Enumerating all the web parts on a page - from a web part
I have a web part that needs to examine every other web part on a given page for info. I've tried two approaches, but neither seems to be the answer I'm looking for.
First, I tried getting a reference to Parent (which returns the WebPartManager) and enumerating through it's Controls (or WebParts) collection. This almost works - it gives me every web part in the same WebPartZone as my web part. But it doesn't give me all the web parts in the other zones. Example:
WebPartManager wpm = (WebPartManager)this.Parent;
foreach (WebPart wp in wpm.WebParts)
{
Debug.WriteLine("I found " + wp.Title);
}After some thinking I decided to try and enumerate through the Zones as well, but that yielded the same results. It only gives me the Zone I'm in for some reason. I don't understand why.
WebPartManager wpm = (WebPartManager)Parent;
foreach (WebPartZone wpz in wpm.Zones)
{
Debug.WriteLine("In Zone " + wpz.ID);
foreach (WebPart wp in wpz.WebParts)
{
Debug.WriteLine("I found " + wp.Title);
}
}My second thought was to simply grab all the controls on the Page, and loop through them looking for web parts. There are two problems with this. First, we use a Site.Master as well as web parts, so the only control in the Page.Controls collection is Site.Master. Second, I want my web part to function in any given web page, so I don't want to hard-code something to work around my particular layout. So enumerating the Page controls is out.
Can anyone clue me in as to how I can enumerate all Web Parts in all zones - from a web part?
-Todd Davis
http://www.SeaburyDesign.com
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toddhd
8/30/2006 7:20:59 PM
asp.net.personalization
3779 articles. 
0 followers.
5 Replies
1046 Views
You can get a reference to the collection of webparts on the page be accessing WebParts property of the WebPartManager:
WebPartCollection parts = WebPartManager1.WebParts;
David Barkol | ASP.NET AJAX in Action
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davidbarkol
8/30/2006 10:08:07 PM
But look at the first line of both my examples - that's exactly what I'm doing.
The thing is, this works fine if I access the WebPartManager from the Page's code-behind. It returns all the web parts.
But I need to reference the WebPartManager from the Webpart. When you access the Parent of a web part, it returns a reference to the WebPartManager it resides in. But for some reason, the WPM only seems to recognize the zone from the calling web part. Try it, you'll see. Something like this:
public MyClass : WebPart
{
public void SomeFunction()
{
WebPartManager wpm = (WebPartManager)this.Parent;
foreach (WebPart wp in wpm.WebParts)
{
Debug.WriteLine("I found " + wp.Title);
}}
}
-Todd Davis
http://www.SeaburyDesign.com
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toddhd
8/31/2006 12:01:59 AM
Never mind, I just setup a small test project outside of my main project, and the code posted above works just fine in the test. My main project uses MS Atlas, and I wonder if maybe that has something to do with what I'm seeing? Anyway, it works fine in my test project, so I'll have to look for what's different now.
-Todd Davis
http://www.SeaburyDesign.com
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toddhd
8/31/2006 1:03:10 AM
Oops, sorry about that. I should have read your post more carefully. Try this:
WebPartManager wpm = WebPartManager.GetCurrentWebPartManager(this.Page); foreach (WebPart wp in wpm.WebParts) { System.Diagnostics.Debug.WriteLine("Found {0}", wp.Title); }
David Barkol | ASP.NET AJAX in Action
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davidbarkol
8/31/2006 1:09:34 AM
Thanks - I've never seen the GetCurrentWebPartManager call before - I was really hoping that would do it, but the results were the same. I removed the Atlas Update Panel as well, and was hoping that might be the problem (Atlas does all kinds of funny things to web parts) but that didn't help either. I'm so confused. Clearly the syntax is correct, so I'm not sure why the results are being limited to a single zone. We have two zones on the page, with the ability to add more dynamically, but those initial two are "hard coded" into the HTML, so they should show up.
-Todd Davis
http://www.SeaburyDesign.com
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toddhd
8/31/2006 1:33:06 AM
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