Transaction.TransactionCompleted Událost

Definice

Obor názvů:

System.Transactions

Sestavení:

System.Transactions.Local.dll

Zdroj:

Transaction.cs

Označuje, že transakce byla dokončena.

public:
 event System::Transactions::TransactionCompletedEventHandler ^ TransactionCompleted;

public event System.Transactions.TransactionCompletedEventHandler? TransactionCompleted;

member this.TransactionCompleted : System.Transactions.TransactionCompletedEventHandler 

Public Custom Event TransactionCompleted As TransactionCompletedEventHandler 

Event Type

TransactionCompletedEventHandler

Výjimky

ObjectDisposedException

Pokus o přihlášení k odběru této události u transakce, která byla odstraněna.

Příklady

Následující příklad ukazuje, jak aplikace může získat výsledek transakce přihlášením k odběru TransactionCompleted události.

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

Poznámky

Můžete se zaregistrovat pro tuto událost místo použití nestálé zařazení k získání informací o výsledku transakcí. Parametr předaný delegátu TransactionCompletedEventHandlerTransaction je instance. Potom můžete dotazovat TransactionInformation vlastnost konkrétní instance a získat instanci TransactionInformation, jejíž Status vlastnost obsahuje stav transakce s Committed hodnotou nebo Aborted .

Pozor Registrace k této události negativně ovlivňuje výkon transakce, ke které je připojena.