How to get the name of the materials associated to the faces of Rooms in Revit

I want to write a Macro in Autodesk Revit for getting all the materials associated to the faces of my rooms and then write them as values for predefined Shared Parameters. Is there a way to achieve this with C#? Also I'd like to have the walls faces according to the cardinal position (North, South, West, East). Any hint about it will be very appreciated.

Solution

I would suggest raising separate threads for different questions.

Regarding the wall faces facing cardinal positions, please refer to the DirectionCalculation FindSouthFacing Revit SDK sample.