Returns the number of RhinoScript user data items on an object's attributes.
Rhino.AttributeDataCount (strObject)
| strObject | Required. String. The object's identifier. | 
| Number | The number of RhinoScript object user data items if successful. | 
| Null | If not successful, or on error. | 
Dim strObject, intCount
strObject = Rhino.GetObject("Select object")
If Not IsNull(strObject) Then
intCount = Rhino.AttributeDataCount(strObject)
Rhino.Print "Object attribute user data count: " & CStr(intCount)
End If