DependentCloneOption Enumeration
.NET Framework 3.0
Controls what kind of dependent transaction to create.
Namespace: System.Transactions
Assembly: System.Transactions (in system.transactions.dll)
Assembly: System.Transactions (in system.transactions.dll)
| Member name | Description | |
|---|---|---|
| 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 Manage Concurrency with DepedentTransaction.
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
Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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