Open windows in background

Question

I'm opening a second window in my main window. This window is used to display a progress bar, so I don't want to block my application when it is open.

My code is:

public partial class MainWindow : Window, IDisposable
{
    private void doUpdate(object sender, UpdateInfosArgs e)
    {
        this.Dispatcher.BeginInvoke(new Action(() =>
        {
            using (DownloadingFileWindow dlw = new DownloadingFileWindow())
            {
                dlw.OnDownloadFileComplete += OnDownloadFileComplete;
                this.Dispatcher.BeginInvoke((Action)(() => dlw.ShowDialog()));
                // or dlw.Show();
            }
        }
    }
}

Currently, when the window is shown, it is closed immediately when execution reaches the } of the using.

Is there a way to way that windows is closed?

score 2 · Answer 1 · edited May 23 '17 at 12:00

2

To open a dialog as non-modal (non-blocking) you need to use Show() instead of ShowDialog().

Your second problem is your using statement. This disposes dlw again at the end of the using block, which closes the window.

So try this:

private void doUpdate(object sender, UpdateInfosArgs e)
{
    DownloadingFileWindow dlw = new DownloadingFileWindow();
    dlw.OnDownloadFileComplete += OnDownloadFileComplete;
    dlw.Show();
}

I don't think it's necessary to call Dispose() on the child window explicitly. See this question for a discussion of that.

edited May 23 '17 at 12:00

Community

1
1

answered Mar 23 '17 at 11:16

René Vogt

43,056
14
77
99

You right, my using was disposing my window. Do I have to override `DownloadingFileWindow.OnClose` to properly call the Dispose function ? – A.Pissicat Mar 23 '17 at 11:22
@A.Pissicat added a link to a question discussing the `Dispose()` question – René Vogt Mar 23 '17 at 11:50

kurdy · Answer 2 · 2017-03-23T11:17:55.937

1

The dialog will close after the using, because the using bracket cleans the object after finished the task in the using bracket.

To keep it open after your using bracket, you must not initiate the ressource for the using.

DownloadingFileWindow dlw = new DownloadingFileWindow()
dlw.OnDownloadFileComplete += OnDownloadFileComplete;
this.Dispatcher.BeginInvoke((Action)(() => dlw.ShowDialog()));

And within the Dialog itself, implement a closing routine like this.close(); by a trigger.

edited Mar 23 '17 at 11:17

answered Mar 23 '17 at 11:12

kurdy

441
4
15

It's better without using but ShowDialog always block mainWindows. With `dlw.Show()` it is better – A.Pissicat Mar 23 '17 at 11:20

Open windows in background

2 Answers2