C#下移动无边框窗体（直接粘贴可用）

        #region //移动无边框窗体

        private bool _frmBeginMove = false;
        Point _frmLocation = new Point();
        protected override void OnMouseMove(MouseEventArgs e)
        {
            if (_frmBeginMove)
            {
                Point p = this.PointToScreen(e.Location );
                p.Offset(-_frmLocation.X,-_frmLocation.Y );
                this.Location =p;
            }
            base.OnMouseMove(e);
        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            this._frmBeginMove = true;
            _frmLocation = e.Location;
            base.OnMouseDown(e);
        }
        protected override void OnMouseUp(MouseEventArgs e)
        {
            this._frmBeginMove = false;
            base.OnMouseUp(e);
        }
        protected override void OnMouseLeave(EventArgs e)
        {
            _frmLocation = new Point();
            this._frmBeginMove = false;
            base.OnMouseLeave(e);
        }
        #endregion