Assembly: BioSharp.Core (in BioSharp.Core.dll) Version: 0.1.3191.26120 (0.1.0.0)
public static class FeatureFilter
In the Java version, FeatureFilter is an interface with a bunch of nested classes and whatnot. Since C# does not allow those inside an interface, the Java FeatureFilter is broken into two parts - this static class with all the nested classes and whatnot, along with the interface IFeatureFilter.
Original BioJava version by Matthew Pocock and Thomas Down. Port to C# by Doug Swisher.