Adf.Business.Messaging.CsvMessageHandler.GetValueForField C# (CSharp) Method

        private static string GetValueForField(FieldDefinition fieldDefinition, IInternalState state)
        {
            string format = fieldDefinition.Format;
            var columnDescriber = new ColumnDescriber(fieldDefinition.Name, fieldDefinition.Table);

            if(fieldDefinition.Type.IsIn(FieldDefinitionType.DateTime))
            {
                var dateTime = state.Get<DateTime?>(columnDescriber);

                if (!dateTime.HasValue)
                    return fieldDefinition.Default;

                // DateTime needs a format specifier
                return !format.IsNullOrEmpty() ? dateTime.Value.ToString(format, CultureInfo.InvariantCulture) : dateTime.Value.ToShortDateString();
            }

            if(fieldDefinition.Type.IsIn(FieldDefinitionType.Amount, FieldDefinitionType.InvertedAmount, FieldDefinitionType.Decimal))
            {
                var money = state.Get<Money>(columnDescriber);

                if (money.IsEmpty) return fieldDefinition.Default;
                if (fieldDefinition.Type == FieldDefinitionType.InvertedAmount) money *= -1;

                return ToString(money, format);
            }

            if(fieldDefinition.Type.IsIn(FieldDefinitionType.Int16, FieldDefinitionType.Int32, FieldDefinitionType.Int64))
            {
                var value = state.Get<long?>(columnDescriber);

                return !value.HasValue ? fieldDefinition.Default : ToString(value, format);
            }

            return !state.Get<string>(columnDescriber).IsNullOrEmpty() ? state.Get<string>(columnDescriber) : fieldDefinition.Default;
        }