C#中解析Rss实现思路及通用类–源代码

Rss是 Web 2.0 时代的主要特征，那么有没有一种通用的方法来解析Rss呢？

当然有了，呵呵。下面给出了一种思路，仅供参考！

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();

属性 #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();

公共属性 #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;

属性 #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()
… {
}

} //
} //