Gets the level if by the height of the element. 
   Namespace:   Autodesk.Revit.DB.IFC  
  Assembly:   RevitAPIIFC  (in RevitAPIIFC.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Parameters
- exporterIFC
 -  Type:  Autodesk.Revit.DB.IFC ExporterIFC  
The exporter. 
- elem
 -  Type:  Autodesk.Revit.DB Element  
The element. 
Return Value
The level id.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |