i have big problem visual studio wpf , when i try to send any string it doesn't work i tried to write public string str { set; get; } This problem has been stuck with it for a long time, I tried a lot to use crooked methods, but the program or project crashes.

im using visual studio wpf c#

thank you for answer

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

        private void button1_MouseEnter(object sender, MouseEventArgs e)
        {
            Info.Content = "Hello world";
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            Frame.Content = new Page1();
        }

        private void button2_MouseLeave(object sender, MouseEventArgs e)
        {
            Info.Content = "Label";
        }

        private void button1_MouseLeave(object sender, MouseEventArgs e)
        {
            Info.Content = "Label";
        }
    }

here Page class

public partial class Page1 : Page
    {
        public Page1()
        {
            InitializeComponent();
        }

        private void button1_MouseEnter(object sender, MouseEventArgs e)
        {
            MainWindow mw = new MainWindow();
            mw.Info.Content = "Test Public";
        }
    }

CodePudding user response：

Update Page1's button1_MouseEnter code to:

private void button1_MouseEnter(object sender, MouseEventArgs e)
    {
      MainWindow mw =Application.Current.Windows.Cast<Window>()
        .FirstOrDefault(window=>window is MainWindow) as MainWindow;
      mw.Info.Content = "Test Public";
    }