I feel like I'm close, but something is still missing.
I have made a modification to factor layout into it.
I have been able to confirm that it is now iterating through the correct block and does pull in that attribute, however, it still does not recognize the tag as equal to the attTag that is passed in. I'm attaching a quick screen shot of the issue I have with my output. If you look at the attribute names you can see that it creates a new attribute with an identical name.
Private Sub UpdateBlockAttribute(acBlkRef As BlockReference, attTag As String, textValue As String, Optional modelSpace As Boolean = True) Dim acBlkTable As BlockTable = Nothing Dim acBlkDef As BlockTableRecord = Nothing Dim acCurLyr As ObjectId Dim acAttRef As DatabaseServices.AttributeReference = Nothing Dim attFound As Boolean = False Dim acSpaceID As ObjectId Dim layoutDict As DBDictionary Dim dictEntry As DictionaryEntry Dim layout As Layout Dim layoutID As ObjectId Try layoutDict = acTrans.GetObject(acdb.LayoutDictionaryId, OpenMode.ForRead, False) 'If modelSpace = False Then 'acSpaceID = acBlkTable(BlockTableRecord.PaperSpace) 'Else 'acSpaceID = acBlkTable(BlockTableRecord.ModelSpace) ' End If ' acBlkDef = DirectCast(acTrans.GetObject(acSpaceID, OpenMode.ForRead), BlockTableRecord) If (layoutDict Nothing) Then For Each dictEntry In layoutDict layoutID = dictEntry.Value layout = acTrans.GetObject(layoutID, OpenMode.ForRead) acBlkTable = acTrans.GetObject(acdb.BlockTableId, OpenMode.ForRead) acBlkDef = DirectCast(acBlkTable(acBlkRef.Name).GetObject(OpenMode.ForRead), BlockTableRecord) Dim acLyrTbl As LayerTable = acTrans.GetObject(acdb.LayerTableId, OpenMode.ForRead) acCurLyr = acdb.Clayer If acLyrTbl.Has("0") Then acdb.Clayer = acLyrTbl("0") End If For Each acEntId In acBlkDef Dim acEnt As Entity = acTrans.GetObject(acEntId, OpenMode.ForRead) If Not IsNothing(acEnt) Then If acEnt.GetType.ToString = "Autodesk.AutoCAD.DatabaseServices.AttributeDefinition" Then Dim acAttDef As AttributeDefinition = DirectCast(acEnt, AttributeDefinition) If Not IsNothing(acAttDef) And Not acAttDef.Constant Then acAttRef = New AttributeReference acAttRef.SetAttributeFromBlock(acAttDef, DirectCast(acTrans.GetObject(acBlkRef.ObjectId, OpenMode.ForRead), BlockReference).BlockTransform) If acAttDef.Tag.ToString = attTag Or acAttRef.Tag.ToString = attTag.ToString Then attFound = True Exit For End If End If End If End If Next If attFound = True Then Exit For End If Next End If DirectCast(acTrans.GetObject(acBlkRef.ObjectId, OpenMode.ForRead), BlockReference).AttributeCollection.AppendAttribute(acAttRef) 'IF THE ATTRIBUTE DOES NOT EXIST, ADD A NEW ONE... If Not attFound Then acAttRef.Tag = attTag acAttRef.Justify = AttachmentPoint.MiddleCenter acTrans.AddNewlyCreatedDBObject(acAttRef, True) acAttRef.UpgradeOpen() End If acAttRef.TextString = textValue acAttRef.DowngradeOpen() 'acBlkDef.SynchronizeAttributes() acdb.Clayer = acCurLyr Catch ex As Exception MsgBox("Update Block Attribute: " & ex.Message & acAttRef.BlockName.ToString & " - " & acAttRef.Tag.ToString) End Try End Sub
