Jpg文件和Xml 文件格式的互换

 //把Jpg文件保存为Xml文件
            /**//*--------------------------------------------*/            
            try
            {
                XmlDocument myXmlDoc = new XmlDocument();
                myXmlDoc.LoadXml("<picture><name>picture</name></picture>");
                XmlElement elem = myXmlDoc.CreateElement("image");
                // 打开图片文件，利用该图片构造一个文件流
                FileStream fs = new FileStream("e:\\C#.pdf",FileMode.Open);
                // 使用文件流构造一个二进制读取器将基元数据读作二进制值
                BinaryReader br = new BinaryReader(fs);
                byte[] imageBuffer = new byte[br.BaseStream.Length];
                br.Read(imageBuffer,0,Convert.ToInt32(br.BaseStream.Length));
                string textString = System.Convert.ToBase64String(imageBuffer);
                fs.Close();
                br.Close();
                XmlText text = myXmlDoc.CreateTextNode(textString);
                myXmlDoc.DocumentElement.AppendChild(elem);
                myXmlDoc.DocumentElement.LastChild.AppendChild(text);
                myXmlDoc.Save("e:\\docSave.xml"); 
                MessageBox.Show("读写结束！");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());

            }        
            /**//*--------------------------------------------*/

//把XML文件保存为Jpg文件
            /**//*--------------------------------------------*/
            try
            {
                int readByte = 0;
                int bytesToRead = 1044;
                XmlTextReader xmlTxtRd = new XmlTextReader("e:\\docSave.xml");
                FileStream fs = new FileStream("e:\\002.pdf",FileMode.Create);
                BinaryWriter bw = new BinaryWriter(fs);
                byte[] base64buffer = new byte[bytesToRead];
                while(xmlTxtRd.Read())
                {
                    if (xmlTxtRd.NodeType == XmlNodeType.Element && xmlTxtRd.Name == "image")
                    {
                        do
                        {
                            readByte = xmlTxtRd.ReadBase64(base64buffer,0,bytesToRead);
                            bw.Write(base64buffer,0,readByte);
                        }
                        while( bytesToRead<= readByte);
                    }
                }
                bw.Flush();
                bw.Close();
                fs.Close();
                xmlTxtRd.Close();
                MessageBox.Show("读写结束！");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            /**//*--------------------------------------------*/

转换内容 不仅仅限于Jpg