c#编程 RSS2.0解析器代码
最近工作比较忙，加上杂七杂八的一堆事情，博客也开始长草了=_=。手里现在唯一没有停滞的项目就是笔者的网站发布机的开发。这是其中解析rss文件的代码；个人觉得比较实用，所以把单独提出来，和各位一道分享^_^。用法也相当简单，下面的代码中已经包含了控制台的示例代码，有兴趣的朋友可以看看
using System;
using System.Xml;
using System.Collections.Generic;
namespace Freemose.Base.RSS
{
public interface iXml{
XmlNode FindChildNode(XmlNode node, string name);
}
public class RssReader :iXml
{
private XmlDocument doc;
/// <summary>
/// 文档DOM
/// </summary>
public XmlDocument Doc
{
get { return doc; }
}
private XmlNode rootnode;
private List<XmlNode> items;
/// <summary>
/// 获取channel的相关属性
/// </summary>
/// <param name="attribute">指定属性名称</param>
/// <returns></returns>
public string this[RssChannel attribute]
{
get
{
try
{
XmlNode node = FindChildNode(rootnode, attribute.ToString());
if (node == null)
{
return "";
}
return node.InnerText;
}
catch (Exception e)
{
throw e;
}
}
}
/// <summary>
/// 获取指定item中的属性
/// </summary>
/// <param name="index">item索引</param>
/// <param name="item">item子元素的属性描述</param>
/// <returns></returns>
public string this[int index,RssItem item]{
get
{
try
{
XmlNode node = FindChildNode(items[index], item.ToString());
if (node == null)
{
return "";
}
return node.InnerText;
}
catch (Exception e)
{
throw e;
}
}
}
/// <summary>
/// 获取item节点的计数
/// </summary>
public int TotalItemNum
{
get { return items.Count; }
}
/// <summary>
/// 新建一个rss 2.0解析器
/// </summary>
public RssReader()
{
doc = new XmlDocument();
items = new List<XmlNode>();
}
/// <summary>
/// 从文件或url中加载xml文档
/// </summary>
/// <param name="filename">文件名或url地址</param>
public void Load(string filename)
{
try
{
doc.Load(filename);
XmlNode rssnode = FindChildNode(doc, "rss");
rootnode = FindChildNode(rssnode, "channel");
GetItemsDetail();
}
catch (Exception e)
{
throw e;
}
}
/// <summary>
/// 从文本中加载xml文档
/// </summary>
/// <param name="xmltext">xml文本</param>
public void LoadXml(string xmltext)
{
try
{
doc.LoadXml(xmltext);
XmlNode rssnode = FindChildNode(doc, "rss");
rootnode = FindChildNode(rssnode, "channel");
GetItemsDetail();
}
catch (Exception e)
{
throw e;
}
}
/// <summary>
/// 释放所有资源
/// </summary>
public void Close()
{
items = null;
rootnode = null;
doc = null;
}
/// <summary>
/// 查找子节点
/// </summary>
/// <param name="node">父节点</param>
/// <param name="name">节点名称</param>
/// <returns>子节点</returns>
public XmlNode FindChildNode(XmlNode node, string name)
{
XmlNode childNode = null;
for (int i = 0; i < node.ChildNodes.Count; i++)
{
if (node.ChildNodes[i].Name == name &&
node.ChildNodes[i].ChildNodes.Count > 0)
{
childNode = node.ChildNodes[i];
return childNode;
}
}
return childNode;
}
/// <summary>
/// 获取item
/// </summary>
private void GetItemsDetail()
{
foreach (XmlNode n in rootnode)
{
if (n.Name == "item")
{
items.Add(n);
}
}
}
~RssReader()
{
try
{
}
catch (Exception e)
{
}
}
public static void Main()
{
RssReader rr = new RssReader();
rr.Load("http://top.baidu.com/rss/top10.xml");
string ss = rr[RssChannel.title];
string time = rr[0,RssItem.pubDate];
}
}
/// <summary>
/// RSS频道
/// </summary>
public enum RssChannel
{
/// <summary>
/// 标题
/// </summary>
title,
/// <summary>
/// 连接
/// </summary>
link,
/// <summary>
/// 描述
/// </summary>
description,
/// <summary>
/// 语言，可选
/// </summary>
language,
/// <summary>
/// 版权
/// </summary>
copyright,
/// <summary>
/// 内容发布者的邮件联系方式
/// </summary>
managingEditor,
/// <summary>
/// 网站管理员的邮件联系方式
/// </summary>
webMaster,
/// <summary>
/// 发布时间
/// </summary>
pubDate,
/// <summary>
/// 最后一次更新的时间
/// </summary>
lastBuildDate,
/// <summary>
/// 类别
/// </summary>
category,
/// <summary>
/// rss生成器的名称
/// </summary>
generator,
/// <summary>
/// Allows processes to register with a cloud to be notified
/// of updates to the channel, implementing a lightweight
/// publish-subscribe protocol for RSS feeds.
/// </summary>
cloud,
/// <summary>
/// ttl stands for time to live. It's a number of minutes
/// that indicates how long a channel can be cached before
/// refreshing from the source.
/// </summary>
ttl,
/// <summary>
/// Specifies a GIF, JPEG or PNG image that can be displayed with the channel.
/// </summary>
image,
/// <summary>
/// The PICS rating for the channel.
/// </summary>
rating,
/// <summary>
/// Specifies a text input box that can be displayed with the channel.
/// </summary>
textInput,
/// <summary>
/// A hint for aggregators telling them which hours they can skip.
/// </summary>
skipHours,
/// <summary>
/// A hint for aggregators telling them which days they can skip.
/// </summary>
skipDays
}
/// <summary>
/// RSS Item
/// </summary>
public enum RssItem
{
/// <summary>
/// 标题
/// </summary>
title,
/// <summary>
/// 连接
/// </summary>
link,
/// <summary>
/// 描述
/// </summary>
description,
/// <summary>
/// Email address of the author of the item.
/// </summary>
author,
/// <summary>
/// Includes the item in one or more categories.
/// </summary>
category,
/// <summary>
/// URL of a page for comments relating to the item.
/// </summary>
comments,
/// <summary>
/// Describes a media object that is attached to the item.
/// </summary>
enclosure,
/// <summary>
/// A string that uniquely identifies the item.
/// </summary>
guid,
/// <summary>
/// Indicates when the item was published.
/// </summary>
pubDate,
/// <summary>
/// The RSS channel that the item came from.
/// </summary>
source
}
/// <summary>
/// RSS中的图片项
/// </summary>
public enum RssImage
{
title,
link,
url
}
}
