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#region 可移动按钮“相关代码”        Point mouse_offset;        private void Button_MouseDown(object sender , MouseEventArgs e)        {            mouse_offset = e.Location; //将当前鼠标相对于“窗体”左上角的坐标赋值给mouse_offset        }        private void Button_MouseMove(object sender , MouseEventArgs e)        {            if ( e.Button == MouseButtons.Left )            {                //将相对屏幕坐标转换为相对工作区的坐标。                int left = PointToClient(Control.MousePosition).X - mouse_offset.X;                int top = PointToClient(Control.MousePosition).Y - mouse_offset.Y;                                //左右可能越界                if(left<0)                    left=0;                if ( left > this.Width )                    left = this.Width - ( (Button)sender ).Width;                //上下可能越界                if ( top < 0 )                    top = 0;                if ( top > this.Height )                    top = this.Height - ( (Button)sender ).Height;                                ( (Button)sender ).Left = left;                ( (Button)sender ).Top = top;            }        }        #endregion