Question

How to find out if a page has a certain contentplaceholder from within master page codebehind?

Asked by: brunobear

Hi, I'm trying to find out, from my master page code behind, if a page includes a certain content placeholder.

If the page includes the content placeholder I need to add a class in my master page and show a panel.

I've tried looping through Page.Controls but it doesn't seem to be giving me what i want. 

foreach (System.Web.UI.Control ctrl in Page.Controls)
		{
			if (ctrl.ID == "focusAreaPlaceHolder")
			{
				controlsinfo.Text = "found it";
				return;
			}
		}

                                  
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Asked On
2009-07-15 at 10:32:15ID24573063
Tags

c#

,

.net

,

asp.net

Topics

C# Programming Language

,

Programming for ASP.NET

Participating Experts
2
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Comments
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Answers

 

by: ki_kiPosted on 2009-07-15 at 10:38:39ID: 24861879

is there a Page.Findcontrol("focusAreaPlaceHolder")   ??

 

by: brunobearPosted on 2009-07-15 at 10:42:59ID: 24861942

That throws an error.
Object reference not set to an instance of an object.

 

by: jinalPosted on 2009-07-15 at 11:13:43ID: 24862324

Try

Master.Findcontrol("focusAreaPlaceHolder")

or

Page.Master.Findcontrol("focusAreaPlaceHolder")

 

by: jinalPosted on 2009-07-15 at 11:16:46ID: 24862364

b'coz Page does not contain content place holder. When you apply master page to content page it adds

<asp:Content ID="content1" ContentPlaceHolderID="focusAreaPlaceHolder" runat="server">
</asp:Content>

so you use like this may be

foreach (System.Web.UI.Control ctrl in Page.Controls)
               {
                       Content c = ctrl as Content;
                       if( c != null)
                       {
                       if (c.ContentPlaceHolderID == "focusAreaPlaceHolder")
                       {
                               controlsinfo.Text = "found it";
                               return;
                       }
                   }
               }

 

by: brunobearPosted on 2009-07-15 at 11:35:57ID: 24862570

@jinal,

that last block of code doesn't print out anything in my label. not sure if it's getting into the if statement or not, didn't debug.



@all,

I started thinking of it a bit differently...i realize the contentplaceholder was always in the controls collection on the master page, so I wondered if maybe I could just figure out if it was empty or not. I found this article which helped:
http://programcsharp.com/blog/archive/2009/01/22/test-if-masterpage-contentplaceholder-has-content-or-is-empty.aspx

That returns true or false depending on whether the page itself has the <asp:content> tag on it for the particular placeholder.

I realize now my original question wording was a bit misleading. I wasn't looking for the placeholder itself, I was looking for the <asp:content> tag that was associated with a certain placeholder.

20120131-EE-VQP-002

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