C# Transaction 事务处理 -依赖事务

 在DependentTransaction（）方法中，实例化CommittableTransaction类，创建一个根事务，显示事务的信息。接着， tx.DependentClone（）方法创建一个依赖的事务。把这个依赖事务传递给TxTask（）方法，它定义为新任务的入口。

static void DependentTransaction()
        {
            var tx = new CommittableTransaction();
            Utilities.DisplayTransactionInformation("Root TX created",
                  tx.TransactionInformation);

            try
            {
                Task.Factory.StartNew(TxTask, tx.DependentClone(DependentCloneOption.BlockCommitUntilComplete));

                if (Utilities.AbortTx())
                {
                    throw new ApplicationException("transaction abort");
                }

                tx.Commit();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                tx.Rollback();
            }

            Utilities.DisplayTransactionInformation("TX finished",
                  tx.TransactionInformation);

        }

        static void TxTask(object obj)
        {
            var tx = obj as DependentTransaction;
            Utilities.DisplayTransactionInformation("Dependent Transaction",
                  tx.TransactionInformation);

            Thread.Sleep(3000);

            tx.Complete();

            Utilities.DisplayTransactionInformation("Dependent TX Complete",
                  tx.TransactionInformation);
        }

   public static class Utilities
    {
       public static void DisplayTransactionInformation(string title, TransactionInformation ti)
       {
           Contract.Requires<ArgumentNullException>(ti != null);

           Console.WriteLine(title);
           Console.WriteLine("Creation Time: {0:T}", ti.CreationTime);
           Console.WriteLine("Status: {0}", ti.Status);
           Console.WriteLine("Local ID: {0}", ti.LocalIdentifier);
           Console.WriteLine("Distributed ID: {0}", ti.DistributedIdentifier);
           Console.WriteLine();
       }
    }