Search and erase proxies

By Augusto Goncalves

This post is quite similar to this another one, Remove all proxy entities from a drawing using ObjectARX. Both start at the same principle: search for object that are proxy. This .NET version goes a little deeper and try find dictionaries that hold proxy objects. Note that some objects cannot be erased, so we perform a trick: hand over to another entity. For others, we just try erase and see what happens.

The main idea is to perform a clean up and avoid the proxy message. Please be advised that this will erase objects and entities, so it may not be safe. Use carefully.

Suggestions to improve this? Feel free to comment.

[CommandMethod("searchAndEraseProxy")]    public static void searchAndEraseProxy()    {      _NODEntriesForErase = new ObjectIdCollection();      Database db = Application.DocumentManager.        MdiActiveDocument.Database;      using (Transaction trans = db.TransactionManager.        StartTransaction())      {        // open block table        BlockTable bt = trans.GetObject(db.BlockTableId,           OpenMode.ForRead) as BlockTable;        // for each block table record        // (mspace, pspace, other blocks)        foreach (ObjectId btrId in bt)        {          BlockTableRecord btr = trans.GetObject(btrId,            OpenMode.ForRead) as BlockTableRecord;          // for each entity on this block table record           foreach (ObjectId entId in btr)          {            Entity ent = trans.GetObject(entId,              OpenMode.ForRead) as Entity;            if ((ent.IsAProxy))            {              ent.UpgradeOpen();              ent.Erase();              Application.DocumentManager.                MdiActiveDocument.Editor.WriteMessage(                  string.Format(                  "nProxy entity found: {0}",                  ent.GetType().Name));            }          }        }             // now search for NOD proxy entries        DBDictionary nod = trans.GetObject(          db.NamedObjectsDictionaryId,           OpenMode.ForRead) as DBDictionary;        searchSubDictionary(trans, nod);        trans.Commit();      }           // the HandOverTo operation must       // be perfomed outside transactions      foreach (ObjectId nodID in _NODEntriesForErase)      {        //replace with an empty Dic Entry        DBDictionary newNODEntry = new DBDictionary();        DBObject NODEntry = nodID.Open(OpenMode.ForWrite);        try        {          NODEntry.HandOverTo(newNODEntry, true, true);        }        catch (Autodesk.AutoCAD.Runtime.Exception ex) { }             // if we cannot close the OLD entry,        // then is not database resident        try { NODEntry.Close(); }        catch { Application.DocumentManager.          MdiActiveDocument.Editor.          WriteMessage("nErased"); }             //close the new one        try { newNODEntry.Close(); }        catch { }      }    }         private static ObjectIdCollection       _NODEntriesForErase;         private static void searchSubDictionary(      Transaction trans, DBDictionary dic)    {      foreach (DBDictionaryEntry dicEntry in dic)      {        DBObject subDicObj = trans.GetObject(          dicEntry.Value, OpenMode.ForRead);        if (subDicObj.IsAProxy)        {          Application.DocumentManager.            MdiActiveDocument.Editor.WriteMessage(              string.Format(              "nProxy found at key {0}",               dicEntry.Key));          subDicObj.UpgradeOpen();               // for several Proxy Entities the          // Erase is not allowed withyou the          // Object Enabler throw an exception,          // just treat          try { subDicObj.Erase(); continue; }          catch          {            Application.DocumentManager.              MdiActiveDocument.Editor.              WriteMessage(" | Erase not allowed");            //try again latter            _NODEntriesForErase.Add(subDicObj.ObjectId);          }        }        else        {          //if this key is not proxy, let go into sub keys          DBDictionary subDic =             subDicObj as DBDictionary;          if (subDic != null)             searchSubDictionary(trans, subDic);        }      }    }