DependentClone Method

Transaction.DependentClone Method

Note: This method is new in the .NET Framework version 2.0.

Creates a dependent clone of the transaction.

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

public DependentTransaction DependentClone (
	DependentCloneOption cloneOption
)
public DependentTransaction DependentClone (
	DependentCloneOption cloneOption
)
public function DependentClone (
	cloneOption : DependentCloneOption
) : DependentTransaction

Parameters

cloneOption

A DependentCloneOption that controls what kind of dependent transaction to create.

Return Value

A DependentTransaction that represents the dependent clone.

A dependent transaction is a transaction whose outcome depends on the outcome of the transaction from which it was cloned.

The cloneoption parameter controls what kind of dependent transaction to create. If a dependent transaction is created with BlockCommitUntilComplete, it blocks the commit process of the transaction until the transaction times out, or Complete is called on the DependentTransaction. If it is created with RollbackIfNotComplete, it automatically aborts the transaction if Commit is called before Complete is called on the 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();
}

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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