Delete un used registered application names from database

By Virupaksha Aithal

Database.Purge API can be used to identify the un-used registered applications. Once un used registered application names are identified, use “erase” API to remove the registered application names from the drawing file.

[CommandMethod("PurgeApplicationName")]
public static void PurgeApplicationName()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = doc.Editor;
 
    using (Transaction Tx =
           db.TransactionManager.StartTransaction())
    {
        RegAppTable table = Tx.GetObject(db.RegAppTableId,
            OpenMode.ForRead) as RegAppTable;
 
        ObjectIdCollection regIds = new ObjectIdCollection();
        foreach (ObjectId id in table)
        {
            regIds.Add(id);
        }
 
        //this function will remove all
        //app names which are used in the drawing file
        db.Purge(regIds);
 
        foreach (ObjectId id in regIds)
        {
            DBObject obj = Tx.GetObject(id, OpenMode.ForWrite);
            obj.Erase();
        }
        Tx.Commit();
    }
}