Revit.Plugln/FWindSoft/FWindSoft.Revit/Extension/DoubleExtension.cs

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;
        }
    }
}