BlockTableRecord vs DynamicBlockTableRecord

[Anonymous]

   For Each myEntID As ObjectId In myBTR
                        Dim myEnt As Entity = myEntID.GetObject(OpenMode.ForRead) 'Read Entity

                        If TypeOf myEnt Is BlockReference Then
                            'If Block Reference
                            Dim myBRef As BlockReference = CType(myEnt, BlockReference)
                            Dim myBlockDef As BlockTableRecord =  myBRef.BlockTableRecord.GetObject(OpenMode.ForRead)
                            'myBRef.DynamicBlockTableRecord.GetObject(OpenMode.ForRead)
                    

What's the differencebetween blocktablerecord and dynamicblocktablerecord? 

When I'm trying to access the blocktablerecord what's the difference?

Will blocktablerecord work on dynamic blocks are they somewhat interchangeable?

[adam.nagy · Accepted solution]

HI there,

BlockTableRecord is the actual block record that is being used (i.e. shown) by the block reference.

The DynamicBlockTableRecord is the block (if the block reference is referencing a dynamic block) that the BlockTableRecord instance is based on (it's a specific variation of the dynamic block)

If you are already familiar with the concept of dynamic blocks from a user interface point of view, then the best thing, as always :), is to use a utility like ArxDbg/MgdDbg and look into the database and see for yourself the relation between the various objects.

I hope this helps. 

Cheers,

Adam Nagy

Autodesk Developer Network

[Anonymous]

Yah thanks that does help. I'm familiar with arxdbg. I'll fiddle around with it. I believe our site doesn't use many dynamic block.

What's the property or method to see if a block record is dynamic?

[adam.nagy]

Both BlockTableRecord and BlockReference classes have an IsDynamicBlock property that can be used to tell if the object is (or is referencing) a dynamic block.

Cheers,

Adam