Display progress bar while doing some work in C#?

Question

I want to display a progress bar while doing some work, but that would hang the UI and the progress bar won\'t update.

I have a WinForm ProgressForm with a Pro

Answer 1

We are use modal form with BackgroundWorker for such a thing.

Here is quick solution:

  public class ProgressWorker : BackgroundWorker where TArgument : class 
    {
        public Action Action { get; set; }

        protected override void OnDoWork(DoWorkEventArgs e)
        {
            if (Action!=null)
            {
                Action(e.Argument as TArgument);
            }
        }
    }


public sealed partial class ProgressDlg : Form where TArgument : class
{
    private readonly Action action;

    public Exception Error { get; set; }

    public ProgressDlg(Action action)
    {
        if (action == null) throw new ArgumentNullException("action");
        this.action = action;
        //InitializeComponent();
        //MaximumSize = Size;
        MaximizeBox = false;
        Closing += new System.ComponentModel.CancelEventHandler(ProgressDlg_Closing);
    }
    public string NotificationText
    {
        set
        {
            if (value!=null)
            {
                Invoke(new Action(s => Text = value));  
            }

        }
    }
    void ProgressDlg_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
        FormClosingEventArgs args = (FormClosingEventArgs)e;
        if (args.CloseReason == CloseReason.UserClosing)
        {
            e.Cancel = true;
        }
    }



    private void ProgressDlg_Load(object sender, EventArgs e)
    {

    }

    public void RunWorker(TArgument argument)
    {
        System.Windows.Forms.Application.DoEvents();
        using (var worker = new ProgressWorker {Action = action})
        {
            worker.RunWorkerAsync();
            worker.RunWorkerCompleted += worker_RunWorkerCompleted;                
            ShowDialog();
        }
    }

    void worker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
    {
        if (e.Error != null)
        {
            Error = e.Error;
            DialogResult = DialogResult.Abort;
            return;
        }

        DialogResult = DialogResult.OK;
    }
}

And how we use it:

var dlg = new ProgressDlg(obj =>
                                  {
                                     //DoWork()
                                     Thread.Sleep(10000);
                                     MessageBox.Show("Background task completed "obj);
                                   });
dlg.RunWorker("SampleValue");
if (dlg.Error != null)
{
  MessageBox.Show(dlg.Error.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
dlg.Dispose();