Yes, we can. But instead of using WblockCloneObjects which may cause eWrongDatabase error, we can use Clone() method of entities from Xref database. This is a different way to copy entities between AutoCAD databases. The following code is an example to copy all entities (except BlockReference) from xrefs to the host drawing:
[CommandMethod("CopyEntitiesFromXrefs")]
public static void CopyEntitiesFromXrefs()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
try
{
var list = new List<Entity>();
var bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);
var modelSpace = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
XrefGraph xrefGraph = db.GetHostDwgXrefGraph(true);
int xrefCount = xrefGraph.NumNodes;
for (int i = 0; i < xrefCount; i++)
{
XrefGraphNode xrefNode = xrefGraph.GetXrefNode(i);
Database xrefDb = xrefNode.Database;
using (var xrefBt = (BlockTable)trans.GetObject(xrefDb.BlockTableId, OpenMode.ForRead, false))
{
using (var xrefModelSpace = (BlockTableRecord)trans.GetObject(xrefBt[BlockTableRecord.ModelSpace], OpenMode.ForRead, false))
{
foreach (ObjectId id in xrefModelSpace)
{
DBObject obj = trans.GetObject(id, OpenMode.ForRead);
Entity clonedEntity = (Entity)obj.Clone();
list.Add(clonedEntity);
}
}
}
}
if (list.Count > 0)
{
foreach (Entity entity in list)
{
modelSpace.AppendEntity(entity);
trans.AddNewlyCreatedDBObject(entity, true);
}
}
modelSpace.DowngradeOpen();
modelSpace.Dispose();
bt.Dispose();
trans.Commit();
}
catch (System.Exception ex)
{
}
}
}
This code does not copy BlockReference as it requires BlockTableRecord to import from source to destination database. In-memory xref database is much faster than db.ReadDwgFile() as all external databases were loaded inside AutoCAD memory.
You can extend the code with predicate delegate to filter out entities of specified properties (layer, entity type…).
