UnitSystem inplementation started, Calculation started

UnitSystem/Enums/SystemTypes.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelper.UnitSystem.Enums
+{
+    public enum Force
+    {
+    }
+    public enum Pressure
+    {
+    }
+    public enum Length
+    {
+        M
+    }
+    public enum MultiplyPrefix
+    {
+        m
+    }
+}

UnitSystem/Systems/IUnitSystem.cs

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+using System;
+using StructureHelper.UnitSystem.Enums;
+
+namespace StructureHelper.UnitSystem.Systems
+{
+    public interface IUnitSystem
+    {
+        string Name { get; }
+        Tuple<Force, MultiplyPrefix> ForceUnits { get; }
+        Tuple<Pressure, MultiplyPrefix> PressureUnits { get; }
+        Tuple<Length, MultiplyPrefix> LengthUnits { get; }
+        double ConvertLength(double length);
+    }
+}

UnitSystem/Systems/SystemSi.cs

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+using System;
+using StructureHelper.UnitSystem.Enums;
+using StructureHelper.UnitSystem.Systems;
+
+namespace StructureHelper.UnitSystem
+{
+    internal class SystemSi : IUnitSystem
+    {
+        public SystemSi()
+        {
+            LengthUnits = new Tuple<Length, MultiplyPrefix>(Length.M, MultiplyPrefix.m);
+        }
+
+        public string Name => "СИ";
+        public Tuple<Force, MultiplyPrefix> ForceUnits { get; }
+        public Tuple<Pressure, MultiplyPrefix> PressureUnits { get; }
+        public Tuple<Length, MultiplyPrefix> LengthUnits { get; }
+        public double ConvertLength(double length)
+        {
+            switch (LengthUnits.Item2)
+            {
+                case MultiplyPrefix.m:
+                    return length / 1000;
+                default:
+                    throw new ArgumentOutOfRangeException();
+            }
+        }
+    }
+}

UnitSystem/UnitSystemService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using StructureHelper.UnitSystem.Systems;
+
+namespace StructureHelper.UnitSystem
+{
+    public class UnitSystemService
+    {
+        private IUnitSystem currentSystem;
+        public IUnitSystem GetCurrentSystem() => currentSystem;
+        public UnitSystemService()
+        {
+            currentSystem = new SystemSi();
+        }
+    }
+}