topic Re: How to use C# to traverse all objects in DWG? in .NET Forum

How to use C# to traverse all objects in DWG?

zhengyunyang2019 — Tue, 21 Jul 2020 08:07:51 GMT

I need to traverse all objects, and then get the data type of each object. I am using .net api for the first time, I have used objectARX before.

Re: How to use C# to traverse all objects in DWG?

Alexander.Rivilis — Tue, 21 Jul 2020 08:32:18 GMT

All objects in ModelSpace/PaperSpace or all objects in Database?

First case is very simple. Second case is more complicated.

Re: How to use C# to traverse all objects in DWG?

_gile — Tue, 21 Jul 2020 16:07:02 GMT

@Alexander.Rivilis Not so complicated...

Here's an example for both: all objects and all entities in spaces.

using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.Runtime; using System.Collections.Generic; using AcAp = Autodesk.AutoCAD.ApplicationServices.Core.Application; namespace GetAllObjectsInDatabase { public class Commands { [CommandMethod("TEST1")] public static void Test1() { var doc = AcAp.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; foreach (var item in GetAllObjects(db)) { ed.WriteMessage($"\n{item.Key.Handle,-6} {item.Value}"); } } [CommandMethod("TEST2")] public static void Test2() { var doc = AcAp.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; foreach (var item in GetAllEntities(db)) { ed.WriteMessage($"\n{item.Key.Handle,-6} {item.Value}"); } } static Dictionary<ObjectId, string> GetAllObjects(Database db) { var dict = new Dictionary<ObjectId, string>(); for (long i = 0; i < db.Handseed.Value; i++) { if (db.TryGetObjectId(new Handle(i), out ObjectId id)) dict.Add(id, id.ObjectClass.Name); } return dict; } static Dictionary<ObjectId, string> GetAllEntities(Database db) { var dict = new Dictionary<ObjectId, string>(); using (var tr = db.TransactionManager.StartOpenCloseTransaction()) { var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead); foreach (var btrId in bt) { var btr = (BlockTableRecord)tr.GetObject(btrId, OpenMode.ForRead); if (btr.IsLayout) { foreach (var id in btr) { dict.Add(id, id.ObjectClass.Name); } } } tr.Commit(); } return dict; } } }

Re: How to use C# to traverse all objects in DWG?

Alexander.Rivilis — Tue, 21 Jul 2020 16:18:35 GMT

@_gile

If you change

for (long i = 0; i < db.Handseed.Value; i++)

with

for (long i = db.BlockTableId.Handle.Value; i < db.Handseed.Value; i++)

it will be more useful. IMHO.

Re: How to use C# to traverse all objects in DWG?

_gile — Tue, 21 Jul 2020 16:39:14 GMT

@Alexander.Rivilis From the tests I did, the BlockTable handle is always 1 😉

Re: How to use C# to traverse all objects in DWG?

Alexander.Rivilis — Tue, 21 Jul 2020 17:10:14 GMT

@_gile wrote:

@Alexander.Rivilis From the tests I did, the BlockTable handle is always 1 😉

I have a problem with some dwg-files, posted to me, which start handle is very-very big value.

Re: How to use C# to traverse all objects in DWG?

_gile — Tue, 21 Jul 2020 17:19:04 GMT

@Alexander.Rivilis You're right, your silution is more robust and efficient.

Re: How to use C# to traverse all objects in DWG?

zhengyunyang2019 — Wed, 22 Jul 2020 01:39:07 GMT

I can't distinguish between all objects in the model space and all objects in the database, I think they are the same. I want to get all the graphics-related data in the drawing. My job is to use another graphics engine to redraw these data.

I remember you, you helped me many times in the objectARX forum, thank you.😀

Re: How to use C# to traverse all objects in DWG?

zhengyunyang2019 — Wed, 22 Jul 2020 01:40:54 GMT

I am learning your code, thank you

Re: How to use C# to traverse all objects in DWG?

Alexander.Rivilis — Wed, 22 Jul 2020 08:31:01 GMT

@zhengyunyang2019 wrote:

I can't distinguish between all objects in the model space and all objects in the database, I think they are the same...

No. And if you check @_gile code you can find big difference.

For example, layer, block, layout, etc. also objects but not a part of model space.