How to get the size of the current screen in WPF

Question

I know I can get the size of the primary screen by using  System Windows SystemParameters PrimaryScreenWidth  System Windows SystemParameters PrimaryScreenHeight    But how do I get the size of the current screen   Multi-Screen users do not always use the primary screen and not all screens are using the same resolution  right    It would be nice to be able to acces the size from XAML  but doing so from code  C   would suffice

User · Answer

This will give you the current screen based on the top left of the window  just call this CurrentScreen   to get info on the current screen   using System Windows  using System Windows Forms   namespace Common Helpers       public static class WindowHelpers                public static Screen CurrentScreen this Window window                          return Screen FromPoint new System Drawing Point  int window Left  int window Top

User · Answer

I came across this post and found that none of the answers fully captured what I was trying to do  I have a laptop that has a 3840x2160 resolution and two monitors with 1920x1080 resolution  In order to get the correct monitor size in my WPF application I had to make the application DPI aware  Then I used the Win32 API to get the monitor size  I did this by first moving the window to the monitor that I wanted to get the size from  Then by getting the hwnd of the application s MainWindow  doesn t have to be the main window but my application only has one window  and an IntPtr to the monitor  Then I created a new instance of the MONITORINFOEX struct and called the GetMonitorInfo method  The MONITORINFOEX struct has both the working area and the full resolution of the screen so you can return whichever one you need  This will also allow you to leave out a reference to System Windows Forms  assuming you don t need it something else in your application   I used the  NET Framework Reference Source for System Windows Forms Screen to come up with this solution  public System Drawing Size GetMonitorSize         var window   System Windows Application Current MainWindow      var hwnd   new WindowInteropHelper window  EnsureHandle        var monitor   NativeMethods MonitorFromWindow hwnd  NativeMethods MONITOR DEFAULTTONEAREST       NativeMethods MONITORINFO info   new NativeMethods MONITORINFO        NativeMethods GetMonitorInfo new HandleRef null  monitor   info       return info rcMonitor Size     internal static class NativeMethods       public const Int32 MONITOR DEFAULTTONEAREST   0x00000002        DllImport  quot user32 dll quot        public static extern IntPtr MonitorFromWindow IntPtr handle  Int32 flags         DllImport  quot user32 dll quot   CharSet   CharSet Auto       public static extern bool GetMonitorInfo HandleRef hmonitor  MONITORINFO info             StructLayout LayoutKind Sequential  CharSet   CharSet Auto  Pack   4       public class MONITORINFO               internal int cbSize   Marshal SizeOf typeof MONITORINFO            internal RECT rcMonitor   new RECT            internal RECT rcWork   new RECT            internal int dwFlags   0              StructLayout LayoutKind Sequential       public struct RECT               public int left          public int top          public int right          public int bottom           public RECT int left  int top  int right  int bottom                        this left   left              this top   top              this right   right              this bottom   bottom                     public RECT System Drawing Rectangle r                        left   r Left              top   r Top              right   r Right              bottom   r Bottom                     public static RECT FromXYWH int x  int y  int width  int height    gt  new RECT x  y  x   width  y   height            public System Drawing Size Size   gt  new System Drawing Size right - left  bottom - top

User · Answer

I understand the demands  The thing is  there are WPF Methods for getting those values - but yes  one of the contributors is right  not directly  The Solution is not to get all those workarounds  but to change the initial approach according to clean Design and Development   A  Set the initial Main Window to Screen  B  Get the Values for the ActualWindow including a ton of useful WPF Methods  C  You can add as many Windows as you like for the behaviour you want to have  like resizeable  minimized whatever    but now you always can access the Loaded and Rendered Screen  Please be careful with the following example  there is some Code around that makes it necessary to use that kind of approach  however it should work  It would give you the Points for each of the Corners of your Screen   Working Example on Single  Dual Monitor and different Resolutions  Within the Primal Main Window Class    InitializeComponent          ActualWindow AddHandler Window LoadedEvent  new RoutedEventHandler StartUpScreenLoaded      Routed Event   private void StartUpScreenLoaded object sender  RoutedEventArgs e                Window StartUpScreen   sender as Window              Dispatcher Format B          Dispatcher Invoke new Action      gt                           Get Actual Window on Loaded             StartUpScreen InvalidateVisual                System Windows Point CoordinatesTopRight   StartUpScreen TranslatePoint new System Windows Point  StartUpScreen ActualWidth    0d    ActualWindow               System Windows Point CoordinatesBottomRight   StartUpScreen TranslatePoint new System Windows Point  StartUpScreen ActualWidth    StartUpScreen ActualHeight    ActualWindow               System Windows Point CoordinatesBottomLeft   StartUpScreen TranslatePoint new System Windows Point  0d    StartUpScreen ActualHeight    ActualWindow                   Set the Canvas Top Right  Bottom Right  Bottom Left Coordinates             System Windows Application Current Resources  StartUpScreenPointTopRight     CoordinatesTopRight              System Windows Application Current Resources  StartUpScreenPointBottomRight     CoordinatesBottomRight              System Windows Application Current Resources  StartUpScreenPointBottomLeft     CoordinatesBottomLeft              DispatcherPriority Loaded

