Implement direct conversion functions

CodeGen/Generators/UnitsNetGen/QuantityGenerator.cs

@@ -1020,7 +1020,22 @@ private bool TryToUnit({_quantity.Name}Unit unit, [NotNullWhen(true)] out {_quan
             }}
 
             {_quantity.Name}? convertedOrNull = (Unit, unit) switch
-            {{
+            {{");
+
+            foreach(Unit unit in _quantity.Units)
+            {
+                foreach(var conversion in unit.Conversions)
+                {
+                    var func2 = conversion.Formula.Replace("{x}", "_value");
+                    Writer.WL($@"
+                ({_quantity.Name}Unit.{unit.SingularName}, {_unitEnumName}.{conversion.Target}) => new {_quantity.Name}({func2}, {_unitEnumName}.{conversion.Target}),");
+                }
+            }
+
+            if(_quantity.Units.Any(unit => unit.Conversions.Any()))
+                Writer.WL();
+
+            Writer.WL($@"
                 // {_quantity.Name}Unit -> BaseUnit");
 
             foreach (Unit unit in _quantity.Units)

CodeGen/JsonTypes/Conversions.cs

@@ -0,0 +1,19 @@
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace CodeGen.JsonTypes
+{
+    internal class Conversions
+    {
+        // 0649 Field is never assigned to
+#pragma warning disable 0649
+
+        public string Target = null!;
+        public string Formula = null!;
+
+        // 0649 Field is never assigned to
+#pragma warning restore 0649
+    }
+}

CodeGen/JsonTypes/Unit.cs

@@ -11,6 +11,7 @@ internal class Unit
 #pragma warning disable 0649
 
         public BaseUnits? BaseUnits;
+        public Conversions[] Conversions = Array.Empty<Conversions>();
         public string FromBaseToUnitFunc = null!;
         public string FromUnitToBaseFunc = null!;
         public Localization[] Localization = Array.Empty<Localization>();

Common/UnitDefinitions/Mass.json

@@ -136,6 +136,12 @@
       "BaseUnits": {
         "M": "Ounce"
       },
+      "Conversions": [
+        {
+          "Target": "Pound",
+          "Formula": "{x} / 16.0"
+        }
+      ],
       "FromUnitToBaseFunc": "{x} * 0.028349523125",
       "FromBaseToUnitFunc": "{x} / 0.028349523125",
       "XmlDocSummary": "The international avoirdupois ounce (abbreviated oz) is defined as exactly 28.349523125 g under the international yard and pound agreement of 1959, signed by the United States and countries of the Commonwealth of Nations. 16 oz make up an avoirdupois pound.",