The ObjectMapper .NET Project

The NoOpenTransactionException will always be thrown if a Save-Method is called without opening a Transaction first.

        [Test]

        [ExpectedException(typeof(NoOpenTransactionException))]

        public void TestNoOpenTransactionException()

        {

            Buying buying = new Buying(5, "Hotdogs");

            using (AdFactum.Data.ObjectMapper mapper = OBM.CreateMapper(Connection))

            {

                // A NoOpenTransactionException will be thrown, because no transaction has been opened.

                mapper.Save(buying);

            }

        }

To prevent this exception you have to call the BeginTransaction Method. It’s recommended to use the BeginTransaction of the OBM Helper class in order to handle nested transactions.

                nested = OBM.BeginTransaction(mapper);

                mapper.Save(buying);
                OBM.Commit(mapper, nested);