User · Answer

It works with  this Width   System Windows SystemParameters VirtualScreenWidth  this Height   System Windows SystemParameters VirtualScreenHeight    Tested on 2 monitors

User · Answer

double screenWidth   System Windows SystemParameters PrimaryScreenWidth  double screenhight  System Windows SystemParameters PrimaryScreenHeight

User · Answer

Here budy  This will give you only the width and height of the workarea   System Windows SystemParameters WorkArea Width System Windows SystemParameters WorkArea Height

User · Answer

If you are familiar with using System Windows Forms class then you can just add a reference of System Windows Forms class to your project   Solution Explorer -  References -  Add References    -    Assemblies   Framework   -  scroll down and check System Windows Forms assembly -  OK   Now you can add using System Windows Forms  statement and use screen in your wpf project just like before

User · Answer

Why not just use this    var interopHelper   new WindowInteropHelper System Windows Application Current MainWindow   var activeScreen   Screen FromHandle interopHelper Handle

User · Answer

If you use any full screen window  having its WindowState   WindowState Maximized  WindowStyle   WindowStyle None   you can wrap its contents in System Windows Controls Canvas like this    lt Canvas Name  MyCanvas  Width  auto  Height  auto  gt       lt  Canvas gt    Then you can use MyCanvas ActualWidth and MyCanvas ActualHeight to get the resolution of the current screen  with DPI settings taken into account and in device independent units  It doesn t add any margins as the maximized window itself does    Canvas accepts UIElements as children  so you should be able to use it with any content

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I created a little wrapper around the Screen from System Windows Forms  currently everything works     Not sure about the  device independent pixels   though   public class WpfScreen       public static IEnumerable lt WpfScreen gt  AllScreens                 foreach  Screen screen in System Windows Forms Screen AllScreens                        yield return new WpfScreen screen                        public static WpfScreen GetScreenFrom Window window                WindowInteropHelper windowInteropHelper   new WindowInteropHelper window           Screen screen   System Windows Forms Screen FromHandle windowInteropHelper Handle           WpfScreen wpfScreen   new WpfScreen screen           return wpfScreen             public static WpfScreen GetScreenFrom Point point                int x    int  Math Round point X           int y    int  Math Round point Y               are x y device-independent-pixels            System Drawing Point drawingPoint   new System Drawing Point x  y           Screen screen   System Windows Forms Screen FromPoint drawingPoint           WpfScreen wpfScreen   new WpfScreen screen            return wpfScreen             public static WpfScreen Primary               get   return new WpfScreen System Windows Forms Screen PrimaryScreen                private readonly Screen screen       internal WpfScreen System Windows Forms Screen screen                this screen   screen             public Rect DeviceBounds               get   return this GetRect this screen Bounds                public Rect WorkingArea               get   return this GetRect this screen WorkingArea                private Rect GetRect Rectangle value                   should x  y  width  height be device-independent-pixels            return new Rect                                             X   value X                         Y   value Y                         Width   value Width                         Height   value Height                                  public bool IsPrimary               get   return this screen Primary               public string DeviceName               get   return this screen DeviceName

User · Answer

Take the time to scan through the SystemParameters members   VirtualScreenWidth VirtualScreenHeight  These even take into account the relative positions of the screens  Only tested with two monitors

