Get BlockReference and Dynamic Block Count

[Anonymous]

Hello,

Im trying to get all Block and Dynamic Blocks from my Drawing and the actual Count. But im having a weird issue where the Count of each block is 1 more than Expected. To get the count of the normal BlockReferences im counting the Duplicates. But for the dynamic Blocks im getting the actual count

with var blockCount= anonymousBtr.GetBlockReferenceIds(true, true).Count;

What im trying for Normal Blocks:

 public static void GetShelfBlock() {
            var acDoc = Application.DocumentManager.MdiActiveDocument;
            var acDb = acDoc.Database;
            var dataCollection = new List<DataModel>();

            using (var tr = acDb.TransactionManager.StartTransaction()) {

                try {
                    var entClass = RXObject.GetClass(typeof(Entity));
                    var modelSpaceId = SymbolUtilityServices.GetBlockModelSpaceId(acDb);
                    var modelSpace = (BlockTableRecord)tr.GetObject(modelSpaceId, OpenMode.ForRead);

                    foreach (var id in modelSpace) {
                        if (!id.ObjectClass.IsDerivedFrom(entClass)) {
                            continue;
                        }

                        var ent = (Entity)tr.GetObject(id, OpenMode.ForRead);
                        if (!ent.GetType().ToString().Contains(typeof(BlockReference).Name)) {
				continue;
                        }

                        var reference = ent as BlockReference;
                        if (reference == null) {
                            continue;
                        }

                        var blockReference = reference;
                        if (CheckPattern(blockReference.Name)) {
                            dataCollection.Add(PrepareShelfObject(blockReference));
                        }
                    }
                    tr.Commit();
                    tr.Dispose();

                    dataCollection.AddRange(GetDynamicBlocks(SearchPatterns));
                    if (dataCollection.Count > 0) {
                        Serialize(dataCollection, DataType.Regale);
                    }
                }
                catch (Exception ex) {
                    acDoc.Editor.WriteMessage(ex.Message);
                }
            }
        }

what im trying for Dynamic Blocks where im getting the count with var blockCount= anonymousBtr.GetBlockReferenceIds(true, true).Count;

  public static List<DataModel> GetDynamicBlocks() {
            var db = Application.DocumentManager.MdiActiveDocument.Database;
            var dynamicBlockList = new List<DataModel>();
            var tempList = new List<object>();
            using (var trans = db.TransactionManager.StartTransaction()) {
                var bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);

                foreach (var btrId in bt) {

                    var btr = (BlockTableRecord)trans.GetObject(btrId, OpenMode.ForRead);
                    if (!btr.IsDynamicBlock) {
                        continue;
                    }

                    var anonymousIds = btr.GetAnonymousBlockIds();
                    var dynBlockRefs = new ObjectIdCollection();

                    foreach (ObjectId anonymousBtrId in anonymousIds) {
                        var anonymousBtr = (BlockTableRecord)trans.GetObject(anonymousBtrId, OpenMode.ForRead);
                        var blockRefIds = anonymousBtr.GetBlockReferenceIds(true, true);
                        foreach (ObjectId id in blockRefIds) {
                            dynBlockRefs.Add(id);
                        }
                    }

                    if (searchPattern.Any(btr.Name.StartsWith)) {
                        dynamicBlockList.Add(PrepareDynObject(btr));
                    }
                }
                trans.Commit();
                trans.Dispose();
            }
            return dynamicBlockList;
        }

Is there a way to Get all the blocks and there Count ?? Im before giving up i tried everything for 3 days now .... Maybe somebody can help me out.

Thanks

[Anonymous]

Looking quickly at your code and post I'm not quite sure I understand, but maybe sharing some code I use might help.

The code which prompts user to select a block reference then it selects all instances in the current space, which I think your trying something similar from what I can gather from your code example.

Here is command method

 [CommandMethod("HpadSelection", "BLKSS", CommandFlags.Redraw | CommandFlags.Transparent)]
        public void BLKSS()
        {
            PromptEntityOptions peo = new PromptEntityOptions("\nSelect Block Reference");
            peo.SetRejectMessage("\nNot a Block Reference");
            peo.AddAllowedClass(typeof(BlockReference), true);
            peo.AllowObjectOnLockedLayer = true;

            PromptEntityResult per = Ed.GetEntity(peo);

            if (per.Status == PromptStatus.OK)
            {
                using (Transaction trx = Doc.TransactionManager.StartTransaction())
                {
                    BlockReference bref = per.ObjectId.GetDBObject<BlockReference>();
                    BlockTableRecord btr = bref.GetEffectiveBlockTableRecord();

                    var currentSpaceIds = btr.GetAllBlockReferenceIds(true, false).Where<DBObject>(dbo => dbo.OwnerId == Db.CurrentSpaceId);
                    ObjectId[] ids = currentSpaceIds.ToArray();

                    Ed.SetImpliedSelection(ids);
                    Ed.WriteLine("{0} blocks selected", ids.Length);

                    trx.Commit();
                }
            }
            else
            {
                Ed.WriteLine("Exited");
            }
        }

Some supporting extension methods used.

