WndProc(ref Message m)
protected override void WndProc(ref Message m)
{
    const int WM_SYSCOMMAND = 0x0112;
    const int SC_CLOSE = 0xF060;
    if (m.Msg == WM_SYSCOMMAND && (int) m.WParam == SC_CLOSE)
    {
        // 屏蔽传入的消息事件
        this.WindowState = FormWindowState.Minimized;
        return;
     }
    base.WndProc(ref m);
}

           protected override void WndProc(ref    Message m)
         {
             const int WM_SYSCOMMAND = 0x0112;
             const int SC_CLOSE = 0xF060;
             const int SC_MINIMIZE = 0xF020;
             if (m.Msg == WM_SYSCOMMAND && ((int)m.WParam == SC_MINIMIZE || (int)m.WParam == SC_CLOSE))
             {
                 //最小化到系统栏
                 this.Hide();
                 return;
             }
             base.WndProc(ref    m);
         }

重写 WndProc函数来同时实现无标题栏的窗体移动和禁止双击窗体最大化

protected override void WndProc(ref Message m)
        {
            const int WM_NCHITTEST = 0x84;
            const int HTCLIENT = 0x01;
            const int HTCAPTION = 0x02;
            const int WM_SYSCOMMAND = 0x112;
            const int SC_MAXMIZE = 0xF030;
            const int WM_NCLBUTTONDBLCLK = 0xA3;
            switch (m.Msg)
            {
                case 0x4e:
                case 0xd:
                case 0xe:
                case 0x14:
                    base.WndProc(ref m);
                    break;
                case WM_NCHITTEST://鼠标点任意位置后可以拖动窗体
                   
                    this.DefWndProc(ref m);
                    if (m.Result.ToInt32() == HTCLIENT)
                    {
                        m.Result = new IntPtr(HTCAPTION);
                        return;
                    }
                    break;
                case WM_NCLBUTTONDBLCLK://禁止双击最大化
                    Console.WriteLine(this.WindowState);
                   
                        return;

                  
                    break;

                default:
                   
                    base.WndProc(ref m);
                    break;
            }
        }