在窗体外部拖动picturebox图像

// 在窗体上添加一个picturebox控件，并加载需要拖动的图像

private Point mouseOffset;

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
    // 记录鼠标按下时的坐标位置
    mouseOffset = new Point(-e.X, -e.Y);
}

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
    // 判断鼠标是否按下并移动
    if (e.Button == MouseButtons.Left)
    {
        // 计算鼠标移动的距离
        Point mousePos = Control.MousePosition;
        mousePos.Offset(mouseOffset.X, mouseOffset.Y);

        // 根据距离调整picturebox控件的位置
        pictureBox1.Location = pictureBox1.Parent.PointToClient(mousePos);
    }
}

private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
    // 释放鼠标，并停止拖动
    pictureBox1.Capture = false;
}