Gets the number of the AssetProperty(s) in the object.
Namespace: Autodesk.Revit.Utility
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Namespace: Autodesk.Revit.Utility
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)