Question

我正在尝试确定交易是否已经完成，并且根据结果，我想在另一个线程中做其他事情。

考虑以下TransactionScope：

public class Contact{
    public String name;
    public String email;
    public Contact(String name,String email){
        this.name=name;
        this.email=email;
    }
    public boolean contains(String str){
        return name.contains(str)|| email.contains(str);
    }
    @Override
    public String toString() {
        return name+"\n"+email;
    }
}

现在，在另一个类中，在一个单独的线程中，我将浏览具有类似事务的对象列表：

using (TransactionScope scope = new TransactionScope())
{
    // Do stuff

    Scope.Complete();
}

当我在构造函数中创建一个新动作时，我为一个动作设置了CurrentTransaction：

private static void ProcessActions()
{
    while(true)
    {
        action = pendingActions[0];
        if (action.CurrentTransaction == null || 
            action.CurrentTransaction.TransactionInformation.Status == TransactionStatus.Committed)
        {
            // Proceed to do things!!
            remove = true;
        }
        else if (action.CurrentTransaction.TransactionInformation.Status == TransactionStatus.Aborted)
        {
            // Transaction has aborted. Remove this action from the list
            remove = true;
        }

        if (remove)
        {
            lock (pendingActions)
            {
                pendingActions.Remove(action);
                eventCount = pendingActions.Count;
            }
        }
    }
}

问题是，当其他线程正在处理动作时，处理action.CurrentTransaction，抛出System.ObjectDisposedException。

如何在处置之前跟踪每个事务的状态？

Answer 1

我相信我已经使用Transaction.TransactionCompleted Event找到了解决方案。

我使用以下代码将委托分配给TransactionCompleted事件：

System.Transactions.Transaction.Current.TransactionCompleted += new TransactionCompletedEventHandler(Mother.Current_TransactionCompleted);

在该方法中，我能够遍历我的操作并确定哪一个具有相应的原始事务。像这样：

public static void Current_TransactionCompleted(object sender, TransactionEventArgs e)
{
    var originatingTransaction = sender as System.Transactions.Transaction;

    lock (pendingActions)
    {
        for (int i = pendingActions.Count - 1; i >= 0; i--)
        {
            var action = pendingActions[i];

            if (originatingTransaction.Equals(action.CurrentTransaction))
            {
                var transactionStatus = e.Transaction.TransactionInformation.Status;
                if (transactionStatus == TransactionStatus.Committed)
                {
                    // Later in the code, I will do stuff if CurrentTransaction is null
                    action.CurrentTransaction = null;
                }
                else if (transactionStatus == TransactionStatus.Aborted)
                {
                    // if It's aborted, I will remove this action
                    pendingActions.RemoveAt(i);
                }
                // I will skip processing any actions that still have a Transaction with the status of "Processing"
            }
        }
    }
}

处置后确定交易状态

1 个答案: