Transaction.DependentClone(DependentCloneOption) Metodo
Importante
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Crea un duplicato dipendente della transazione.
public:
System::Transactions::DependentTransaction ^ DependentClone(System::Transactions::DependentCloneOption cloneOption);
public:
System::Transactions::DependentTransaction ^ DependentClone(System::Transactions::DependentCloneOption option);
public System.Transactions.DependentTransaction DependentClone (System.Transactions.DependentCloneOption cloneOption);
public System.Transactions.DependentTransaction DependentClone (System.Transactions.DependentCloneOption option);
member this.DependentClone : System.Transactions.DependentCloneOption -> System.Transactions.DependentTransaction
member this.DependentClone : System.Transactions.DependentCloneOption -> System.Transactions.DependentTransaction
Public Function DependentClone (cloneOption As DependentCloneOption) As DependentTransaction
Public Function DependentClone (option As DependentCloneOption) As DependentTransaction
- cloneOptionoption
- DependentCloneOption
Oggetto DependentCloneOption che controlla il tipo di transazione dipendente da creare.
Oggetto DependentTransaction che rappresenta il duplicato dipendente.
Nell'esempio seguente viene illustrato come creare una transazione dipendente.
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();
}
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
Una transazione dipendente è una transazione il cui risultato dipende dal risultato della transazione da cui è stato clonato.
Il cloneoption
parametro controlla il tipo di transazione dipendente da creare. Se viene creata una transazione dipendente con BlockCommitUntilComplete, blocca il processo di commit della transazione fino al timeout della transazione o Complete viene chiamato su DependentTransaction. Se viene creato con RollbackIfNotComplete, interrompe automaticamente la transazione se Commit viene chiamata prima Complete di essere chiamata su DependentTransaction.