User · Answer

I also needed the current screen dimension  specifically the Work-area  which returned the rectangle excluding the Taskbar width   I used it in order to reposition a window  which is opened to the right and down to where the mouse is positioned  Since the window is fairly large  in many cases it got out of the screen bounds  The following code is based on  e-j answer  This will give you the current screen     The difference is that I also show my repositioning algorithm  which I assume is actually the point   The code   using System Windows  using System Windows Forms   namespace MySample        public class WindowPostion                    lt summary gt              This method adjust the window position to avoid from it going              out of screen bounds               lt  summary gt               lt param name  topLeft  gt The requiered possition without its offset lt  param gt               lt param name  maxSize  gt The max possible size of the window lt  param gt               lt param name  offset  gt The offset of the topLeft postion lt  param gt               lt param name  margin  gt The margin from the screen lt  param gt               lt returns gt The adjusted position of the window lt  returns gt          System Drawing Point Adjust System Drawing Point topLeft  System Drawing Point maxSize  int offset  int margin                        Screen currentScreen   Screen FromPoint topLeft               System Drawing Rectangle rect   currentScreen WorkingArea                  Set an offset from mouse position              topLeft Offset offset  offset                   Check if the window needs to go above the task bar                  when the task bar shadows the HUD window              int totalHight   topLeft Y   maxSize Y   margin               if  totalHight  gt  rect Bottom                                topLeft Y -   totalHight - rect Bottom                       If the screen dimensions exceed the hight of the window                    set it just bellow the top bound                  if  topLeft Y  lt  rect Top                                        topLeft Y   rect Top   margin                                               int totalWidth   topLeft X   maxSize X   margin                 Check if the window needs to move to the left of the mouse                  when the HUD exceeds the right window bounds              if  totalWidth  gt  rect Right                                   Since we already set an offset remove it and add the offset                     to the other side of the mouse  2x  in addition include the                     margin                  topLeft X -   maxSize X    2   offset   margin                        If the screen dimensions exceed the width of the window                    don t exceed the left bound                  if  topLeft X  lt  rect Left                                        topLeft X   rect Left   margin                                               return topLeft                      Some explanations                                                                 1  topLeft - position of the top left at the desktop  works                         for multi screens - with different aspect ratio                                           Screen1              Screen2                                                 -   -------------------  -------------------  Screen3                                                                              -----------------   -                                                                      -                          1080                                                                                                                                                                      900                                                                                                 -   -------------------  -------------------  -----------------   -                       ---------            ---------            --------                            -----------------      -----------------      ---------------                               1920                 1920                1440                    If the mouse is in Screen3 a possible value might be                             topLeft X 4140 topLeft Y 195                                                  2  offset - the offset from the top left  one value for both                        X and Y directions                                                            3  maxSize - the maximal size of the window - including its                         size when it is expanded - from the following example                            we need maxSize X   200  maxSize Y   150 - To avoid the expansion                being out of bound                                                                Non expanded window                                                               ------------------------------  -                                                  Window Name                X                                                     ------------------------------                                                                -----------------         100                                               Text1                                                                                         -----------------                                                                                                                                           ------------------------------  -                                                  ----------------------------                                                                  200                                                                 Expanded window                                                                   ------------------------------  -                                                  Window Name                X                                                     ------------------------------                                                                -----------------                                                           Text1                                                                                         -----------------         150                                                                                                                                           -----------------                                                           Text2                                                                                         -----------------                                                       ------------------------------  -                                                  ----------------------------                                                                  200                                                             4  margin - The distance the window should be from the screen                       work-area - Example                                                                -------------------------------------------------------------  -                                                                                    Margin                                                                           -                                                                                                                                                                                                                                                                                                      ------------------------------                                                       Window Name                X                                                       ------------------------------                                                                 -----------------                                                            Text1                                                                                          -----------------                                                                                                                                                         -----------------                                                            Text2                                                                                          -----------------                                                         ------------------------------       -                                                                                    Margin          -------------------------------------------------------------   -                   start                                              en   12 00                      -------------------------------------------------------------                      -                                                           -                      Margin                                                    Margin                Note that this simple algorithm will always want to leave the cursor             out of the window  therefor the window will jumps to its left                     ---------------------------------          ---------------------------------                         - --------------            --------------  -                                           Window     X                Window     X                                              --------------             --------------                                                      ---                         ---                                                   Val              - gt            Val                                                                 ---                         ---                                                --------------            --------------                                                                                                           ---------------------------------           ---------------------------------        start                  en   12 00              start                  en   12 00       ---------------------------------          ---------------------------------    If this is not a requirement  you can add a parameter to just use                the margin                                                                        ---------------------------------          ---------------------------------                         - --------------                          - ------------                                Window     X                              Window     X                                --------------                           --------------                                        ---                                       ---                                     Val              - gt                          Val                                                   ---                                       ---                                  --------------                          --------------                                                                                             ---------------------------------           ---------------------------------        start                  en   12 00              start                  en   12 00       ---------------------------------          ---------------------------------    Supports also the following scenarios    1  Screen over screen          -----------------                                                                                                                                -----------------        -------------------                                           -                                                                                                                   -------------------              ---------          2  Window bigger than screen hight or width       ---------------------------------          ---------------------------------                                                         --------------                                                                            Window     X                                                - ------------  -           --------------    -                                              Window                             ---                                                    ------------  -   - gt           Val                                                                      ---                         ---                                                       Val                                 ---                                                             ---                   Val                                      ---------------------------------            ---------------------------------           start                  en   12 00               start                  en   12 00          ---------------------------------           ---------------------------------                                      ---                       ---                                    Val                      --------------                                      ---                                 --------------          ---------------------------------               ---------------------------------                                                                                                                                                                -------------------------------  ---              - --------------------------  --------           W -dow                           X                    Window                           X           -------------------------------  ---                 --------------------------  --------                   ---        ---        -  -                            ---        ---         ---     - gt         Val          Val          Val                               Val          Val          Va                               ---        ---        -  -                            ---        ---         ---            -------------------------------  ---        ---------------------------------  --------      ---------------------------------           start                  en   12 00                   start                  en   12 00               ---------------------------------               ---------------------------------          I had no choice but using the code format  otherwise the white spaces would have been lost     Originally this appeared in the code above as a  lt remark gt  lt code gt     lt  code gt  lt  remark gt

User · Answer

As far as I know there is no native WPF function to get dimensions of the current monitor  Instead you could PInvoke native multiple display monitors functions  wrap them in managed class and expose all properties you need to consume them from XAML

User · Answer

Center Window on the screen in XAML WindowStartupLocation  CenterOwner  then call in WindowLoaded    double ScreenHeight   2    Top   0 5   Height

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