Question

我正在使用BackGroundWorker来传输backgorund中的文本文件。

当这个完成时，我想同时运行两个Tasks，这涉及两个重度计算的方法。这些方法使用流数据进行计算。

不知怎的，我被困住了。第一部分执行，我能够流式传输数据。但涉及计算的第二部分不会执行。

private readonly BackgroundWorker _streamworker = new BackgroundWorker();

public MainWindow()
{
    InitializeComponent();

    _streamworker.WorkerReportsProgress = true;
    _streamworker.WorkerSupportsCancellation = true;

    _streamworker.DoWork += StreamData;
    _streamworker.RunWorkerCompleted += worker_RunWorkerCompleted;
    _streamworker.RunWorkerAsync();
}

private void StreamData(object sender, DoWorkEventArgs e)
{
    // Stream a Text file here
}

private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    var task1 = Task.Factory.StartNew(HeavyMethod1);
    var task2 = Task.Factory.StartNew(HeavyMethod2);

    Task.WaitAll();

    // After the calculations have ended
    // Do something with the calculate results here
}

private void HeavyMethod1()
{
    // Some heavy calculations
}
private void HeavyMethod2()
{
    // Some heavy calculations that are not 
    // related to the ones in HeavyMethod1
}

更新我注意到的一个非常奇怪的事情是，如果我在计算之前放置MessageBox.Show("");一切正常！

private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    var task1 = Task.Factory.StartNew(HeavyMethod1);
    var task2 = Task.Factory.StartNew(HeavyMethod2);

    Task.WaitAll();
    MessageBox.Show("");

    // After the calculations have ended
    // Do something with the calculate results here
}

Answer 1

你不要等待任何事情。只需使用task1和task2

即可

Task.WaitAll(new Task[]{task1, task2});

<强>更新

使用MessageBox，您可以完成任务以完成其工作。

BackgroundWorker完成后运行同步任务

1 个答案: