How to call a parent window method when another daughter window is closed with WPF

Question

Hello, I’m starting to work with WPF and my situation is as follows:

• I have a Mainwindow screen, which persists the application.
• The Mainwindow calls a new screen Regradetailsdialog in a certain function.
• Once a process is executed that closes the screen Rewrite SDIALOG need to update the Mainwindow.

In Mainwindow, the method that calls Regradetailsdialog is below:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;
    }

    private void AddRegra(object sender, RoutedEventArgs e)
    {
        RegraDetailsDialog rdd = new RegraDetailsDialog();
        rdd.Show();
    }
    private void AtualizaTela(object sender, RoutedEventArgs e)
    {
        MessageBox.Show("teste");
    }
}

How do I, as soon as the Regradetailsdialog is closed, call the method AtualizaTela in Mainwindow?

Answer 1

If you call the method Showdialog() that opens a window and returns only when the newly opened window is closed, and of course call right after the method, example:

private void AddRegra(object sender, RoutedEventArgs e)
{
    RegraDetailsDialog rdd = new RegraDetailsDialog();
    rdd.ShowDialog(); 
    AtualizaTela();
}
private void AtualizaTela()
{
    MessageBox.Show("teste");
}

only the AtualizaTela when the rdd is closed.

_Reference:

• Window Method.Showdialog()
• WPF Dialogs and Dialogresult

Answer 2

In your XAML of the window Regradetailsdialog you can put

<Window...Closing="Window_Closing" Closed="Window_Closed">

</Window>

In the class put the code below to call Mainwindow class methods.

private void Window_Closed(object sender, EventArgs e)
{
     (Application.Current.MainWindow as MainWindow).AtualizaTela();
}