Pass Data from Child Window to MainWindow TextBlock

Question

In this example, MainWindow has a button that opens Window2.

Window2 has a button that writes \"Hello, World!\" to MainWindo

Answer 1

Another Approach

MainWindow

 public partial class MainWindow : Window
    {

        public MainWindow()
        {
            InitializeComponent();
        }

        private bool DisplayText(string displayText)
        {
            txt_Main.Text = displayText;
            return true;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Window2 win2 = new Window2(DisplayText);
            win2.ShowDialog();
        }
    }

Window2

 public partial class Window2 : Window
    {
        private Func mainWindowMethod;

        public Window2(Func displayMethod)
        {
            InitializeComponent();
            this.mainWindowMethod = displayMethod;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.mainWindowMethod("Hello World");
        }
    }