StructureGroup Details using the Content Delivery/Broker API

Question

I am trying to get all the structure groups published in a given publication using the PublicationID. I am expecting to get the structure groups with StructureGroupCriteria by passing the Root Structure Group TCM ID but getting page ids (I am expecting SGs).

Now I am trying to loop through the list and get details of each structuregroup. I did not find any API (.net) to get these details and also the API is returning only Pages.

What I have done and working so far using StructureGroupCriteria, returns list of Page IDs instead of SG IDs

  PublicationCriteria pubCriteria = new PublicationCriteria(pubID);
  // Root StructureGroup TCM ID -- tcm:45-3-4
  StructureGroupCriteria sgCriteria = new StructureGroupCriteria("tcm:45-3-4", true); 
  Criteria allSGsInPub = CriteriaFactory.And(pubCriteria, sgCriteria);
  Query allSGs = new Query(allSGsInPub);
  string[] sgInfo = allSGs.ExecuteQuery();
  Response.Write("Total : " + sgInfo.Length);
  foreach (string sgid in sgInfo ) {
    // HOW DO I get the Structure Group Details here
     //TCMURI sgURI = new TCMURI(sgid);
  }

Q # 1 : How to get the all the structuregroups and individual structure group details? (May be something simple, I am not able to find right API).

Q # 2 : How can I get all the structuregroups using ItemTypeCriteria sgCriteria = new ItemTypeCriteria(4); // 4 is SG Item Type .

When I tried this option, the query worked successfully but no results returned. Is this the expected behavior and should we always use StructureGroupCriteria instead of ItemTypeCriteria?

The reason for this approach, I want to avoid using the Root StructureGroup ID which is required with the above code. But at the moment, none of the approaches returning StructureGroup information and I always get Page Information.

Tridion Version: 2011 SP1, .net API.

Note: When I publish I am checking the publish SG info checkbox and published successfully. On Broker DB side, I can see the information on the taxnonomy table as well.

Answer 1

I was playing with Odata service and accidentally I found that I can get all my structure group information from Odata web service.

/cd_webservice/odata.svc/StructureGroups?$filter=PublicationId%20eq%2045

Also, the results are returning child structure groups with a depth parameter.

Just to clarify , using Broker API it is not feasible to get the structure groups (my original question). However, the workaround solution is to use OData Service to get the Structure Groups.