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一个登录窗体，FormBorderStyle属性设置为None,打开后不能挪动位置，有时候会妨碍使用，有点恶心。网上找了段内容，实现拖动效果：

#region 无边框拖动效果,Form被PictureBox覆盖，Form事件不会被触发        [System.Runtime.InteropServices.DllImport("user32.dll")]//拖动无窗体的控件        public static extern bool ReleaseCapture();        [System.Runtime.InteropServices.DllImport("user32.dll")]        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);        [System.Runtime.InteropServices.DllImportAttribute("user32.dll")]        internal static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);                                         public const int WM_SYSCOMMAND = 0x0112;        public const int SC_MOVE = 0xF010;        public const int HTCAPTION = 0x0002;                                     private void pictureBoxBackground_MouseDown(object sender, MouseEventArgs e)        {            if (e.Button == MouseButtons.Left)            {                ReleaseCapture();                SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);            }        }        public const int WM_NCLBUTTONDOWN = 0xA1;        public const int HT_CAPTION = 0x2;        public const int MOUSEWHEEL = 0x020A;        private void pictureBoxBackground_MouseMove(object sender, MouseEventArgs e)        {            if (e.Button == MouseButtons.Left)            {                ReleaseCapture();                SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);            }        }        #endregion

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