using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace FWindSoft.Revit { public static class DoubleExtension { public const double Coff = 304.8; public static double MmToFt(this double input) { return input / Coff; } public static double MmFromFt(this double input) { return input* Coff; } } }