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PreparingEnlistment.Prepared Method

Note: This method is new in the .NET Framework version 2.0.

Indicates that the transaction can be committed.

Namespace: System.Transactions
Assembly: System.Transactions (in system.transactions.dll)

public void Prepared ()
public void Prepared ()
public function Prepared ()

In the first (prepare) phase of a two phase commit, a resource manager implementing the Prepare method of the IEnlistmentNotification interface, calls this method to indicate that the transaction can be committed.

The resource manager can call the Done method at anytime before it has called this method. By doing so, the enlistment is casting a read only vote, meaning that it votes commit on the transaction but does not need to receive the final outcome.

Once this method is called by an enlistment and before it returns, it is possible that another thread or this same thread could make a call into the same enlistment method such as Rollback to perform a rollback. This can result in a deadlock situation if the resource manager implementation does not release resource locks until after this method returns.

class myEnlistmentClass : IEnlistmentNotification
{
    public void Prepare(PreparingEnlistment preparingEnlistment)
    {
        Console.WriteLine("Prepare notification received");

        //Perform transactional work

        //If work finished correctly, reply prepared
        preparingEnlistment.Prepared();

        // otherwise, do a ForceRollback
        preparingEnlistment.ForceRollback();
    }

    public void Commit(Enlistment enlistment)
    {
        Console.WriteLine("Commit notification received");

        //Do any work necessary when commit notification is received

        //Declare done on the enlistment
        enlistment.Done();
    }

    public void Rollback(Enlistment enlistment)
    {
        Console.WriteLine("Rollback notification received");

        //Do any work necessary when rollback notification is received

        //Declare done on the enlistment
        enlistment.Done();
    }

    public void InDoubt(Enlistment enlistment)
    {
        Console.WriteLine("In doubt notification received");

        //Do any work necessary when indout notification is received
        
        //Declare done on the enlistment
        enlistment.Done();
    }
}

Windows 98, Windows 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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