做图片查看器中的代码

   //显示图片
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Load(openFileDialog1.FileName);
            }

  //清除图片
            pictureBox1.Image = null;

 

  //设置背景颜色
            if (colorDialog1.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.BackColor = colorDialog1.Color;
            }

    //关闭
            this.Close();

    //拉伸
            if (checkBox1.Checked)
            {
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
            }
            else
            {
                pictureBox1.SizeMode = PictureBoxSizeMode.Normal;
            }