// Erase the anonymous blocks referenced by an object
private static void EraseReferencedAnonBlocks(
Transaction tr, DBObject obj
)
{
var refFiler = new ReferenceFiler();
obj.DwgOut(refFiler);
// Loop through the references and erase any
// anonymous block definitions
//
foreach (ObjectId refid in refFiler.HardPointerIds)
{
BlockTableRecord btr =
tr.GetObject(refid, OpenMode.ForRead) as BlockTableRecord;
if (btr != null && btr.IsAnonymous)
{
btr.UpgradeOpen();
btr.Erase();
}
}
}
// Remove the stroke objects that have references from this
// particular complex linetype or stroke object from the list
// passed in
private static void PurgeStrokesReferencedByObject(
Transaction tr, ObjectIdCollection nodIds, ObjectId id
)
{
var obj = tr.GetObject(id, OpenMode.ForRead);
if (obj.ExtensionDictionary != ObjectId.Null)
{
// Get the extension dictionary
var exd =
(DBDictionary)tr.GetObject(
obj.ExtensionDictionary, OpenMode.ForRead
);
// And the "DGN Linestyle Definition" object
if (exd.Contains(dgnLsDefName))
{
var lsdef =
tr.GetObject(
exd.GetAt(dgnLsDefName), OpenMode.ForRead
);
// Use a DWG filer to extract the references
var refFiler = new ReferenceFiler();
lsdef.DwgOut(refFiler);
// Loop through the references and remove any from the
// list passed in
foreach (ObjectId refid in refFiler.HardPointerIds)
{
if (nodIds.Contains(refid))
{
nodIds.Remove(refid);
}
// We need to recurse, as linetype strokes can reference
// other linetype strokes
PurgeStrokesReferencedByObject(tr, nodIds, refid);
}
}
}
else if (
obj.GetRXClass().Name.Equals("AcDbLSCompoundComponent") ||
obj.GetRXClass().Name.Equals("AcDbLSPointComponent")
)
{
// We also need to consider compound components, which
// don't use objects in their extension dictionaries to
// manage references to strokes...
// Use a DWG filer to extract the references from the
// object itself
var refFiler = new ReferenceFiler();
obj.DwgOut(refFiler);
// Loop through the references and remove any from the
// list passed in
foreach (ObjectId refid in refFiler.HardPointerIds)
{
if (nodIds.Contains(refid))
{
nodIds.Remove(refid);
}
// We need to recurse, as linetype strokes can reference
// other linetype strokes
PurgeStrokesReferencedByObject(tr, nodIds, refid);
}
}
}
