topic Re: How to get a collection of all block table records in a file? in .NET Forum

How to get a collection of all block table records in a file?

OrmArTHe — Fri, 15 Nov 2024 13:10:45 GMT

How to get a collection of all block table records in a file?

Re: How to get a collection of all block table records in a file?

OrmArTHe — Fri, 15 Nov 2024 14:35:45 GMT

~~Solved~~ - by using this method:

TransactionManager.GetAllObjects

Edit: Not a solution. The method above gets all opened DBObjects in a transaction.

Re: How to get a collection of all block table records in a file?

norman.yuan — Fri, 15 Nov 2024 17:18:41 GMT

The object you need to open in order to get all BlockTableRecords, is, not surprisingly, BlockTable. You do:

using (var tran=[db].TransactionManager.StartTransaction()) { var tbl=(BlockTable)tran.GetObject([db].BlockTableId, OpenMode4.ForRead); IEnumerable<BlockTableRecord> allRecords= tbl.Cast<ObjectId>().Select(id=>(BlockTableRecord)tran.GetObject(id, OpenMode.ForRead); // work with the records as needed ... ... tran.Commit(); }

Re: How to get a collection of all block table records in a file?

ActivistInvestor — Fri, 15 Nov 2024 18:31:16 GMT

public static class MyExtensions { public static IEnumerable<T> GetObjects<T>(this IEnumerable<ObjectId> ids, Transaction tr, OpenMode mode = OpenMode.ForRead) where T : DBObject { if(ids == null) throw new ArgumentNullException(nameof(ids)); if(tr == null) throw new ArgumentNullException(nameof(tr)); RXClass rxclass = RXObject.GetClass(typeof(T)); foreach(ObjectId id in ids) { if(id.ObjectClass.IsDerivedFrom(rxclass)) { yield return Unsafe.As<T>(tr.GetObject(id, mode)); } } } } public static class Example { [CommandMethod("LISTBLOCKNAMES")] public static void ListBlockNames() { Document doc = Application.DocumentManager.MdiActiveDocument; Editor ed = doc.Editor; Database db = doc.Database; using(var trans = doc.TransactionManager.StartTransaction()) { var blockTable = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead); var ids = blockTable.Cast<ObjectId>(); var blockTableRecords = ids.GetObjects<BlockTableRecord>(trans); foreach(BlockTableRecord btr in blockTableRecords) { /// btr is only usable up to the call to Commit() below. ed.WriteMessage($"\n{btr.Name}"); } trans.Commit(); } } }

Re: How to get a collection of all block table records in a file?

OrmArTHe — Tue, 19 Nov 2024 08:25:34 GMT

ed.WriteMessage($"\n{btr.Name}");

I'm checking the docs and I don't see that block table records have 'Name' property...

Re: How to get a collection of all block table records in a file?

_gile — Tue, 19 Nov 2024 08:31:38 GMT

@OrmArTHe a écrit :
ed.WriteMessage($"\n{btr.Name}");
I'm checking the docs and I don't see that block table records have 'Name' property...

BlockTableRecord derives from SymbolTableRecord which has a Name property.

Re: How to get a collection of all block table records in a file?

OrmArTHe — Tue, 19 Nov 2024 08:55:11 GMT

Could you please explain this line:

var blockTableRecords = ids.GetObjects<BlockTableRecord>(trans);

I can't seem to find GetObjects method in the docs...

Re: How to get a collection of all block table records in a file?

OrmArTHe — Tue, 19 Nov 2024 09:02:27 GMT

Got it. But GetObject method returns ObjectId... How do I convert it to BlockTableRecord so I can access its Name property?

Re: How to get a collection of all block table records in a file?

_gile — Tue, 19 Nov 2024 09:10:05 GMT

@OrmArTHe a écrit :

Could you please explain this line:
var blockTableRecords = ids.GetObjects<BlockTableRecord>(trans);
I can't seem to find GetObjects method in the docs...

GetObjects<T> method is defined in MyExtensions class.

Re: How to get a collection of all block table records in a file?

_gile — Tue, 19 Nov 2024 09:27:53 GMT

Here's a method wich return a collection of all the the block table record names.

private static IEnumerable<string> GetBlockNames(Database db) { using (var tr = new OpenCloseTransaction()) { var blockTable = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead); foreach (ObjectId id in blockTable) { var btr = (BlockTableRecord)tr.GetObject(id, OpenMode.ForRead); yield return btr.Name; } tr.Commit(); } }

Here's a testing command:

[CommandMethod("TEST")] public static void Test() { var doc = Application.DocumentManager.MdiActiveDocument; var db = doc.Database; var ed = doc.Editor; foreach (string name in GetBlockNames(db)) { ed.WriteMessage($"\n{name}"); } }

Re: How to get a collection of all block table records in a file?

jabowabo — Tue, 19 Nov 2024 15:50:31 GMT

This is not directly related to this topic, but I just want to thank @ActivistInvestor and @_gile for your contributions. Even if a topic is not something I'm directly needing help on, I almost always learn something from your posts. Thank you both!

Re: How to get a collection of all block table records in a file?

ActivistInvestor — Tue, 19 Nov 2024 15:55:51 GMT

The GetObjects method is in the code that I posted, it is not built into the api. Did you try the code or are you simply looking at it?

Re: How to get a collection of all block table records in a file?

OrmArTHe — Wed, 20 Nov 2024 07:46:09 GMT

Generally, I try to understand it before trying it, but yes, I was too hasty and I missed your 'MyExtensions' Class... Sorry about that... I appreciate your help, your solution if really robust...