Added Mils and Microinches length units.

Author: gpetrou

Src/UnitsNet/Length.cs

@@ -90,6 +90,16 @@ public double Nanometers
             get { return Meters*1E9; }
         }
 
+        public double Microinch
+        {
+            get { return Meters * 39370078.7; }
+        }
+
+        public double Mil
+        {
+            get { return Meters * 39370.0787; }
+        }
+       
         #endregion
 
         #region Static
@@ -170,6 +180,16 @@ public static Length FromNanometers(double nm)
             return FromMeters(nm*1E-9);
         }
 
+        public static Length FromMicroinches(double mi)
+        {
+            return FromMeters(mi / 39370078.7);
+        }
+
+        public static Length FromMils(double m)
+        {
+            return FromMeters(m / 39370.0787);
+        }
+
         #endregion
 
         #region Arithmetic operators

Src/UnitsNet/Unit.cs

@@ -35,6 +35,8 @@ public enum Unit
         Nanometer,
 
         // Length (imperial)
+        Microinch,
+        Mil,
         Mile,
         Yard,
         Foot,

Src/UnitsNet/UnitConverter.cs

@@ -210,6 +210,10 @@ private static bool TryConvertLength(double value, Unit fromUnit, Unit toUnit, o
                     return TryConvert(Length.FromFeet(value), toUnit, out newValue);
                 case Unit.Inch:
                     return TryConvert(Length.FromInches(value), toUnit, out newValue);
+               case Unit.Mil:
+                    return TryConvert(Length.FromMils(value), toUnit, out newValue);
+               case Unit.Microinch:
+                    return TryConvert(Length.FromMicroinches(value), toUnit, out newValue);
 
                 default:
                     newValue = 0;

Tests/LengthTests.cs

@@ -25,6 +25,8 @@ public void MetersToDistanceUnits()
             Assert.AreEqual(1.09361, meter.Yards, Delta);
             Assert.AreEqual(3.28084, meter.Feet, Delta);
             Assert.AreEqual(39.3701, meter.Inches, Delta);
+            Assert.AreEqual(39370078.7, meter.Microinch, Delta);
+            Assert.AreEqual(39370.0787, meter.Mil, Delta);
         }
 
         [Test]
@@ -44,6 +46,8 @@ public void DistanceUnitsRoundTrip()
             Assert.AreEqual(1, Length.FromYards(meter.Yards).Meters, Delta);
             Assert.AreEqual(1, Length.FromFeet(meter.Feet).Meters, Delta);
             Assert.AreEqual(1, Length.FromInches(meter.Inches).Meters, Delta);
+            Assert.AreEqual(1, Length.FromMicroinches(meter.Microinch).Meters, Delta);
+            Assert.AreEqual(1, Length.FromMils(meter.Mil).Meters, Delta);
         }
 
         [Test]