I'm trying to create a little database program in which you can add, modify and remove articles for a news site. There is a MainWindow with a DataGrid to display all the articles. Once the Add button is pressed, a new window opens to let you edit the newly created article. Or the modify button can be pressed to edit the currently selected article. How can i pass the article back to the MainWindow to add it to the ObservableCollection/modify the ObservableCollection?

public partial class MainWindow : Window
    {
        private int lastIdArtikel = 0;
        private Artikel currentSelection = null; 
        private ObservableCollection<Artikel> ArtikelDatabase = new ObservableCollection<Artikel>();

        private void Add_Click(object sender, RoutedEventArgs e)
        {
            Artikel nieuwArtikel = new Artikel(  lastIdArtikels);
            ArtikelDatabase.Add(nieuwArtikel);
            ArtikelVenster artikelVenster = new ArtikelVenster(ref nieuwArtikel);
            artikelVenster.Show();
        }

        private void Modify_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                ArtikelVenster artikelVenster = new ArtikelVenster(ref huidigeSelectie);
                artikelVenster.Show();
            }
            catch (NullReferenceException exception)
            {
                Console.WriteLine(exception.StackTrace);
            }            
        }

 public partial class ArtikelVenster : Window
    {
        public Artikel artikel { get; private set; }
        public int id { get; private set; }
        public string title { get; private set; }
        public object category { get; private set; }
        public string nameJournalist { get; private set; }
        public bool mayBePublished { get; private set; }
        public bool isPublished { get; private set; }
        public string content { get; private set; }
        public int length { get; private set; }

        public ArtikelVenster(ref Artikel huidigArtikel)
        {
            InitializeComponent();
            artikel = huidigArtikel;
            try
            {
                LaadData();
            }
            catch (NullReferenceException exception)
            {
                Console.WriteLine(exception.StackTrace);
            }
            CategorieBox.SelectedIndex = 2;
        }

        private void Cancel_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void LaadData()
        {
            IdLabel.Content = artikel.id;
            DatumLabel.Content = artikel.creationDate.ToString();
            TitelBox.Text = artikel.title;
            CategorieBox.SelectedItem = artikel.category;
            NaamJournalistBox.Text = artikel.nameJournalist;
            IsGepubliceerdToggle.IsChecked = artikel.isPublished;
            MagGepubliceerdWordenToggle.IsChecked = artikel.mayBePublished;
            if (artikel.content == null)
            {
                InhoudBox.Selection.Text = "";
            }
            else
            {
                InhoudBox.Selection.Text = artikel.content;
            }
        }

        private void Confirm_Click(object sender, RoutedEventArgs e)
        {
            if (artikel == null)
            {
                Artikel nieuwArtikel = new Artikel(id);
                nieuwArtikel.updateArtikel(title, category, nameJournalist, mayBePublished, isPublished, content, length);
                artikel = nieuwArtikel;
            }
            else
            {
                artikel.updateArtikel(title, category, nameJournalist, mayBePublished, isPublished, content, length);
            }
            this.Close();
        }

        private void TitelBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            title = TitelBox.Text;
        }

        private void CategorieBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            category = CategorieBox.SelectedItem;
        }

        private void NaamJournalistBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            nameJournalist = NaamJournalistBox.Text;
        }
    }

    public class Artikel
    {
        public int id { get; private set; }
        public string title { get; private set; }
        public object category { get; private set; }
        public string nameJournalist { get; private set; }
        public bool mayBePublished { get; private set; }
        public bool isPublished { get; private set; }
        public string content { get; private set; }
        public int length { get; private set; }
        public DateTime creationDate { get; private set; }

        public Artikel(int id)
        {
            this.id = id;
            this.creationDate = DateTime.Now;
        }

        public void updateArtikel(string title, object category, string nameJournalist, bool mayBePublished, bool isPublished, string content, int length)
        {
            this.title = title;
            this.category = category;
            this.nameJournalist = nameJournalist;
            this.mayBePublished = mayBePublished;
            this.isPublished = isPublished;
            this.content = content;
            this.length = length;
        }
    }
}

Some parts are left out to make it more readable. If anymore info is needed, let me know.

CodePudding user response：

Declare an event in your window class

public event EventHandler<Artikel> Confirmed; 

Invoke it in the confirm button click handler

//artikel being the object that you want to send back to the main window  
 
Confirmed?.Invoke(this,artikel);

You can add listener from the caller :

artikelVenster.Confirmed =(s, e) =>{//do something with e };
artikelVenster.Show();