Transaction.DependentClone(DependentCloneOption) Metodo

Definizione

Crea un duplicato dipendente della transazione.Creates a dependent clone of the transaction.

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

Parametri

cloneOptionoption
DependentCloneOption

Oggetto DependentCloneOption che controlla il tipo di transazione dipendente da creare.A DependentCloneOption that controls what kind of dependent transaction to create.

Restituisce

DependentTransaction

Oggetto DependentTransaction che rappresenta il duplicato dipendente.A DependentTransaction that represents the dependent clone.

Esempio

Nell'esempio seguente viene illustrato come creare una transazione dipendente.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();
}
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

Commenti

Una transazione dipendente è una transazione il cui risultato dipende dal risultato della transazione dalla quale è stato clonato.A dependent transaction is a transaction whose outcome depends on the outcome of the transaction from which it was cloned.

Il cloneoption parametro controlla il tipo di transazione dipendente da creare.The cloneoption parameter controls what kind of dependent transaction to create. Se una transazione dipendente viene creata con BlockCommitUntilComplete , blocca il processo di commit della transazione fino a quando non si verifica il timeout della transazione o Complete viene chiamato su DependentTransaction .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. Se viene creato con RollbackIfNotComplete , interrompe automaticamente la transazione se Commit viene chiamato prima Complete di chiamare su DependentTransaction .If it is created with RollbackIfNotComplete, it automatically aborts the transaction if Commit is called before Complete is called on the DependentTransaction.

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