c# - meilleure façon de vérifier si la fenêtre a obtenu effectivement fermé - Stack Overflow

I would like to know if there is a better way than the following to check if the window got closed, or if a Closing cancled the closing procedure?

Here we go with my way:

var window = Application.Current.Windows.FirstOrDefault(x => x is FooWindow);
if (window != null)
{
    var gotClosed = false;
    window.Closed += (sender, args) => gotClosed = true;
    window.Close();
    if (gotClosed == false)
    {
        //Close got cancled, by closing...
    }
}

I'm not sure it's better than your solution, but after calling window.Close() the property IsDisposed gets true. So, you can check it:

if(window.IsDisposed) { .... }

From checking the .NET source, I'm not too sure that IsDisposed is safe. There don't seem to be a lot of safe options though. The one I have been using so far without issues is checking the Visibility property for Visible after closing.

A cleaner approach might be creating your own class and overriding OnClosing() or OnClosed() though:

protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
    // Fires Closing event
    base.OnClosing(e);

    if (!e.Cancel)
    {
        // Window was allowed to close.
        // Set IsClosed = true or something like that
    }
}

There you can store the result in a property for example.

I would like to know if there is a better way than the following to check if the window got closed, or if a Closing cancled the closing procedure?

Here we go with my way:

var window = Application.Current.Windows.FirstOrDefault(x => x is FooWindow);
if (window != null)
{
    var gotClosed = false;
    window.Closed += (sender, args) => gotClosed = true;
    window.Close();
    if (gotClosed == false)
    {
        //Close got cancled, by closing...
    }
}

I'm not sure it's better than your solution, but after calling window.Close() the property IsDisposed gets true. So, you can check it:

if(window.IsDisposed) { .... }

From checking the .NET source, I'm not too sure that IsDisposed is safe. There don't seem to be a lot of safe options though. The one I have been using so far without issues is checking the Visibility property for Visible after closing.

A cleaner approach might be creating your own class and overriding OnClosing() or OnClosed() though:

protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
    // Fires Closing event
    base.OnClosing(e);

    if (!e.Cancel)
    {
        // Window was allowed to close.
        // Set IsClosed = true or something like that
    }
}

There you can store the result in a property for example.

Source