.net - 如何从 TPL 任务更新 WPF 控件？

Question

如何从 TPL 任务更新 WPF 控件？

很好，所以我尝试了一些场景来使用 Dispatcher，但无论如何它都给出了错误。我需要帮助!

private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        //Application.Current.Dispatcher.Invoke((Action)MyInit); 
        backgroundDBTask = Task.Factory.StartNew(() =>
            {
                DoSomething1();
            }, TaskCreationOptions.LongRunning);
        backgroundDBTask.ContinueWith((t) =>
        {
            // ... UI update work here ...
        },             
        TaskScheduler.FromCurrentSynchronizationContext());             
    }

    void DoSomething1()
    {
        // MyInit();
        int number = 0;
        while (true)
        {
            if (state)
            {
                Thread.Sleep(1000);
                Console.WriteLine("Begin second task... {0}", number++);
               // mostCommonWords = GetMostCommonWords(words) + string.Format("   Begin second task... {0}", number++);

                textBox2.Text = (number++).ToString(); // Gives the error

                Dispatcher.BeginInvoke(); // How it should be ?
            }
        }
    }

谢谢!

Answer 1

您需要将执行您的工作的委托(delegate)传递给 BeginInvoke。
BeginInvoke 将在 UI 线程上异步运行此委托(delegate)。

例如:

Dispatcher.BeginInvoke(new Action(delegate {
    textBox2.Text = number.ToString(); 
}));