        /// <summary>
        /// Method for getting all blockreference Ids
        /// </summary>
        /// <param name="btr">The BTR.</param>
        /// <param name="trx">The TRX.</param>
        /// <param name="directOnly">if set to <c>true</c> [direct only].</param>
        /// <param name="forceValidity">if set to <c>true</c> [force validity].</param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        public static ObjectIdCollection GetAllBlockReferenceIds(this BlockTableRecord btr, Transaction trx,
            bool directOnly, bool forceValidity)
        {
            if (trx == null)
            {
                throw new Exception(ErrorStatus.NoActiveTransactions);
            }

            ObjectIdCollection blockReferenceIds = btr.GetBlockReferenceIds(directOnly, forceValidity);

            if (!btr.IsDynamicBlock) return blockReferenceIds;
            foreach (ObjectId id in btr.GetAnonymousBlockIds())
            {
                BlockTableRecord record = trx.GetObject(id, OpenMode.ForRead) as BlockTableRecord;
                blockReferenceIds.Add(record.GetBlockReferenceIds(directOnly, forceValidity));
            }
            return blockReferenceIds;
        }

        /// <summary>
        /// Gets all block reference ids.
        /// </summary>
        /// <param name="btr">The BTR.</param>
        /// <param name="directOnly">if set to <c>true</c> [direct only].</param>
        /// <param name="forceValidity">if set to <c>true</c> [force validity].</param>
        /// <returns></returns>
        public static ObjectIdCollection GetAllBlockReferenceIds(this BlockTableRecord btr, bool directOnly,
            bool forceValidity)
        {
            return btr.GetAllBlockReferenceIds(btr.Database.TransactionManager.TopTransaction, directOnly, forceValidity);
        }

[Anonymous]

Thanks for your time, 

Im trying to get a list of all blocks and dynmic blocks and get the count of each block in the drawing,

Im trying everything but failing for 2 days now. 

Just need the block names and the count of each block.

[_gile · Accepted solution]

Hi,

Here's a simple "count by name" example using Linq extension methods.

        [CommandMethod("ListBlocks")]
        public void ListBlocks()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;

            using (var tr = db.TransactionManager.StartOpenCloseTransaction())
            {
                Func<BlockReference, string> getEffectiveName = (br) => 
                    br.IsDynamicBlock ?
                    ((BlockTableRecord)tr.GetObject(br.DynamicBlockTableRecord, OpenMode.ForRead)).Name :
                    br.Name;
                var modelspace = (BlockTableRecord)tr.GetObject(
                    SymbolUtilityServices.GetBlockModelSpaceId(db), OpenMode.ForRead);
                var brclass = RXObject.GetClass(typeof(BlockReference));
                var blocks = modelspace
                    .Cast<ObjectId>()
                    .Where(id => id.ObjectClass == brclass)
                    .Select(id => (BlockReference)tr.GetObject(id, OpenMode.ForRead))
                    .GroupBy(br => getEffectiveName(br));
                foreach (var group in blocks)
                {
                    ed.WriteMessage($"\n{group.Key}: {group.Count()}");
                }
                tr.Commit();
            }
        }

[Anonymous]

Thanks you literally saved my Life !!! 🙂

[Alexander.Rivilis]

@_gile

I do not recommend checking IsDynamicBlock property. It is known issue if dynamic block is non-uniform scale its IsDynamicBlock property is false.

http://adn-cis.org/forum/index.php?topic=7275.msg21893#msg21893

[_gile · Accepted solution]

@Alexander.Rivilis

Thanks, I didn't know this.

So, the upper code can be simplified like this:

        [CommandMethod("ListBlocks")]
        public void ListBlocks()
        {
            var doc = Application.DocumentManager.MdiActiveDocument;
            var db = doc.Database;
            var ed = doc.Editor;

            using (var tr = db.TransactionManager.StartOpenCloseTransaction())
            {
                var modelSpace = (BlockTableRecord)tr.GetObject(
                    SymbolUtilityServices.GetBlockModelSpaceId(db), OpenMode.ForRead);

                var brclass = RXObject.GetClass(typeof(BlockReference));

                var blocks = modelSpace
                    .Cast<ObjectId>()
                    .Where(id => id.ObjectClass == brclass)
                    .Select(id => (BlockReference)tr.GetObject(id, OpenMode.ForRead))
                    .GroupBy(br => ((BlockTableRecord)tr.GetObject(
                        br.DynamicBlockTableRecord, OpenMode.ForRead)).Name);

                foreach (var group in blocks)
                {
                    ed.WriteMessage($"\n{group.Key}: {group.Count()}");
                }
                tr.Commit();
            }
        }

[Anonymous]

So is checking for IsDynamic wrong? Because the code from _gile works as excpected.

I cant read the site you linked because its in russian 🙂 

Will i have problems checking for IsDynamic ? Will i miss some blocks as a result of it? 

Thanks 

[Alexander.Rivilis]

---

@Anonymous wrote:

Will i have problems checking for IsDynamic ? Will i miss some blocks as a result of it? 

Thanks 

---

If some of your dynamic block reference has different scale for X, Y or Z axis, then IsDynamic return false instead of true. Also if such dynamic block reference is mirrored then IsDynamic is false. I've sent this issue year ago to ADN DevHelp. @Virupaksha_aithal can confirm this fact.

[Anonymous]

Thanks for your answer sir.
Without checking IsDynamic in your solution posted above will i also get the names of dynamic blocks ?

[_gile]

---

valon.k a écrit :
Thanks for your answer sir.
Without checking IsDynamic in your solution posted above will i also get the names of dynamic blocks ?

---

Yes, if you look at the GroupBy parameter which is a lambda function which returns the name of the block reference DynamicBlockTableRecord (for static blocks, the DynamicBlockTableRecord is equal to the blockTableRecord).

Just try it...