Get All ApplicationData with Given ID

Did you know that in Tridion 2011SP1 it is now possible to retrieve all items that have a particular Application Data ID associated? This method basically allows you to search for a given Application Data ID and it returns the TCMURIs of all items that have that AppData ID associated.

This topic would have been very useful when I developed the AppDataInspector Powertool. At that time, in Tridion 2011GA, this functionality was not available. I would have liked to be able to search for a given Application Data ID. Instead, the tool only reads AppData on the 'current' item. [Note to self: add "search by id" functionality to AppDataInspector]

Core Service
You can use Core Service method: ICoreService2011.GetSubjectIdsWithApplicationData

Gets a list of TcmUri of subjects which have application data of the specified applicationId associated.

Namespace: Tridion.ContentManager.CoreService

The sample below is taken from my Core Service Client blog post:

public string GetSubjects(string appDataId)

{

    var result = "";

    foreach (var uri in _client.GetSubjectIdsWithApplicationData(appDataId))

    {

        result += uri + ", ";

    }

    return result;

}

TOM.NET
You can use the following method: SystemManager.GetSubjectIdsWithApplicationData(string id)

Gets a list of TcmUri of subjects which have application data of the specified applicationId associated.

Namespace: Tridion.ContentManager

var result = "";

var systemManager = session.SystemManager;

foreach (var uri in systemManager.GetSubjectIdsWithApplicationData("ugc:ComponentAndPage"))

{

    result += uri + "; ";

}