How to show busy indicator before closing window?

[Yu]

Hi,

I have an application that when the user close the window, I'd like to do some time consuming task (update database). At the same time, I want to show busy indicator. When the task is done, close the window as per normal. Here's the sample code

public partial class MainWindow

    {

        public MainWindow()

        {

            InitializeComponent();

            Closing += MainWindowClosing;

        }

 

        void MainWindowClosing(object sender, CancelEventArgs e)

        {

            e.Cancel = true;

            busyIndicator.IsBusy = true;

            var worker = new BackgroundWorker();

            worker.DoWork += (s, args) => Thread.Sleep(TimeSpan.FromSeconds(3));//just for testing


            worker.RunWorkerCompleted += (s, args) =>

                                             {

                                                 busyIndicator.IsBusy = false;

                                                 e.Cancel = false;

                                             };

            worker.RunWorkerAsync();

 

        }

    }

but it's not working. The "e.Cancel = false" doesn't close the window. Can anyone help? Where did I do wrong?

Thanks!

[Yu]

Found the solution. Add in a flag _taskDone. Here it is:

public partial class MainWindow
    {
        public MainWindow()
        {
            InitializeComponent();
            Closing += MainWindowClosing;
        }

        private bool _taskDone = false;

        void MainWindowClosing(object sender, CancelEventArgs e)
        {
            if (!_taskDone)
                e.Cancel = true;
            busyIndicator.IsBusy = true;
            var worker = new BackgroundWorker { WorkerReportsProgress = true };
            worker.DoWork += (s, args) => Thread.Sleep(TimeSpan.FromSeconds(3));
            worker.RunWorkerCompleted += (s, args) =>
                                             {
                                                 _taskDone = true;
                                                 Close();
                                             };
            worker.RunWorkerAsync();
        }
    }

Thanks to this link How to fade in and out a window in WPF Posted by admin in Programming, WPF

[Konstantina]

Hello Yu,

We are glad that you have resolved the issue yourself. Thank you for sharing it.

Greetings,
Konstantina
the Telerik team