DependentCloneOption Enumeration

 

Controls what kind of dependent transaction to create.

Namespace:   System.Transactions
Assembly:  System.Transactions (in System.Transactions.dll)

public enum DependentCloneOption

Member nameDescription
BlockCommitUntilComplete

The dependent transaction blocks the commit process of the transaction until the parent transaction times out, or Complete is called. In this case, additional work can be done on the transaction and new enlistments can be created.

RollbackIfNotComplete

The dependent transaction automatically aborts the transaction if Commit is called on the parent transaction before Complete is called.

A dependent transaction can be obtained using the DependentClone method, with the DependentCloneOption parameter controlling what kind of dependent transaction to create. For more information on how this enumeration is used, see Managing Concurrency with DependentTransaction.

The following example shows you how to create a dependent transaction.

static void Main(string[] args)
{
	try
	{
		using (TransactionScope scope = new TransactionScope())
		{
			// Perform transactional work here.

			//Queue work item
			ThreadPool.QueueUserWorkItem(new WaitCallback(WorkerThread), Transaction.Current.DependentClone(DependentCloneOption.BlockCommitUntilComplete));

			//Display transaction information
			Console.WriteLine("Transaction information:");
			Console.WriteLine("ID:             {0}", Transaction.Current.TransactionInformation.LocalIdentifier);
			Console.WriteLine("status:         {0}", Transaction.Current.TransactionInformation.Status);
			Console.WriteLine("isolationlevel: {0}", Transaction.Current.IsolationLevel);

			//Call Complete on the TransactionScope based on console input
			ConsoleKeyInfo c;
			while (true)
			{
                      			Console.Write("Complete the transaction scope? [Y|N] ");
				c = Console.ReadKey();
				Console.WriteLine();

				if ((c.KeyChar == 'Y') || (c.KeyChar == 'y'))
				{
					//Call complete on the scope
					scope.Complete();
					break;
				}
				else if ((c.KeyChar == 'N') || (c.KeyChar == 'n'))
				{
					break;
				}
			}

		}
	}
	catch (System.Transactions.TransactionException ex)
	{
		Console.WriteLine(ex);
	}
	catch
	{
		Console.WriteLine("Cannot complete transaction");
		throw;
	}

}

private static void WorkerThread(object transaction)
{
	//Create a DependentTransaction from the object passed to the WorkerThread
	DependentTransaction dTx = (DependentTransaction)transaction;

	//Sleep for 1 second to force the worker thread to delay
	Thread.Sleep(1000);

	//Pass the DependentTransaction to the scope, so that work done in the scope becomes part of the transaction passed to the worker thread
	using (TransactionScope ts = new TransactionScope(dTx))
	{
		//Perform transactional work here.

		//Call complete on the transaction scope
		ts.Complete();
	}

	//Call complete on the dependent transaction
	dTx.Complete();
}

.NET Framework
Available since 2.0

System.Transactions Namespace
Managing Concurrency with DependentTransaction

Return to top
Show: