New Room Computation Parameters

Isidoro Aguilera of Aplicad submitted a comment asking how to migrate code making use of some room computation parameters from the Revit 2011 API to Revit 2012, specifically the built-in parameters

• LEVEL_ATTR_ROOM_COMPUTATION_AUTOMATIC
• LEVEL_ATTR_ROOM_COMPUTATION_HEIGHT

Question: I'm migrating a plug-in from 2011 and 2012 and experienced problems with the level type parameters BuiltInParameter.LEVEL_ATTR_ROOM_COMPUTATION_AUTOMATIC and BuiltInParameter.LEVEL_ATTR_ROOM_COMPUTATION_HEIGHT. They were writable in Revit 2011, but are read-only in Revit 2012.

Have you experienced a similar issue when migrating your samples?

The following code worked in Revit 2011, and fails in 2012:

  FilteredElementCollector collector 
    = new FilteredElementCollector( App.Document );
 
  IList elementos = collector
    .OfCategory( BuiltInCategory.OST_Levels )
    .WhereElementIsElementType()
    .ToElements();
 
  foreach( Element e in elementos )
  {
    Parameter p = e.get_Parameter( BuiltInParameter
      .LEVEL_ATTR_ROOM_COMPUTATION_AUTOMATIC );
 
    p.Set( 0 );
 
    p = e.get_Parameter( BuiltInParameter
      .LEVEL_ATTR_ROOM_COMPUTATION_HEIGHT );
 
    p.Set( 0 );
  }
 

Answer: In Revit 2012, levels no longer have the type parameters that existed in prior versions, and both the parameters you name are obsolete. Instead of using LEVEL_ATTR_ROOM_COMPUTATION_HEIGHT, you can now use LEVEL_ROOM_COMPUTATION_HEIGHT like this:

      FilteredElementCollector collector 
        = new FilteredElementCollector( 
          uidoc.Document );
 
      IList<Element> elementos = collector
        .OfClass( typeof( Level ) )
        .ToElements();
 
      foreach( Element e in elementos )
      {
        Parameter p = e.get_Parameter( BuiltInParameter
          .LEVEL_ROOM_COMPUTATION_HEIGHT );
 
        p.Set( 2.5 );
      }
 

For setting the room height, you can use ROOM_COMPUTATION_HEIGHT. The functionality around LEVEL_ATTR_ROOM_COMPUTATION_AUTOMATIC is totally unsupported now.