("myControl.ascx"))

As for code behind on the was-panel-now-userControl, you can either put it in the UserControl, or you can simply pass through the relevant events to the page by registering your own events for the new UserControl.

No, it's not the simplest solution, but it'll work.

re: Adding/removing UpdatePanels dynamicaly from a page

Kalam — Sat, 03 May 2008 18:02:00 GMT

I have migrated to .Net 2.0. There are some custom controls on the page including form and panel. This controls are mandatory for the page and form. Now while I want to implement ad ajax withih the page I get this error. How to deal with ajax and custom control in VS 2005. Any suggestion will be appriciated.

Please help

Thanks

re: Adding/removing UpdatePanels dynamicaly from a page

Kominsky — Wed, 16 Apr 2008 18:13:55 GMT

Well, as som have said, there's a lot of complaining about this issue, but I can't see solutions, plx! if someone has a solution, post it here, I really need it, and well, I'm still lookin' for it, so if I get it, I'll post it here for sure.

My problem is:

aspx-contains the follow:

scriptManager1

updatePanel1

ascx1{updatePanel2[ascx2]}

when I try to update updatePanel2, I got that error...

By the way, my ascx 1 and ascx2 are loaded in the Page_Load cuz they are dynamic too...

PLX! HELP!

Printing Multiple Tabs on one screen and UpdatePanel issue

ASP.NET AJAX Forum Posts — Thu, 10 Apr 2008 21:52:03 GMT

OK. I've been working on this for 2 days, and scouring the forums for answers. I hve found many and

re: Adding/removing UpdatePanels dynamicaly from a page

Luis Abreu — Mon, 07 Apr 2008 08:19:08 GMT

Hello.

yeah, the web forms model has some gotchas....

but do notice that you can still add the UpdatePanel during the load event. what you cannot do is add/remove/add again after the event i've mentioned...the problem I'm describing happens because there are some cases where a control (which internally contains an UpdatePanel) is initially added to an existing control, then removed and then added again to another controls's collection. if you do this, then be sure to do it until the preinit event.

If you're just adding a control to the page (and you're nov removing it/adding it to another place later) you should be able to do it until the end of the load event...

re: Adding/removing UpdatePanels dynamicaly from a page

Serializer — Sun, 06 Apr 2008 23:49:18 GMT

Yet another example of how broken ASP.NET is.

Why design this great component model, yet not actually build in the flexibility to use it properly?

It makes building web applications ultimately take about 100x as long, rather than saving time as it's supposed to - since I seem to spend all my time figuring out how to work around ridiculous inflexibilities like this.

I can't use the Page_PreInit event to insert my user control containing the update panel - because Page_PreInit has fired *way* before my other nested controls are ready to set themselves up.

Microsoft recommend that dynamically-added controls should be added in the Load method. This dynamically added control contains a templated control, which in turn instances a further user control within itself - sometimes this control will also contain an UpdatePanel. I simply can't do this at PreInit - the other page controls that I need to insert into aren't available at this time.

Don't know what to do but somehow I will kludge this mess, then wait for MVC toolkit to drop so I can start building things *properly*.

re: Adding/removing UpdatePanels dynamicaly from a page

Goldfinger — Thu, 27 Mar 2008 20:32:37 GMT

FOR GOD.... WRITE THE DAMN SOLUTION

re: Adding/removing UpdatePanels dynamicaly from a page

bakuuu — Mon, 24 Sep 2007 12:20:35 GMT

Great, but I have an another problem.

I have been trying to set programatically visible and unvisible of some Controls in my WebPage. On this Controls there are UpdatePanels.

On each control - one UpdatePanel.

I have to set visible = true/false in "Page_PreInit" method, it works on single test site, but...

In my project I have a MasterPage, and in method Page_PreInit a reference to my control is null, so I can't change visible, and masterpage has no PreInit method.

How to solve it ? Maybe you know some other solution to dynamic hide controls with updatePanel in it.

re: Adding/removing UpdatePanels dynamicaly from a page

Interesting — Thu, 13 Sep 2007 12:01:21 GMT

If you mo-fo's don't know the answer, just say so..!

Some of us would actually appreciate the help.

re: Adding/removing UpdatePanels dynamicaly from a page

Iannis — Sun, 29 Jul 2007 05:31:37 GMT

Interesting...

re: Adding/removing UpdatePanels dynamicaly from a page

Mamadshah — Sat, 28 Jul 2007 11:05:54 GMT

interesting

re: Adding/removing UpdatePanels dynamicaly from a page

Odysseas — Wed, 20 Jun 2007 06:50:53 GMT

interesting

re: Adding/removing UpdatePanels dynamicaly from a page

Kymon — Tue, 19 Jun 2007 11:23:47 GMT

Interesting...