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C3D-0368 · Move all frozen-layer entities to a new frozen layer HIDDEN, delete the emptied layers [C3D-HIDDEN] done

Reads the currently-frozen layers live, moves every entity on them (model space and all layouts) onto a new layer HIDDEN, deletes the now-empty source layers, and freezes HIDDEN so the geometry stays hidden. Entities are preserved, not erased. Verifies HIDDEN is frozen, holds the moved entities, and no source layer remains.

C# payload

// Move every entity on a currently-FROZEN layer to a new layer HIDDEN (created frozen), then
// delete the emptied source layers. Reads the frozen set live. HIDDEN stays frozen so the
// geometry remains hidden; the entities are preserved, not erased.
const string TARGET = "HIDDEN";
Log("drawing: " + Db.Filename);

var lt = (LayerTable)Tx.GetObject(Db.LayerTableId, OpenMode.ForWrite);

// which layers are frozen right now (the sources)
var srcNames = new List<string>();
foreach (ObjectId id in lt) {
    var l = (LayerTableRecord)Tx.GetObject(id, OpenMode.ForRead);
    if (l.IsFrozen && !l.Name.Equals(TARGET, StringComparison.OrdinalIgnoreCase)) srcNames.Add(l.Name);
}
srcNames.Sort(StringComparer.OrdinalIgnoreCase);
Log("frozen source layers: " + srcNames.Count);
foreach (var n in srcNames) Log("   " + n);
if (srcNames.Count == 0) { Log("nothing frozen - nothing to do"); return; }

// create HIDDEN (thawed for now so we can move entities onto it; frozen at the end)
ObjectId targetId;
if (lt.Has(TARGET)) { targetId = lt[TARGET]; Log(TARGET + " already exists"); }
else { var nl = new LayerTableRecord(); nl.Name = TARGET; targetId = lt.Add(nl); Tx.AddNewlyCreatedDBObject(nl, true); Log("created " + TARGET); }
{
    var t = (LayerTableRecord)Tx.GetObject(targetId, OpenMode.ForWrite);
    t.IsFrozen = false; t.IsOff = false; t.IsLocked = false;
}

// thaw/unlock sources so their entities are editable
foreach (var n in srcNames) {
    var l = (LayerTableRecord)Tx.GetObject(lt[n], OpenMode.ForWrite);
    l.IsFrozen = false; l.IsOff = false; l.IsLocked = false;
}

// move entities across every block (model + layouts) so paper-space frozen items come too
var srcSet = new HashSet<string>(srcNames, StringComparer.OrdinalIgnoreCase);
var bt = (BlockTable)Tx.GetObject(Db.BlockTableId, OpenMode.ForRead);
int moved = 0;
foreach (ObjectId btrId in bt) {
    var btr = (BlockTableRecord)Tx.GetObject(btrId, OpenMode.ForRead);
    foreach (ObjectId id in btr) {
        var probe = Tx.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
        if (probe == null) continue;
        if (!srcSet.Contains(probe.Layer)) continue;
        var e = (Autodesk.AutoCAD.DatabaseServices.Entity)Tx.GetObject(id, OpenMode.ForWrite);
        e.Layer = TARGET;
        moved++;
    }
}
Log("moved " + moved + " entities to " + TARGET);

// current layer must not be a delete target
{
    var cl = (LayerTableRecord)Tx.GetObject(Db.Clayer, OpenMode.ForRead);
    if (srcSet.Contains(cl.Name)) { Db.Clayer = lt["0"]; Log("current layer was frozen source - switched to 0"); }
}

// delete emptied source layers
int deleted = 0;
foreach (var n in srcNames) {
    try { var l = (LayerTableRecord)Tx.GetObject(lt[n], OpenMode.ForWrite); l.Erase(); deleted++; }
    catch (System.Exception ex) { Log("could not delete " + n + ": " + ex.Message); }
}
Log("deleted " + deleted + " layers");

// freeze HIDDEN
{
    var t = (LayerTableRecord)Tx.GetObject(targetId, OpenMode.ForWrite);
    t.IsFrozen = true;
}

// verify
var lt2 = (LayerTable)Tx.GetObject(Db.LayerTableId, OpenMode.ForRead);
int leftover = 0;
foreach (var n in srcNames) if (lt2.Has(n)) { leftover++; Log("  STILL PRESENT: " + n); }
var h = (LayerTableRecord)Tx.GetObject(lt2[TARGET], OpenMode.ForRead);
int onHidden = 0;
foreach (ObjectId btrId in bt) {
    var btr = (BlockTableRecord)Tx.GetObject(btrId, OpenMode.ForRead);
    foreach (ObjectId id in btr) {
        var e = Tx.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Entity;
        if (e != null && !e.IsErased && e.Layer.Equals(TARGET, StringComparison.OrdinalIgnoreCase)) onHidden++;
    }
}
Log(string.Format("VERIFY: {0} frozen={1}  entities on {0}={2}  emptied-layers-still-present={3}  {4}",
    TARGET, h.IsFrozen, onHidden, leftover, leftover==0 ? "CLEAN" : "*** NOT CLEAN ***"));
Ed.Regen();

Result

drawing: C:\Users\sanja\OneDrive\_SurveyDisco\260613 - 5030 E Lake Pkwy, Stockbridge, GA 30281, USA\ACAD-260612-Springdale Sanitary Sewer Extension As-Built 60 wPROFILE.dwg
frozen source layers: 23
   FIRE_HYDRANT
   FIRE_HYDRANT_VALVE
   PROJECT_BOUNDARY_TEXT
   PUMP_STATION_TEXT
   SEWER_EASEMENT RED
   SEWER_EASEMENT_20
   SEWER_LINE E1
   SEWER_LINE_TEXT E1
   SEWER_MANHOLE E1
   SEWER_MANHOLE_TEXT E1
   SS-0-FRAME
   SS-BOUNDARY
   SS-ROAD-BUILDING
   SS-ROAD-CANOPY
   SS-ROAD-DUMPSTER
   SS-ROAD-SIDEWALK
   SS-ROAD-STRIPE
   SS-ROAD-TBC
   WATER_LINE
   WATER_LINE_PTS
   WATER_LINE_TEXT
   WATER_VALVE
   WATER_VAULT
created HIDDEN
moved 339 entities to HIDDEN
deleted 23 layers
VERIFY: HIDDEN frozen=True  entities on HIDDEN=339  emptied-layers-still-present=0  CLEAN