A filter in a schedule. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Remarks
The ScheduleFilter class represents a single filter in a schedule. A filter is a condition that must be satisfied for an element to appear in the schedule. All filters must be satisfied for an element to appear in the schedule.
A schedule can be filtered by data that is not displayed in the schedule by marking the field used for filtering as hidden using the ScheduleField.IsHidden property.