Question

There is a button btn_Edit in a window. When that button clicked, a new window opens (new_win) and a click event is added to a button (btn_OK) on new_win. It seems that btn_OK_Click does not work because new_win does not close. Where is the problem?

    BC_edit new_win = new BC_edit();

    private void btn_Edit_Click(object sender, RoutedEventArgs e)
    {            
        new_win.Title = "a_title";
        new_win.ShowDialog();

        new_win.btn_OK.Click += new RoutedEventHandler(btn_OK_Click);            
    }

    private void btn_OK_Click(object sender, RoutedEventArgs e)
    {
        _MyCollection.Add(new MyData
        {
            Boundary = new_win.Title,
            Type = new_win.cmb_BC_edit_type.SelectedItem.ToString(),
            Option = new_win.cmb_BC_edit_options.SelectedItem.ToString()
        });

        new_win.Close();
    }

Answer 1

You need to subscribe to the event before you show the new window:

    new_win.btn_OK.Click += new RoutedEventHandler(btn_OK_Click);
    new_win.ShowDialog();

Remember that the ShowDialog method is blocking: it won’t return until the window is closed, so the following statements won’t be executed until then.