Set Room Limit Offset

[dhanait_ajay13]

i want to set negative value to room Limit Offset and set room UpperLimit is upper level.

manually it getting negative value but through programming it throw error/warning.

Floor floor = doc.GetElement(elementId) as Floor;

Parameter upperlevel_floor_Thickness = floor.LookupParameter("Thickness");
FloorThickness_ = Convert.ToDouble(upperlevel_floor_Thickness.AsValueString());

Parameter para_room_LimitOffset = room.LookupParameter("Limit Offset");

room.UpperLimit = Upper_level;
para_room_LimitOffset.Set(-FloorThickness_);

[jeremy_tammik · Accepted solution]

The value of the Thickness parameter is a real number.

In the Revit database, all length values as stored in imperial feet units:

http://thebuildingcoder.typepad.com/blog/2011/03/internal-imperial-units.html

So, both Thickness and Limit Offset need to be specified in feet.

AsValueString is converting it to a string, possibly returning it formatted as it would be displayed in the end user interface, possibly applying a conversion from the internal imperial units to something else, e.g., meters or millimetres or something.

Therefore, your code may be using some totally weird value when setting the Limit Offset.

I suggest that you eliminate the use of AsValueString and Convert.ToDouble.

Use AsDouble instead, and no conversion will be needed.

I mostly avoid using AsValueString myself.