C# 通过消息捕获处理窗体最大化/最小化

通过以下的一些代码可以实现捕获相关的一些消息事件;

以及可以通过调用 SetCloseMenu();实现关闭一些按钮功能如屏蔽关闭按钮功能等;

需要添加命名空间:using System.Runtime.InteropServices;

        private const int WM_SYSCOMMAND = 0x112;
        private const int MF_REMOVE = 0x1000;
        private const int SC_RESTORE = 0xF120;     //还原   
        private const int SC_MOVE = 0xF010;   //移动   
        private const int SC_SIZE = 0xF000;   //大小   
        private const int SC_MINIMIZE = 0xF020;   //最小化   
        private const int SC_MAXIMIZE = 0xF030;   //最大化   
        private const int SC_CLOSE = 0xF060;   //关闭     
        [DllImport("USER32.DLL")]
        public static extern int GetSystemMenu(int hwnd, int bRevert);
        [DllImport("USER32.DLL")]
        public static extern int RemoveMenu(int hMenu, int nPosition, int wFlags);
     
         private void SetCloseMenu()
        {
            int hMenu = GetSystemMenu(this.Handle.ToInt32(), 0);//移除关闭按钮
            RemoveMenu(hMenu, SC_CLOSE, MF_REMOVE);   
        }    

         /// <summary>
        /// 
        /// </summary>
        /// <param name="m"></param>
        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_SYSCOMMAND:
                    switch (m.WParam.ToInt32())
                    {
                        case SC_MINIMIZE:
                            base.WndProc(ref m);
                            //捕获最小化消息
                            break;
                        case SC_RESTORE:
                            base.WndProc(ref m);
                            //捕获还原消息
                            break;
                        case SC_MAXIMIZE:
                            base.WndProc(ref m);
                            //捕获最大化消息
                            break;
                        default:
                            base.WndProc(ref m);
                            break;
                    }
                    break;
                default:
                    base.WndProc(ref m);
                    break;
            }
        }