单击按钮时不按住按钮就可以运行C＃的耗时方法

Question

I do have experience with software developping in Python (GUI platform PyQt) and I am learing software development in C#. I wanted to know how can I run a thread/task in C# that uses UI objects but keeping the UI "alive" and not keeping the button pressed. I did used "Invoke" method to share UI objects with thread/task and did not call any join method, but still button remain pressed during thread execution. Is there any way to run this method in background, but keeping the GUI responsive?

Thanks in advance!

---

private async void Button_Click(object sender, RoutedEventArgs e)
{
    await Task.Run(new Action(this.Iterate_balance));

}

private async void Iterate_balance()
{
    this.Dispatcher.Invoke(() =>
    {
        // the rest of code
    }
}

Answer 1

use async/await pattern properly and you won't need Dispatcher at all:

private async void Button_Click(object sender, RoutedEventArgs e)
{
    await Iterate_balance();    
}

private async Task Iterate_balance()
{
    button.Content = "Click to stop";

    // some long async operation
    await Task.Delay(TimeSpan.FromSeconds(4));

    button.Content = "Click to run";
}

Answer 2

TRY THIS:

1.Add following using: using System.ComponentModel;

2.Declare background worker :

private readonly BackgroundWorker worker = new BackgroundWorker();

3.Register events:

worker.DoWork += worker_DoWork;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;

4.Implement two methods:

private void worker_DoWork(object sender, DoWorkEventArgs e)
{
   // run all background tasks here
}

private void worker_RunWorkerCompleted(object sender, 
                                       RunWorkerCompletedEventArgs e)
{
  //update ui once worker complete his work
}

5.Run worker async whenever your need.

worker.RunWorkerAsync();

Also if you want to report process progress you should subscribe to ProgressChanged event and use ReportProgress(Int32) in DoWork method to raise an event. Also set following: worker.WorkerReportsProgress = true;

Hope this help.