How do I center a window onscreen in C

Question

I need a way to center the current window  So for example  if a user pushes a button  I want the window to center itself onscreen  I know you can use the startposition property  but I cannot figure out a way to use that other than when the application first starts up  So how do I center the form on the screen

User · Answer

using System  using System Drawing  using System Runtime InteropServices  using System Windows Forms   namespace centrewindow       public partial class Form1   Form               public struct RECT                       public int Left            x position of upper-left corner             public int Top             y position of upper-left corner             public int Right           x position of lower-right corner             public int Bottom          y position of lower-right corner                     DllImport  user32 dll            public static extern IntPtr SetWindowPos IntPtr hWnd  int hWndInsertAfter  int x  int Y  int cx  int cy  int wFlags             DllImport  user32 dll            public static extern bool GetWindowRect HandleRef hwnd  out RECT lpRect            public Form1                         InitializeComponent                       private void button1 Click object sender  EventArgs e                        CentreWindow Handle  GetMonitorDimensions                        private void CentreWindow IntPtr handle  Size monitorDimensions                        RECT rect              GetWindowRect new HandleRef this  handle   out rect                var x1Pos   monitorDimensions Width 2 -  rect Right - rect Left  2              var x2Pos   rect Right - rect Left              var y1Pos   monitorDimensions Height 2 -  rect Bottom - rect Top  2              var y2Pos   rect Bottom - rect Top               SetWindowPos handle  0  x1Pos  y1Pos  x2Pos  y2Pos  0                      private Size GetMonitorDimensions                         return SystemInformation PrimaryMonitorSize                      Centers any window you can get the handle of

User · Answer

Use Form CenterToScreen   method

User · Answer

Use this   this CenterToScreen        This will take care of the current form

User · Answer

In Windows Forms   this StartPosition   FormStartPosition CenterScreen    In WPF   this WindowStartupLocation   WindowStartupLocation CenterScreen    That s all you have to do

User · Answer

Might not be completely relevant to the question  But maybe can help someone    Center Screen non of the above work for me  Reason was I was adding controls dynamically to the form  Technically when it centered it was correct   based on the form before adding the controls    So here was my solution    Should work with both scenarios     int x   Screen PrimaryScreen Bounds Width - this PreferredSize Width  int y   Screen PrimaryScreen Bounds Height - this PreferredSize Height   this Location   new Point x   2  y   2     So you will notice that I am using  PreferredSize  instead of just using Height   Width   The preferred size will hold the value of the form after adding the controls  Where Height   Width won t    Hope this helps someone     Cheers

User · Answer

nbsp Centering a form in runtime  1 Set following property of Form        nbsp  nbsp  nbsp -  StartPosition   CenterScreen      nbsp  nbsp  nbsp -  WindowState  Normal  This will center the form at runtime but if form size is bigger then expected  do second step  2  Add Custom Size after InitializeComponent     public Form1         InitializeComponent        this Size   new Size 800  600

User · Answer

You can use the Screen PrimaryScreen Bounds to retrieve the size of the primary monitor  or inspect the Screen object to retrieve all monitors   Use those with MyForms Bounds to figure out where to place your form

User · Answer

In case of multi monitor and If you prefer to center on correct monitor screen then you might like to try these lines      Save values for future for example  to center a form on next launch  int screen x   Screen FromControl Form  WorkingArea X  int screen y   Screen FromControl Form  WorkingArea Y      Move it and center using correct screen monitor Form Left   screen x  Form Top   screen y  Form Left     Screen FromControl Form  WorkingArea Width - Form Width    2  Form Top     Screen FromControl Form  WorkingArea Height - Form Height    2

User · Answer

A single line   this Location   new Point  Screen PrimaryScreen WorkingArea Width - this Width    2                             Screen PrimaryScreen WorkingArea Height - this Height    2

User · Answer

Using the Property window  Select form   go to property window   select  start position    select whatever the place you want    Programmatically  Form form1   new Form    form1 StartPosition   FormStartPosition CenterScreen  form1 ShowDialog     Note  Do not directly call Form CenterToScreen   from your code  Read here

User · Answer

If you want to center your windows during runtime use the code below  copy it into your application   protected void ReallyCenterToScreen       Screen screen   Screen FromControl this      Rectangle workingArea   screen WorkingArea    this Location   new Point         X   Math Max workingArea X  workingArea X    workingArea Width - this Width    2       Y   Math Max workingArea Y  workingArea Y    workingArea Height - this Height    2        And finally call the method above to get it working   ReallyCenterToScreen

User · Answer

Use Location property of the form  Set it to the desired top left point  desired x    desktop width - form witdh  2  desired y    desktop height - from height  2

[c#] How do I center a window onscreen in C#?

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