用 XML 文件持久化和恢复图片信息

随便写写的一个例子：

        // 保存图片到 XML 文件
        private void Form1_Load(object sender, System.EventArgs e)
        {
            Image img = Image.FromFile(@"E:\MyDocs\My Pictures\样品.jpg");
            System.IO.MemoryStream stream = new System.IO.MemoryStream();
            img.Save(stream, ImageFormat.Jpeg);
            byte[] b = stream.GetBuffer();
            string s = Convert.ToBase64String(b);

            XmlDocument doc = new XmlDocument();
            doc.AppendChild(doc.CreateElement("image"));
            XmlElement elmtData = doc.CreateElement("data");
            elmtData.InnerText = s;
            doc.DocumentElement.AppendChild(elmtData);
            doc.Save("test.xml");
        }

        // 从 XML 文件中读取图片信息
        private void button1_Click(object sender, System.EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load("test.xml");
            string s = doc.DocumentElement.SelectSingleNode("data").InnerText;
            byte[] b = Convert.FromBase64String(s);
            MemoryStream stream = new MemoryStream(b);
            Bitmap bitmap = new Bitmap(stream);

            this.pictureBox1.Image = bitmap;
        }