C # Mouse on the control to drag the Move Form Move window

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#region 移动窗体 移动窗口 private Point _mousePoint; private int topA(Control cc) {     if (cc == null || cc == this) return 0;     if (cc.Parent == null || cc.Parent == this)         return cc.Top;     else         return topA(cc.Parent) + cc.Top; } private int leftA(Control cc) {     if (cc == null || cc == this) return 0;     if (cc.Parent == null || cc.Parent == this)         return cc.Left;     else         return leftA(cc.Parent) + cc.Left; } private void labTitle_MouseDown(object sender, MouseEventArgs e) {     Control cc = (Control)sender;     if (e.Button == MouseButtons.Left)     {         _mousePoint.X = e.X + leftA(cc);         _mousePoint.Y = e.Y + topA(cc);     } } private void labTitle_MouseMove(object sender, MouseEventArgs e) {     if (e.Button == MouseButtons.Left)     {         Top = MousePosition.Y - _mousePoint.Y;         Left = MousePosition.X - _mousePoint.X;     } } #endregion