winfrom无边框拖动

        #region 无边框拖动

        // WinAPI
        [DllImport("user32.dll")]
        private static extern bool ReleaseCapture();

        [DllImport("user32.dll")]
        private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        private const int WM_NCLBUTTONDOWN = 0xA1;
        private const int HTCAPTION = 0x2;

        private void Form_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                ReleaseCapture();
                SendMessage(this.Handle, WM_NCLBUTTONDOWN, HTCAPTION, 0);
            }
        }

        #endregion 无边框拖动

MouseDown事件选择Form_MouseDown 就可以拖动