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();

             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();
        }
     }