private Point mouseOffset; //记录鼠标指针的坐标         private bool isMouseDown = false; //记录鼠标按键是否按下         private void Form1_MouseDown(object sender, MouseEventArgs e)        {            int xOffset;            int yOffset;            if (e.Button == MouseButtons.Left)            {                xOffset = -e.X - SystemInformation.FrameBorderSize.Width;                yOffset = -e.Y - SystemInformation.CaptionHeight -                SystemInformation.FrameBorderSize.Height;                mouseOffset = new Point(xOffset, yOffset);                isMouseDown = true;            }         }        private void Form1_MouseMove(object sender, MouseEventArgs e)        {            if (isMouseDown)            {                Point mousePos = Control.MousePosition;                mousePos.Offset(mouseOffset.X, mouseOffset.Y);                Location = mousePos;            }         }        private void Form1_MouseUp(object sender, MouseEventArgs e)        {            // 修改鼠标状态isMouseDown的值             // 确保只有鼠标左键按下并移动时，才移动窗体             if (e.Button == MouseButtons.Left)            {                isMouseDown = false;            }         }