多个单位转换的C#数据结构

public enum Unit
{
    Inches = 1,
    Feet = 12,
    Yards = 36,
    Miles = 63360,
    Millimeters = 25.4,
    Centimeters = 2.54,
    Meters = 100,
    Kilometers = 100000
}

public static double ConvertLength(double value, Unit fromUnit, Unit toUnit)
{
    double fromFactor = (double)fromUnit;
    double toFactor = (double)toUnit;
    return value * (toFactor / fromFactor);
}