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.NET Framework Class Library
Transaction..::.DependentClone Method

Creates a dependent clone of the transaction.

Namespace: System.Transactions
Assembly: System.Transactions (in System.Transactions.dll)
Syntax
Public Function DependentClone ( _
	cloneOption As DependentCloneOption _
) As DependentTransaction
public DependentTransaction DependentClone(
	DependentCloneOption cloneOption
)
public:
DependentTransaction^ DependentClone(
	DependentCloneOption cloneOption
)
member DependentClone : 
        cloneOption:DependentCloneOption -> DependentTransaction 

Parameters

cloneOption
Type: System.Transactions..::.DependentCloneOption
A DependentCloneOption that controls what kind of dependent transaction to create.

Return Value

Type: System.Transactions..::.DependentTransaction
A DependentTransaction that represents the dependent clone.
Remarks

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.

Examples

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


		Public Shared Sub Main()
			Try
				Using scope As TransactionScope = New TransactionScope()

					'Perform transactional work here.

					'Queue work item
					ThreadPool.QueueUserWorkItem(AddressOf 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
					Dim c As ConsoleKeyInfo
					While (True)

						Console.Write("Complete the transaction scope? [Y|N] ")
						c = Console.ReadKey()
						Console.WriteLine()
						If (c.KeyChar = "Y") Or (c.KeyChar = "y") Then
							scope.Complete()
							Exit While
						ElseIf ((c.KeyChar = "N") Or (c.KeyChar = "n")) Then
							Exit While
						End If
					End While
				End Using

			Catch ex As TransactionException
				Console.WriteLine(ex)
			Catch
				Console.WriteLine("Cannot complete transaction")
				Throw
			End Try
		End Sub

		Public Shared Sub WorkerThread(ByVal myTransaction As Object)

			'Create a DependentTransaction from the object passed to the WorkerThread
			Dim dTx As DependentTransaction
			dTx = CType(myTransaction, DependentTransaction)

			'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 ts As TransactionScope = New TransactionScope(dTx)
				'Perform transactional work here.

				'Call complete on the transaction scope
				ts.Complete()
			End Using

			'Call complete on the dependent transaction
			dTx.Complete()
		End Sub


		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();
		}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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