xml序列化的例子

xml序列化的例子
[System.ComponentModel.DefaultValueAttribute ("2002")]
 #region IXmlSerializable Members
        public System.Xml.Schema.XmlSchema GetSchema()
        {
            return null;
        }
        public void ReadXml(XmlReader reader)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(reader);
            XmlAttribute xa = doc.Attributes["id"];
            if (xa != null)
                id = long.Parse(xa.Value);
            xa = doc.Attributes["uri"];
            if (xa != null)
                uri = xa.Value;
            xa = doc.Attributes["feedtype"];
            if (xa == null)
                feedtype = FeedSky.Services.feedtype.simple;
            XmlNode xn=doc.SelectSingleNode("feed/title");
            if (xn != null)
            {
                title=xn.Value;
            }
            xn = doc.SelectSingleNode("feed/tags");
            if (xn != null)
            {
                tags = xn.Value;
            }
            XmlNodeList xns = doc.SelectNodes("feed/sourcerss");
            if (xns != null && xns.Count > 0)
            {
                List<rss> srs = new List<rss>();
                foreach(XmlNode x in xns)
                {
                    rss r = new rss();
                    r.ReadXml(x.OuterXml);
                    srs.Add(r);
                }
                if (srs.Count > 0)
                    sourcerss = srs.ToArray();
            }
        }
        public void WriteXml(XmlWriter writer)
        {
           // writer.WriteStartElement("feed");
            if (id > 0)
            {
                writer.WriteAttributeString("id", id.ToString());
            }
            if (uri != null)
            {
                writer.WriteAttributeString("uri", uri);
            }
            if (feedtype != FeedSky.Services.feedtype.simple)
            {
                writer.WriteAttributeString("feedtype", feedtype.ToString());
            }
            if (title != null)
            {
                writer.WriteStartElement("title");
                writer.WriteCData(title);
                writer.WriteEndElement();
            }
            if (tags != null&&tags.Length>0)
            {
                writer.WriteStartElement("tags");
                writer.WriteCData(tags);
                writer.WriteEndElement();
            }
            if (sourcerss != null)
            {
                foreach (rss r in sourcerss)
                {
                    writer.WriteStartElement("sourcerss");
                    r.WriteXml(writer);
                    writer.WriteEndElement();
                }
            }
          //  writer.WriteEndElement();
        }
        #endregion
    public class feed:IXmlSerializable
    {
        public long id;
        public string uri;
        public string title;
        public feedtype feedtype;
        public string tags;
        public rss[] sourcerss;

        #region IXmlSerializable Members

        public System.Xml.Schema.XmlSchema GetSchema()
        {
            return null;
        }

        public void ReadXml(XmlReader reader)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(reader);

            XmlAttribute xa = doc.Attributes["id"];
            if (xa != null)
                id = long.Parse(xa.Value);

            xa = doc.Attributes["uri"];
            if (xa != null)
                uri = xa.Value;

            xa = doc.Attributes["feedtype"];
            if (xa == null)
                feedtype = FeedSky.Services.feedtype.simple;

            XmlNode xn=doc.SelectSingleNode("feed/title");
            if (xn != null)
            {
                title=xn.Value;
            }

            xn = doc.SelectSingleNode("feed/tags");
            if (xn != null)
            {
                tags = xn.Value;
            }

            XmlNodeList xns = doc.SelectNodes("feed/sourcerss");
            if (xns != null && xns.Count > 0)
            {
                List<rss> srs = new List<rss>();
                foreach(XmlNode x in xns)
                {
                    rss r = new rss();
                    r.ReadXml(x.OuterXml);
                    srs.Add(r);
                }
                if (srs.Count > 0)
                    sourcerss = srs.ToArray();
            }
        }

        public void WriteXml(XmlWriter writer)
        {
           // writer.WriteStartElement("feed");
            if (id > 0)
            {
                writer.WriteAttributeString("id", id.ToString());
            }
            if (uri != null)
            {
                writer.WriteAttributeString("uri", uri);
            }
            if (feedtype != FeedSky.Services.feedtype.simple)
            {
                writer.WriteAttributeString("feedtype", feedtype.ToString());
            }
            if (title != null)
            {
                writer.WriteStartElement("title");
                writer.WriteCData(title);
                writer.WriteEndElement();
            }
            if (tags != null&&tags.Length>0)
            {
                writer.WriteStartElement("tags");
                writer.WriteCData(tags);
                writer.WriteEndElement();
            }

            if (sourcerss != null)
            {
                foreach (rss r in sourcerss)
                {
                    writer.WriteStartElement("sourcerss");
                    r.WriteXml(writer);
                    writer.WriteEndElement();
                }
            }

          //  writer.WriteEndElement();
        }

        #endregion
    }