private void pictureBox_Click(object sender, EventArgs e)
        {
            if (((PictureBox)sender).Image == null)
            {
                MessageBox.Show("無法開啟影像");
                return;
            }

            Bitmap imageSource = new Bitmap(((PictureBox)sender).Image);
            Form   form        = new FormShowImage(imageSource);

            form.Show();
        }
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            Form action = new FormShowImage(new Bitmap(pictureBox1.Image));

            action.Show();
        }