Converts a family to be face host based. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- document
-  Type:  Autodesk.Revit.DB Document  
 The document containing the family to be converted.
- familyId
-  Type:  Autodesk.Revit.DB ElementId  
 The family id.
Remarks
 Converts a family hosted by some element other than a face to be hosted by a face. This is done by replacing the existing host (wall, roof, ceiling, floor) with a face. Conversion can succeed only if FamilyUtils.FamilyCanConvertToFaceHostBased() returns true. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | The input familyId cannot be converted to face host based. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL | 
| Autodesk.Revit.Exceptions InvalidOperationException | Failed to convert the family to face host based. -or- The family is already unhosted. |