how to detect resize

Question

How do I detect when screen is sized(minimize is used).

Answer 1

Here you go

using System;
using System.Security.Permissions;
using System.Windows.Forms;

namespace Demo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            Resize += OnResize;
        }

        private void OnResize(object sender, EventArgs e)
        {
            if (WindowState == FormWindowState.Minimized)
            {
                Console.WriteLine(nameof(OnResize));
            }
        }

        private const int WM_SYSCOMMAND = 0x0112;
        private const int SC_MINIMIZE = 0xF020;

        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
        protected override void WndProc(ref Message m)
        {

            switch (m.Msg)
            {
                case WM_SYSCOMMAND:
                    int command = m.WParam.ToInt32() & 0xfff0;
                    if (command == SC_MINIMIZE)
                    {
                        Console.WriteLine(nameof(WndProc));
                    }
                    // If you don't want to do the default action then break
                    break;
            }

            base.WndProc(ref m);
        }
    }
}