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;
}
}
}
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