DGN Import, Block References are "Line" Type and I can't explode or delete any of them

[juicyorange]

Hey all,

 

I am running into an issue with working with an DGN imported DWG file.

 

I import the DGN and run my script and none of the blocks are erased.

 

I have found through debugging that the blocks are type "Line" for some reason and because of that, I can't interact with them in any way (see attached screenshot).

 

Has anyone else had this issue before? What am I missing?

Here is the code:

 

private static List<string> blockPrefixes = new List<string> { "CP", "CL", "GRATE", "GRID" };

[CommandMethod("CleanDGN")]
public void ImportAndCleanDwg()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;

    using (Transaction tr = db.TransactionManager.StartTransaction())
    {
        // Remove blocks
        BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
        foreach (ObjectId btrId in bt)
        {
            BlockTableRecord btr = (BlockTableRecord)tr.GetObject(btrId, OpenMode.ForRead);
            if (blockPrefixes.Any(prefix => btr.Name.StartsWith(prefix)))
            {
                // delete each reference in the drawing
                foreach (ObjectId id in btr)
                {
                    DBObject obj = tr.GetObject(id, OpenMode.ForWrite);

                  	// this is where I checked the type to see why none of the blocks are erased and this is where i found out it is type "Line".
                    Type type = obj.GetType();

                    // Check if the object is a BlockReference
                    if (obj is BlockReference)
                    {
                        obj.Erase();
                    }
                }

                btr.UpgradeOpen();
                btr.Erase();
            }
        }

        tr.Commit();
    }
}

 

[juicyorange]

I figured it out, I was overcomplicating it.

I wanted to find specific blocks, but after looking at the drawing further, I don't want any of the blocks in it, just the subcomponents and I greatly simplified what I was doing.

 

this is what got me there.

[CommandMethod("CleanDGN")]
public void ImportAndCleanDwg()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;

    using (Transaction tr = db.TransactionManager.StartTransaction())
    {
        // Get the current space (ModelSpace or PaperSpace)
        BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
        BlockTableRecord currentSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);

        // Iterate over each object in the current space
        foreach (ObjectId id in currentSpace)
        {
            DBObject obj = tr.GetObject(id, OpenMode.ForWrite);

            // Check if the object is a BlockReference
            if (obj is BlockReference blockRef)
            {
                // Explode the block reference
                DBObjectCollection dbObjCollection = new DBObjectCollection();
                blockRef.Explode(dbObjCollection);

                // Add the exploded entities to the current space
                foreach (DBObject dbObj in dbObjCollection)
                {
                    Entity ent = dbObj as Entity;
                    if (ent != null)
                    {
                        currentSpace.AppendEntity(ent);
                        tr.AddNewlyCreatedDBObject(ent, true);
                    }
                }

                // Erase the block reference
                blockRef.Erase();
            }
        }

        tr.Commit();
    }
}