Smart rounding was ajusted

StructureHelperCommon/Services/Units/GetUnitLogic.cs

@@ -0,0 +1,50 @@
+using StructureHelperCommon.Infrastructures.Enums;
+using StructureHelperCommon.Infrastructures.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Services.Units
+{
+    public class GetUnitLogic : IGetUnitLogic
+    {
+        private static IEnumerable<IUnit> units = UnitsFactory.GetUnitCollection();
+        private Dictionary<UnitTypes, string> defaultUnitNames;
+
+
+        public GetUnitLogic()
+        {
+            defaultUnitNames = new()
+            {
+                { UnitTypes.Length, "m"},
+                { UnitTypes.Area, "m2"},
+                { UnitTypes.Force, "kN" },
+                { UnitTypes.Moment, "kNm"},
+                { UnitTypes.Stress, "MPa"},
+                { UnitTypes.Curvature, "1/m"},
+            };
+        }
+
+        public IUnit GetUnit(UnitTypes unitType, string unitName = null)
+        {
+            if (unitName is null)
+            {
+                var boolResult = defaultUnitNames.TryGetValue(unitType, out unitName);
+                if (boolResult == false)
+                {
+                    throw new StructureHelperException(ErrorStrings.DataIsInCorrect + $": unit type{unitType} is unknown");
+                }
+            }
+            return units
+                .Where(u =>
+                u.UnitType == unitType
+                &
+                u.Name == unitName)
+                .Single();
+        }
+
+
+    }
+}