Enlistment Class

Definition

Namespace:

System.Transactions

Assembly:

System.Transactions.Local.dll

Source:

Enlistment.cs

Facilitates communication between an enlisted transaction participant and the transaction manager during the final phase of the transaction.

public ref class Enlistment

public class Enlistment

type Enlistment = class

Public Class Enlistment

Inheritance

Object

Enlistment

Derived

System.Transactions.PreparingEnlistment

System.Transactions.SinglePhaseEnlistment

Examples

The following example shows an implementation of the IEnlistmentNotification interface, and when the Done method should be called.

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();
    }
}

Public Class EnlistmentClass
    Implements IEnlistmentNotification

    Public Sub Prepare(ByVal myPreparingEnlistment As PreparingEnlistment) Implements System.Transactions.IEnlistmentNotification.Prepare
        Console.WriteLine("Prepare notification received")

        'Perform transactional work

        'If work finished correctly, reply with prepared
        myPreparingEnlistment.Prepared()
    End Sub

    Public Sub Commit(ByVal myEnlistment As Enlistment) Implements System.Transactions.IEnlistmentNotification.Commit
        Console.WriteLine("Commit notification received")

        'Do any work necessary when commit notification is received

        'Declare done on the enlistment
        myEnlistment.Done()
    End Sub

    Public Sub Rollback(ByVal myEnlistment As Enlistment) Implements System.Transactions.IEnlistmentNotification.Rollback
        Console.WriteLine("Rollback notification received")

        'Do any work necessary when rollback notification is received

        'Declare done on the enlistment
        myEnlistment.Done()
    End Sub

    Public Sub InDoubt(ByVal myEnlistment As Enlistment) Implements System.Transactions.IEnlistmentNotification.InDoubt
        Console.WriteLine("In doubt notification received")

        'Do any work necessary when indout notification is received

        'Declare done on the enlistment
        myEnlistment.Done()
    End Sub
End Class

Remarks

When the EnlistVolatile and EnlistDurable methods of the Transaction object are invoked to enlist a participant in a transaction, they return this object describing the enlistment.

During the final phase of the transaction commit, the transaction manager passes this object to a resource manager implementing the IEnlistmentNotification interface that has enlisted in a transaction. Specifically, the transaction manager calls either the Commit or the Rollback method of the participant, depending on whether the latter has decided to commit or roll back the transaction. The participant should call the Done method of this object to let the transaction manager know that it has completed its work.

An enlistment can call the Done method at anytime before it has called Prepared in the prepare phase. 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. Note that, after the Done method is called, the enlisted participant receives no further notifications from the transaction manager.

Methods

Done()	Indicates that the transaction participant has completed its work.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Thread Safety

This type is thread safe.

See also

• PreparingEnlistment
• IEnlistmentNotification
• Enlisting Resources As Participants In A Transaction