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VB.net / edit inserted dynamic block's attribute textstring and parameter's value


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i can use VB.net to edit normal inserted block reference's attribute textstring but it's not working for dynamic block, pls help.

Best regard.

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Public Sub UpdateAtt(ByVal tr As Transaction, ByVal objID As ObjectId)        
           Dim br As BlockReference = DirectCast(tr.GetObject(objID, OpenMode.ForWrite), BlockReference)
           Dim btr As BlockTableRecord = DirectCast(tr.GetObject(br.DynamicBlockTableRecord, OpenMode.ForWrite), BlockTableRecord)
           For Each attID As ObjectId In btr
               Dim ent As DBObject = tr.GetObject(attID, OpenMode.ForWrite)
               If TypeOf ent Is AttributeDefinition Then
                   Dim AttDef As AttributeDefinition = ent
                   If AttDef.Tag = "SH" Then AttDef.TextString = "111"                    
               End If

End Sub

If br is not dynamic block, br's attribute can edit by br's attribute collection, but it's not working for dynamic block, so i think this work can do by attribute definition but it's not working too, thanks for read...

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