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C3D-PSUNDO · Undo bad block import, find real title block done

Erases the bad SS_BLOCK_22X17 reference and purges the 770-entity definition (the source DWG is a full survey drawing, not a title block). Lists the source DWG layouts and which blocks they use.

C# payload

// Back out the bad import: SS_BLOCK_22X17.dwg is a full survey drawing, not a title block, so
// Db.Insert pulled 770 model-space entities (564 CogoPoints, a TinSurface, parcels...) in as one
// block. Erase the inserted reference and purge the definition.
// Also report what the source DWG's two 215-entity paper spaces contain, since those are the
// likely 22x17 sheets.
// Host owns Tx - no using/Commit here.
const string BLK    = "SS_BLOCK_22X17";
const string LAYOUT = "22X17 C";

var layDict = (DBDictionary)Tx.GetObject(Db.LayoutDictionaryId, OpenMode.ForRead);
var layout  = (Layout)Tx.GetObject(layDict.GetAt(LAYOUT), OpenMode.ForRead);
var ps      = (BlockTableRecord)Tx.GetObject(layout.BlockTableRecordId, OpenMode.ForWrite);

int erased = 0;
foreach (ObjectId id in ps)
{
    var br = Tx.GetObject(id, OpenMode.ForRead) as BlockReference;
    if (br == null) continue;
    var def = (BlockTableRecord)Tx.GetObject(br.BlockTableRecord, OpenMode.ForRead);
    if (def.Name != BLK) continue;
    var w = (BlockReference)Tx.GetObject(id, OpenMode.ForWrite);
    w.Erase();
    erased++;
}
Log($"Erased {erased} bad '{BLK}' reference(s) from '{LAYOUT}'.");

var bt = (BlockTable)Tx.GetObject(Db.BlockTableId, OpenMode.ForWrite);
if (bt.Has(BLK))
{
    var def = (BlockTableRecord)Tx.GetObject(bt[BLK], OpenMode.ForWrite);
    if (def.GetBlockReferenceIds(true, true).Count == 0)
    { def.Erase(); Log($"Purged the '{BLK}' definition (770 stray entities)."); }
    else Log($"'{BLK}' still referenced elsewhere - left in place.");
}

// what's in the source paper spaces?
const string DWG = @"C:\Users\sanja\OneDrive\_SurveyDisco\SS_BLOCK_22X17.dwg";
using (var side = new Database(false, true))
{
    side.ReadDwgFile(DWG, System.IO.FileShare.Read, true, null);
    side.CloseInput(true);
    using (var stx = side.TransactionManager.StartTransaction())
    {
        var sld = (DBDictionary)stx.GetObject(side.LayoutDictionaryId, OpenMode.ForRead);
        foreach (DBDictionaryEntry e in sld)
        {
            var lay = (Layout)stx.GetObject(e.Value, OpenMode.ForRead);
            var btr = (BlockTableRecord)stx.GetObject(lay.BlockTableRecordId, OpenMode.ForRead);
            int n = 0; var brefs = new List<string>();
            foreach (ObjectId x in btr)
            {
                n++;
                var b2 = stx.GetObject(x, OpenMode.ForRead) as BlockReference;
                if (b2 != null)
                {
                    var d2 = (BlockTableRecord)stx.GetObject(b2.BlockTableRecord, OpenMode.ForRead);
                    if (!brefs.Contains(d2.Name)) brefs.Add(d2.Name);
                }
            }
            Log($"  source layout '{lay.LayoutName}': {n} entities, paper {lay.PlotPaperSize}, blocks used: {string.Join(", ", brefs)}");
        }
        stx.Commit();
    }
}

Result

Erased 1 bad 'SS_BLOCK_22X17' reference(s) from '22X17 C'.
Purged the 'SS_BLOCK_22X17' definition (770 stray entities).
  source layout '11X17': 215 entities, paper (279.3999938964844,431.79998779296875), blocks used: SS_LEGEND, SS_BLOCK_11X17
  source layout '13709-779': 215 entities, paper (279.3999938964844,431.79998779296875), blocks used: SS_LEGEND, SS_BLOCK_11X17
  source layout '22X17': 5 entities, paper (558.7999877929688,431.79998779296875), blocks used: SS_BLOCK_11X17
  source layout 'Model': 770 entities, paper (215.89999389648438,279.3999938964844), blocks used: