Going fullscreen on secondary monitor

Question

How can you program a dotNet Windows (or WPF) Application in order to let it going fullscreen on the secondary monitor?

Answer 1

Extension method to Maximize a window to the secondary monitor (if there is one). Doesn't assume that the secondary monitor is System.Windows.Forms.Screen.AllScreens[2];

using System.Linq; using System.Windows;  namespace ExtendedControls {     static public class WindowExt     {          // NB : Best to call this function from the windows Loaded event or after showing the window         // (otherwise window is just positioned to fill the secondary monitor rather than being maximised).         public static void MaximizeToSecondaryMonitor(this Window window)         {             var secondaryScreen = System.Windows.Forms.Screen.AllScreens.Where(s => !s.Primary).FirstOrDefault();              if (secondaryScreen != null)             {                 if (!window.IsLoaded)                     window.WindowStartupLocation = WindowStartupLocation.Manual;                  var workingArea = secondaryScreen.WorkingArea;                 window.Left = workingArea.Left;                 window.Top = workingArea.Top;                 window.Width = workingArea.Width;                 window.Height = workingArea.Height;                 // If window isn't loaded then maxmizing will result in the window displaying on the primary monitor                 if ( window.IsLoaded )                     window.WindowState = WindowState.Maximized;             }         }     } } 

Answer 2

For WPF apps look at this post. Ultimately it depends on when the WindowState is set to Maximized. If you set it in XAML or in window constructor (i.e. before the window is loaded) it will always be maximized onto primary display. If, on the other hand, you set WindowState to Maximized when the window is loaded - it will maximise on the screen on which it was maximized before.