DependentCloneOption Enumeration

DependentCloneOption Enumeration

 

Controls what kind of dependent transaction to create.

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

Public Enumeration 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.

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

.NET Framework
Available since 2.0

System.Transactions Namespace
Managing Concurrency with DependentTransaction

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