BExIS.Dlm.Services.DataStructure.UnitManager.CreateConversionMethod C# (CSharp) Метод

        public ConversionMethod CreateConversionMethod(string formula, string description, Unit source, Unit target)
        {
            Contract.Requires(!string.IsNullOrWhiteSpace(formula), "formula can not be empty");
            Contract.Requires(formula.Contains("s"), "Formula must use \'s\' as the representative for the source unit");
            Contract.Requires(source != null, "source unit can not be null");
            Contract.Requires(source.Id >= 0, "source unit must be persisted before this call");
            Contract.Requires(target != null, "target unit can not be null");
            Contract.Requires(target.Id >= 0, "target unit must be persisted before this call");

            Contract.Ensures(Contract.Result<ConversionMethod>() != null && Contract.Result<ConversionMethod>().Id >= 0, "No Conversion Method persisted!");

            ConversionMethod cm = new ConversionMethod()
            {
                Formula = formula,
                Description = description,
                Source = source,
                Target = target,
            };

            source.ConversionsIamTheSource.Add(cm);
            target.ConversionsIamTheTarget.Add(cm);

            using (IUnitOfWork uow = this.GetUnitOfWork())
            {
                IRepository<ConversionMethod> repoCM = uow.GetRepository<ConversionMethod>();
                ConversionMethod temp = repoCM.Get(c => c.Source.Id == source.Id && c.Target.Id == target.Id).FirstOrDefault(); // change it to Count instead of Get
                if (temp != null)
                    throw new Exception(string.Format("There is already a conversion method between {0} and {1} having [{2}] formula", cm.Source.Name, cm.Target.Name, cm.Formula));
                repoCM.Put(cm);
                uow.Commit();
            }
            return (cm);
        }

        private void Add2UnitsAnd1ConversionUsingAPI()
        {
            UnitManager um = new UnitManager();
            Unit km = um.Create("Kilometer", "Km", "This is the Kilometer", null, MeasurementSystem.Metric);// null dimension should be replaced
            Unit m = um.Create("Meter", "M", "This is the Meter", null, MeasurementSystem.Metric);// null dimension should be replaced
            Unit cm = um.Create("Centimeter", "Cm", "This is the CentiMeter which is equal to 0.01 Meter", null, MeasurementSystem.Metric);
            ConversionMethod cm1 = um.CreateConversionMethod("s*100", "Converts meter to centi meter", m, cm);
            ConversionMethod cm2 = um.CreateConversionMethod("s*1000", "Converts kilometer to meter", km, m);
            ConversionMethod cm3 = um.CreateConversionMethod("s/1000", "Converts meter to kilometer", m, km);
            ConversionMethod cm4 = um.CreateConversionMethod("s/100", "Converts centimeter to meter", cm, m);

            km.Description += "Updated";
            cm1.Description += "Updated";
            km.ConversionsIamTheSource.Clear(); //??
            um.Update(km);
            um.UpdateConversionMethod(cm1);

            // Works fine: 24.07.12, Javad
            //DataTypeManager dtManager = new DataTypeManager();
            //DataType deci = dtManager.Create("Decimal", "A decimal data type", TypeCode.Int16);
            //um.AddAssociatedDataType(m, deci);
            //um.RemoveAssociatedDataType(m, deci);

            um.DeleteConversionMethod(cm1);
            um.DeleteConversionMethod(new List<ConversionMethod>() { cm2, cm3 });

            um.Delete(cm);
            um.Delete(new List<Unit>() { km, m });
        }