C# 生成RSS通用类

主要用到了几个类文件：

Channel.cs 、ChannelCollection.cs 、 Feed.cs 、 Item.cs  、 ItemCollection.cs

下面给出各个类的源文件：

1、Channel.cs 类

using System;

namespace Utility.Rss
{
    /// <summary>
    /// channel 
    /// </summary>
    [Serializable()]
    public class Channel
    {
        private string _title;
        private string _link;
        private string _description;
        private ItemCollection items = new ItemCollection();

        #region 属性
        /// <summary>
        /// 标题
        /// </summary>
        public string title
        {
            get{return _title;}
            set{_title = value.ToString();}
        }
        /// <summary>
        /// 链接
        /// </summary>
        public string link
        {
            get{return _link;}
            set{_link = value.ToString();}
        }
        /// <summary>
        /// 描述
        /// </summary>
        public string description
        {
            get{return _description;}
            set{_description = value.ToString();}
        }
        public ItemCollection Items
        {
            get { return items; }
        }
        #endregion

        public Channel(){}


    }//
}//

2、ChannelCollection.cs 类

using System;

namespace Utility.Rss
{
    /// <summary>
    /// rssChannelCollection 的摘要说明。
    /// </summary>
    public class ChannelCollection : System.Collections.CollectionBase
    {
        public Channel this[int index]
        {
            get 
            { 
                return ((Channel)(List[index])); 
            }
            set 
            { 
                List[index] = value;
            }
        }

        public int Add(Channel item)
        {
            return List.Add(item);
        }


        public ChannelCollection()
        {            
        }


    }//
}//

  3、Feed.cs类

using System;
using System.Xml;
using System.IO;
using System.Net;
using System.Text;

namespace Utility.Rss
{
    /// <summary>
    /// rssFeed 的摘要说明。
    /// </summary>
    public class Feed
    {
        private string _url;
        private System.DateTime _lastModified;
        private System.DateTime _lastRssDate;
        private Channel channel = new Channel();

        #region 公共属性
        public string url
        {
            get{return _url;}
            set{_url=value;}
        }
        public System.DateTime lastModified
        {
            get{return _lastModified;}
        }
        public System.DateTime lstRssDate
        {
            set{_lastRssDate=value;}
        }
        public Channel Channel
        {
            get { return channel; }
        }        
        #endregion


        public Feed()
        {
        }

        public Feed(string url,System.DateTime dt)
        {
            this._url=url;
            this._lastRssDate=dt;
        }

        public void Read()
        {
            XmlDocument xDoc=new XmlDocument();
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(_url);
            request.Timeout=15000;
            request.UserAgent=@"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.40607; .NET CLR 1.1.4322)";
            Stream stream;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            this._lastModified = response.LastModified;
            stream = response.GetResponseStream();
            StreamReader sr;
                //System.Xml.XmlReader = new XmlReader();
                //stream=Encoding.Convert(Encoding.GetEncoding("GBK"),Encoding.GetEncoding("gb2312"),Convert.ToSByte(stream));
            if(this.Get_CH(response.Headers["Content-Type"].ToString())=="GBK")
            {
                sr= new StreamReader(stream,System.Text.Encoding.GetEncoding("GB2312"));
                xDoc.Load(sr);
            }
            else
            {
//                sr= new StreamReader(stream,System.Text.Encoding.UTF8);
                xDoc.Load(stream);
            }

            if(this._lastRssDate<this._lastModified)
            {
                XmlNodeList xnList=xDoc.DocumentElement["channel"].SelectNodes("item");
                //                XmlNodeList xnList=xDoc.SelectNodes("items");
                int a= xnList.Count;
                foreach(XmlNode xNode in xnList)
                {                
                    Item rt=new Item();
                    rt.title=xNode.SelectSingleNode("title").InnerText.Replace("'","''");
                    rt.link=xNode.SelectSingleNode("link").InnerText.Replace("'","''");
                    rt.description=xNode.SelectSingleNode("description").InnerText.Replace("'","''");
                    try
                    {
                        rt.pubDate=xNode.SelectSingleNode("pubDate").InnerText;
                    }
                    catch
                    {
                        rt.pubDate=this._lastModified.ToString();
                    }
                    channel.Items.Add(rt);
                }
            }
        }



        public string Create()
        {
            return "";
        }

        private string Get_CH(string s)
        {
            int l=s.IndexOf("charset=")+8;
            return s.Substring(l,s.Length-l);
        }

    }//
}//

 4、Item.cs类

using System;

namespace Utility.Rss
{
    /// <summary>
    /// rssItem 的摘要说明。
    /// </summary>
    public class Item
    {
        private string _title;
        private string _link;
        private string _description;
        private string _pubDate;

        #region 属性

        /// <summary>
        /// 标题
        /// </summary>
        public string title
        {
            get{return _title;}
            set{_title=value.ToString();}
        }
        /// <summary>
        /// 链接
        /// </summary>
        public string link
        {
            get{return _link;}
            set{_link=value.ToString();}
        }
        /// <summary>
        /// 描述
        /// </summary>
        public string description
        {
            get{return _description;}
            set{_description=value.ToString();}
        }
        /// <summary>
        /// 频道内容发布日期
        /// </summary>
        public string pubDate
        {
            get{return _pubDate;}
            set{_pubDate=C_Date(value);}
        }

        #endregion

        public Item(){}

        private string C_Date(string input)
        {
            System.DateTime dt;
            try
            {
                dt=Convert.ToDateTime(input);
            }
            catch
            {
                dt=System.DateTime.Now;
            }
            return dt.ToString();
        }

    }//
}// 

5、ItemCollection.cs类

using System;

namespace Utility.Rss
{
    /// <summary>
    /// rssChannelCollection 的摘要说明。
    /// </summary>
    public class ItemCollection : System.Collections.CollectionBase
    {
        public Item this[int index]
        {
            get { return ((Item)(List[index])); }
            set 
            { 
                List[index] = value;
            }
        }
        public int Add(Item item)
        {
            return List.Add(item);
        }

        public ItemCollection()
        {            
        }

    }//
}//

  “C#中解析Rss实现思路及通用类”应用的实例：

string strHtml = "";
string url = "http://rss.xinhuanet.com/rss/native.xml";

Utility.Rss.Feed feed = new Utility.Rss.Feed(url,DateTime.Parse(System.DateTime.Now.AddDays(-1).ToShortDateString()));
                    feed.Read();
                    strHtml += "[记录数目："+feed.Channel.Items.Count+"]<br><br>";
                    for(int i=0;i<feed.Channel.Items.Count;i++)
                    {
//                        arr = feed.Channel.Items[i].title.Split(cSplit);
                        strHtml +="  <a href="+feed.Channel.Items[i].link+" target=_blank><B>"+ feed.Channel.Items[i].title + "</B></a><br>";
                        strHtml +="  <font color=red>"+feed.Channel.Items[i].pubDate + "</font><br>";
                        strHtml +="  "+feed.Channel.Items[i].description + "<br>";
                    }


Response.Write(strHtml);