Transaction.TransactionCompleted Evento

Definição

Indica que a transação está concluída.Indicates that the transaction is completed.

public:
 event System::Transactions::TransactionCompletedEventHandler ^ TransactionCompleted;
public event System.Transactions.TransactionCompletedEventHandler TransactionCompleted;
member this.TransactionCompleted : System.Transactions.TransactionCompletedEventHandler 
Public Custom Event TransactionCompleted As TransactionCompletedEventHandler 

Exceções

Uma tentativa de assinar esse evento em uma transação que foi descartada.An attempt to subscribe this event on a transaction that has been disposed.

Exemplos

O exemplo a seguir mostra como um aplicativo pode obter o resultado de uma transação assinando o TransactionCompleted evento.The following sample shows how an application can obtain the outcome of a transaction by subscribing to the TransactionCompleted event.

static void Main(string[] args)
{
    try
    {
        //Create the transaction scope
        using (TransactionScope scope = new TransactionScope())
        {
            //Register for the transaction completed event for the current transaction
            Transaction.Current.TransactionCompleted += new TransactionCompletedEventHandler(Current_TransactionCompleted);

            //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'))
                {
                    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;
    }
}

//Transaction completed event handler
static void Current_TransactionCompleted(object sender, TransactionEventArgs e)
{
    Console.WriteLine("A transaction has completed:");
    Console.WriteLine("ID:             {0}", e.Transaction.TransactionInformation.LocalIdentifier);
    Console.WriteLine("Distributed ID: {0}", e.Transaction.TransactionInformation.DistributedIdentifier);
    Console.WriteLine("Status:         {0}", e.Transaction.TransactionInformation.Status);
    Console.WriteLine("IsolationLevel: {0}", e.Transaction.IsolationLevel);
}
Public Shared Sub Main()
    Try
        Using scope As TransactionScope = New TransactionScope()

            'Register for the transaction completed event for the current transaction
            AddHandler Transaction.Current.TransactionCompleted, AddressOf Current_TransactionCompleted

            'Perform transactional work here.

            '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

'Transaction completed event handler
Private Shared Sub Current_TransactionCompleted(ByVal sender As Object, ByVal e As TransactionEventArgs)
    Console.WriteLine("A transaction has completed:")
    Console.WriteLine("ID:             {0}", e.Transaction.TransactionInformation.LocalIdentifier)
    Console.WriteLine("Distributed ID: {0}", e.Transaction.TransactionInformation.DistributedIdentifier)
    Console.WriteLine("Status:         {0}", e.Transaction.TransactionInformation.Status)
    Console.WriteLine("IsolationLevel: {0}", e.Transaction.IsolationLevel)
End Sub

Comentários

Você pode se registrar para esse evento em vez de usar uma inscrição volátil para obter informações de resultado para transações.You can register for this event instead of using a volatile enlistment to get outcome information for transactions. O parâmetro passado para o TransactionCompletedEventHandler delegado é uma Transaction instância.The parameter passed to the TransactionCompletedEventHandler delegate is a Transaction instance. Em seguida, você pode TransactionInformation consultar a propriedade da instância específica para obter uma instância TransactionInformationdo, Status cuja propriedade contém o status de uma transação com o Committed valor Aborted ou.You can then query the TransactionInformation property of the specific instance to get an instance of TransactionInformation, whose Status property contains the status of a transaction with either the Committed or Aborted value.

Cuidado A inscrição nesse evento afeta negativamente o desempenho da transação à qual ele está anexado.Caution Signing up for this event negatively affects the performance of the transaction it is attached to.

Aplica-se a