C# 将xml中二进制文件 转化为视频 以及 根据节点读取节点值

/// <summary>
        /// 将xml转化为文件
        /// </summary>
        /// <param name="path"></param>
        /// <param name="mediapath"></param>
        public void ReadXmlPicture(string path,string mediapath)
        {
            try
            {
                int readByte = 0;
                int bytesToRead = 1044;
                XmlTextReader xmlTxtRd = new XmlTextReader(path);
                FileStream fs = new FileStream(mediapath, FileMode.Create);
                BinaryWriter bw = new BinaryWriter(fs);
                byte[] base64buffer = new byte[bytesToRead];
                while (xmlTxtRd.Read())
                {
                    if (xmlTxtRd.NodeType == XmlNodeType.Element && xmlTxtRd.Name == "content")
                    {
                        do
                        {
                            readByte = xmlTxtRd.ReadBase64(base64buffer, 0, bytesToRead);
                            bw.Write(base64buffer, 0, readByte);
                        }
                        while (bytesToRead <= readByte);
                    }
                }
                bw.Flush();
                bw.Close();
                fs.Close();
                xmlTxtRd.Close();
            }
            catch (Exception ex)
            {
                WritetoLog(ex.ToString());

            }
        }


/// <summary>
        /// 根据节点获得节点值
        /// </summary>
        /// <param name="path"></param>
        /// <param name="nodeName"></param>
        /// <returns></returns>
        public static string GetNodeInfoByNodeName(string path, string nodeName)
        {
            string XmlString = "";
            XmlDocument xml = new XmlDocument();
            xml.Load(path);
            System.Xml.XmlElement root = xml.DocumentElement;
            System.Xml.XmlNode node = root.SelectSingleNode("//" + nodeName);
            if (node != null)
            {
                XmlString = node.InnerText;
            }
            return XmlString;
        }
/// <summary>
        /// 将xml转化为文件