WPF Cannot hide another window

Question

I am trying to hide the window MainWindow from another window. I thought that the following code would work until I realised that it would just create another instance of MainWindow, and then hide that, and not the original window!

MainWindow MainWindow = new MainWindow();
MainWindow.Hide();

Then I tried to use just MainWindow.Hide() but that doesn't work. How can I do it?

Answer 1

You need to get the actual instance of the Window you are trying to hide. If (guessing by the name) this is your main window, you could try:

Application.Current.MainWindow.Hide();

Otherwise, you need some means of getting the specific instance of the Window you wish to hide.

Answer 2

If the window you want to do the hiding is opened from the MainWindow:

//Main Window
private void OpenChildWindow()
{
     ChildWindow child = new ChildWindow();
     child.Show();
     child.Owner = this;

}

//Child Window
private void CloseMainWindow()
{
     ((Window)Parent).Hide();
}