C#无边框窗体拖动代码

1.重写

protected override void WndProc(ref Message m)
        {
            if (m.Msg == 163 && this.ClientRectangle.Contains(this.PointToClient(new Point(m.LParam.ToInt32()))) && m.WParam.ToInt32() == 2)
                m.WParam = (IntPtr)1;
            base.WndProc(ref m);
            if (m.Msg == 132 && m.Result.ToInt32() == 1)
                m.Result = (IntPtr)2;
        }

　　2.通过窗体检测鼠标按下

 private Point _MouseOffset;
 private bool _IsMouseDown = false;

 private void frmLogin_MouseDown(object sender, MouseEventArgs e)
        {
            int xOffset;
            int yOffset;

            if (e.Button == MouseButtons.Left)
            {
                xOffset = -e.X;

                yOffset = -e.Y;

                _MouseOffset = new Point(xOffset, yOffset);

                _IsMouseDown = true;

            }
        }

        private void frmLogin_MouseMove(object sender, MouseEventArgs e)
        {
            if (_IsMouseDown)
            {
                Point mousePos = Control.MousePosition;
                mousePos.Offset(_MouseOffset.X, _MouseOffset.Y);
                Location = mousePos;
            }
        }

        private void frmLogin_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                _IsMouseDown = false;
            }
        }