TransactionFactory for ambient transactions

transactionfactory.cs

    public class TransactionFactory : ITransactionFactory
    {
        public ITransaction BeginTransaction(TransactionScopeOption option = TransactionScopeOption.Required, IsolationLevel isolationLevel = IsolationLevel.Unspecified)
        {
            var currentTransaction = System.Transactions.Transaction.Current;
            if (currentTransaction != null && option == TransactionScopeOption.Required)
            {
                if (isolationLevel == IsolationLevel.Unspecified || currentTransaction.IsolationLevel == isolationLevel)
                    isolationLevel = currentTransaction.IsolationLevel;
                else
                    throw new TransactionException(
                        $"Kan ikke starte ny transaksjon med isolationlevel {isolationLevel} fordi den er nøstet inn i en eksisterende transaksjon med annet isolationlevel {currentTransaction.IsolationLevel}");
            }
            else
                if(isolationLevel == IsolationLevel.Unspecified)
                    isolationLevel = IsolationLevel.ReadCommitted;
            return new Transaction(option, isolationLevel);
        }

        /// <summary>
        ///     Wrapper rundt TransactionScope for å kunne mocke transactions.
        /// </summary>
        public class Transaction : ITransaction
        {
            private readonly TransactionScope transactionScope;

            public Transaction(TransactionScopeOption scopeOption, IsolationLevel isolationLevel)
            {
                var transactionOptions = new TransactionOptions {
                    IsolationLevel = isolationLevel,
                    Timeout = TransactionManager.MaximumTimeout
                };
                transactionScope = new TransactionScope(scopeOption, transactionOptions, TransactionScopeAsyncFlowOption.Enabled);
            }

            public void Dispose()
            {
                transactionScope.Dispose();
            }

            public void Complete()
            {
                transactionScope.Complete();
            }
        }
    }