I have the following elements in UI:

1. One main window
2. Two secondary windows

I want to be able to open the 3rd window from my second window. I already have 2 buttons on my 1st Main window that opens the 2nd and 3rd window, but I also want to add a button to my 2nd window that opens the 3rd one.

In my MainWindow.xaml.cs I have these 2 functions that I added and they work fine

private void BtnClickP_L(object sender, RoutedEventArgs e)
{
    Main.Content = new Patient_list();
}

private void BtnClickP_I(object sender, RoutedEventArgs e)
{
    Main.Content = new Patient_info();
}

But when I try to do the same in my Patient_list.xaml.cs file, I got an error when I try to say:

private void BtnClickM_i(object sender, RoutedEventArgs e) { MainWindow.Content = new Patient_info(); // error here CS0103 Main does not exists in current context }

Also if I try to add it to my main file (MainWindow.xaml.cs) just like this:

private void BtnClickP_L(object sender, RoutedEventArgs e)
{
            Main.Content = new Patient_list();
}

private void BtnClickP_I(object sender, RoutedEventArgs e)
{
    Main.Content = new Patient_info();
}

private void BtnClickM_i(object sender, RoutedEventArgs e)
{
    Main.Content = new Patient_info();
}

I have no error, I can run the program, but when clicking on it, it does nothing.

CodePudding user response：

You need to create a MainWindow object first, Try to access your MainWindow like this in your Patient_list.cs:

    private void BtnClickM_i(object sender, RoutedEventArgs e)
    {
        MainWindow MW = (MainWindow)Application.Current.MainWindow;
        MW.Content = new Patient_info();
    }

CodePudding user response：

Get a reference to the MainWindow and set the Content of its Main element:

var window = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
window?.Main.Content = new Patient_info();