Get the material painted on the element's face. Returns invalidElementId if the face is not painted. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
| C# | 
|---|
   |  
| Visual Basic | 
|---|
   |  
| Visual C++ | 
|---|
   |  
Parameters
- elementId
 -  Type:  Autodesk.Revit.DB ElementId  
The element that the face belongs to. 
- face
 -  Type:  Autodesk.Revit.DB Face  
The painted element's face. 
Return Value
The material's Id painted on the element's face.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | The element elementId does not exist in the document -or- The face doesn't belong to the element | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |