PreparingEnlistment.Prepared 方法

定义

命名空间:

System.Transactions

程序集:

System.Transactions.Local.dll

程序集:

System.Transactions.dll

程序集:

netstandard.dll

指示可以提交事务。

public:
 void Prepared();

public void Prepared ();

member this.Prepared : unit -> unit

Public Sub Prepared ()

示例

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

注解

在第一个 (准备两个阶段提交的) 阶段，一个实现 Prepare 接口方法的 IEnlistmentNotification 资源管理器调用此方法以指示可以提交事务。

资源管理器可以在调用此方法之前随时调用 Done 该方法。 通过这样做，登记正在投一个只读投票，这意味着它投票提交交易，但不需要获得最终结果。

一旦此方法由登记调用，并在它返回之前，有可能另一个线程或同一线程可以调用同一登记方法，例如 Rollback 执行回滚。 如果资源管理器实现在此方法返回之前不会释放资源锁，这可能会导致死锁。