Comments on: SharePoint Programmatically: Provisioning Lookup Fields

By: Waldek Mastykarz

Waldek Mastykarz — Wed, 01 Feb 2012 07:16:27 +0000

@Duncan: You might try to modify the Lookup Field to use the FileRef field instead of Title, although I'm not sure if it's possible.

By: Duncan

Duncan — Tue, 31 Jan 2012 11:20:03 +0000

Fantastic Post. I was wondering if you had any information on how to change the link behaviour of a multi lookup field in a dispform.aspx to open document directly. Need to apply change to custom list definition tamplate. Cheers Duncan

By: Sunil Dubey

Sunil Dubey — Wed, 21 Dec 2011 10:36:36 +0000

Check out this helpful link too its also having a wonderful explanation on list definition in sharepoint 2010…
http://mindstick.com/Articles/db52b9c2-9775-4899-a1f3-4f85fce9ec32/?List%20Definition%20in%20SharePoint%202010

Thanks

By: Joshua Davis

Joshua Davis — Fri, 22 Apr 2011 18:58:35 +0000

Hey it does work. But, there's a catch – dependencies. (Darn those little critters.)

If you have a List 1 that has a lookup field pulling from List 2. List 2 must be declared and deployed first in your Features.xml so that the GUID is created successfully and assigned to the lookup field in List 1.

I was having a terrible time with this until I realized that list def's are, by default, deployed in alphabetical order. Thus, the above scenario would fail if I didn't declare List 2 prior to List 1 in the Features.xml.

For my real-life case, check out the fist comment on the comments page 3: http://blogs.msdn.com/b/joshuag/archive/2008/03/14/add-sharepoint-lookup-column-declaratively-through-caml-xml.aspx?PageIndex=3#comments

By: Waldek Mastykarz

Waldek Mastykarz — Wed, 10 Nov 2010 10:15:24 +0000

@Shafaqat: Using Content Types is a good practice in general. It makes it easier to aggregate data, use Workflows, Event Handlers, etc.

By: Shafaqat

Shafaqat — Wed, 10 Nov 2010 05:47:32 +0000

thanx for your valuable reply.
at the moment i am using is directly with my list but wondering what role content type can play here? Is it just a Good Practice or something else?

By: Waldek Mastykarz

Waldek Mastykarz — Tue, 09 Nov 2010 15:29:10 +0000

@Shafaqat: No you don't have to add it to a Content Type. You could as well use it directly in a list.

By: Shafaqat

Shafaqat — Tue, 09 Nov 2010 10:35:18 +0000

hi
I have created the lookup filed but y do we need to add in the content type?

By: Sam

Sam — Tue, 09 Nov 2010 00:53:09 +0000

@Waldek, I'm not sure about cross-web lookups in 2007, but you can definitely do this in SP2010 – I've faced the issues you describe, and have created an extension method based around SPWeb.Fields.AddFieldAsXml(), where I store the element XML as an embedded resource and pass it to my method on FeatureActivated. It works fine:

– Create a list in the root site,
– Create a site lookup column in the root site that points to that list,
– Create a content type in the root site using that site column,
– Now create a list in a subsite from that content type.

By: Waldek Mastykarz

Waldek Mastykarz — Tue, 12 Oct 2010 05:14:39 +0000

@Raghu: by default you can use Lookup Fields only with Lists from the same Web as where the Field is being defined.