暂停新的 BackGroundWorker 直到前一个完成

我正在努力解决线程问题。 问题是当我迭代 foreach 循环时。

设置时this.Document，应用程序执行登录，这是由事件触发的，需要几秒钟才能完成。在里面worker_RunWorkerCompleted方法 我需要执行一些取决于当前登录信息的操作。

问题是，在我对第一个文件执行此操作之前，this.Document已经发生更改，使应用程序执行另一次登录。这样我就永远无法真正执行我的行动。

我的问题是：如何暂停下一个线程，直到上一个线程完成。 我的问题还有其他解决方案吗？

我尝试过AutoResetEvent但我没有运气。我设置waitOne()就在 RunWorkerAsync 调用之后.Set()在 RunWorkerCompleted 中。代码永远不会到达RunWorkerCompleted...

这是代码：

    public void Start(object obj)
    {
       try
       {
          foreach (KeyValuePair<string, Stream> pair in this.CollectionOfFiles)
          {
              Worker = new BackgroundWorker();
              Worker.DoWork += new DoWorkEventHandler(worker_DoWork);
              Worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);

          using (Stream stream = pair.Value)
              {
                primaryDocument = new Document(stream);

                DataHolderClass dataHolder = new DataHolderClass();
                dataHolder.FileName = pair.Key;
                dataHolder.Doc = secondaryDocument;

               //background thread call
                Worker.RunWorkerAsync(dataHolder);
              }
            }
          }

       catch (Exception ex)
       {
          // exception logic
}
       finally
       {
          // complete logic
       }
    }


    private void worker_DoWork(object sender, DoWorkEventArgs e)
    {
       DataHolderClass dataHolder = ((DataHolderClass)e.Argument);
       // setting this attribute triggers execution of login event
       this.Document = dataHolder.Doc;
       e.Result = (dataHolder);
    }


    private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
       // here I need to perform some actions that are depending on the current login
       DataHolderClass dataHolder = ((DataHolderClass)e.Result);
       this.eventAggregator.GetEvent<ActionEvent>().Publish(new Message(EMessageType.Info) { Title = dataHolder.FileName });
    }

no9,

请尝试以下操作：

System.Threading.ManualResetEvent _busy = new System.Threading.ManualResetEvent(false);

void ResumeWorker() 
{
     // Start the worker if it isn't running
     if (!backgroundWorker1.IsBusy) backgroundWorker1.RunWorkerAsync(dataHolder);  
     // Unblock the worker 
     _busy.Set();
}

void PauseWorker() 
{
    // Block the worker
    _busy.Reset();
}

void CancelWorker() 
{
    if (backgroundWorker1.IsBusy) {
        // Set CancellationPending property to true
        backgroundWorker1.CancelAsync();
        // Unblock worker so it can see that
        _busy.Set();
    }
}

然后在您的代码中运行该方法。

让我知道它是否有效:)