当后台工作人员完成时，我如何才能获得返回值

我想使用这个方法:

public static bool SynchronizeFiles(string source, string destination)

在BackgroundWorker。我定义了BackgroundWorker并把它加入到workerList中。那就一个接一个地做。

private void CopyIfIsReady(Save save)
{
    if (save.isDriveReady && save.isFileChanged && save.isPeriodCompleted)
    {
        BackgroundWorker BW = new BackgroundWorker();
        BW.DoWork += (obj, e) => backgroundWorker1_DoWork(save);
        BW.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;
        workerList.Add(BW);
        BW_timer.Start(500);
    }
}
private void BWTimerCallBack(object state)
{
    if (workerList.Count >= 0)
    {
        if(!workerList[0].IsBusy)
        {
            workerList[0].RunWorkerAsync();
        }
    }
    else
    {
        BW_timer.Stop();
    }
}
private void backgroundWorker1_DoWork(Save save)
{
    SynchronizeFiles(save.sourceFolder, save.destFolder);
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
     workerList.RemoveAt(0);
}

但是如何在backgroundWorker1_RunWorkerCompleted中获取SynchronizeFiles的返回值

BW.DoWork += (obj, e) => { e.Result = SynchronizeFiles(save.sourceFolder, save.destFolder); }