【IT168 技术文档】Web.时是以Blog，Wike，Tag，RSS等技术为代表的以个性化为中心的新一代互联网模式，RSS比起Blog等名词似乎还不算太热。但打开网页仍是遍布了RSS,Xml等醒目的图标，打开页面Mathon浏览器也是一个劲的提示有新的RSS连接，前一段一个项目需要，自己写了一个.Net下面生成RSS信息的类，如下：

using System;
using System.Xml;
using System.Collections;
using System.Globalization;
using System.Web;

namespace BLRL
...{
/**//// <summary>
 /// Summary description for Rss.
 /// </summary>
 public class Rss
 ...{
 const string dublinCoreNamespaceUri = @"http://purl.org/dc/elements/./";
 const string slashNamespaceUri = @"http://purl.org/rss/./modules/slash/";
 const string syndicationNamespaceUri = @"http://purl.org/rss/./modules/syndication/";
 //RSS频道结构
 struct RssChannel
 ...{
 public string title;//标题
 public string link;//连接
 public string language;//语言
 public string description;//描述
 public string webMaster;//发布者
 }

 //RSS图片信息
 struct RssImage
 ...{
 public string url;//地址
 public string title;//标题
 public int height ;//高度
 public int width;//长度
 }

 //RSS项结构
 struct RssItem
 ...{
 public string title;//标题
 public string catalog;//类别
 public string link;//连接
 public DateTime pubDate;//发布日期
 public string description;//描述

 }
 public Rss()
 ...{
 //
 // TODO: Add constructor logic here
 //
 }
 /**//// <summary>
 ///添加rss版本信息
 /// </summary>
 /// <param name="xmlDocument"></param>
 /// <returns></returns>
 public static XmlDocumentAddRssPreamble( XmlDocument xmlDocument)
 ...{
 //声明创建.版本得xml
 XmlDeclaration xmlDeclaration = xmlDocument.CreateXmlDeclaration(".", "utf-", null);
 xmlDocument.InsertBefore(xmlDeclaration, xmlDocument.DocumentElement);

 XmlElement rssElement = xmlDocument.CreateElement("rss");

 XmlAttribute rssVersionAttribute = xmlDocument.CreateAttribute("version");
 rssVersionAttribute.InnerText = ".";
 rssElement.Attributes.Append(rssVersionAttribute);
 xmlDocument.AppendChild(rssElement);


 XmlAttribute dublicCoreNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:dc");
 dublicCoreNamespaceUriAttribute.InnerText = dublinCoreNamespaceUri;
 rssElement.Attributes.Append(dublicCoreNamespaceUriAttribute);

 XmlAttribute slashNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:slash");
 slashNamespaceUriAttribute.InnerText = slashNamespaceUri;
 rssElement.Attributes.Append(slashNamespaceUriAttribute);

 XmlAttribute syndicationNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:sy");
 syndicationNamespaceUriAttribute.InnerText = syndicationNamespaceUri;
 rssElement.Attributes.Append(syndicationNamespaceUriAttribute);


 return xmlDocument;
 }

 /**//// <summary>
 /// 添加频道
 /// </summary>
 /// <param name="xmlDocument"></param>
 /// <param name="channel"></param>
 /// <returns></returns>
 private static XmlDocument AddRssChannel( XmlDocument xmlDocument, RssChannel channel)
 ...{
 XmlElement channelElement = xmlDocument.CreateElement("channel");
 XmlNode rssElement = xmlDocument.SelectSingleNode("rss");

 rssElement.AppendChild(channelElement);

//添加标题
XmlElement channelTitleElement = xmlDocument.CreateElement("title");
channelTitleElement.InnerText = channel.title;
channelElement.AppendChild(channelTitleElement);

//添加连接
XmlElement channelLinkElement = xmlDocument.CreateElement("link");
channelLinkElement.InnerText = channel.link;
channelElement.AppendChild(channelLinkElement);

//添加描述
XmlElement channelDescriptionElement = xmlDocument.CreateElement("description");
XmlCDataSection cDataDescriptionSection = xmlDocument.CreateCDataSection(channel.description);
channelDescriptionElement.AppendChild(cDataDescriptionSection);
channelElement.AppendChild(channelDescriptionElement);

//添加语言
XmlElement languageElement = xmlDocument.CreateElement("language");
languageElement.InnerText = channel.language;
channelElement.AppendChild(languageElement);

//添加发布者
XmlElement webMasterElement = xmlDocument.CreateElement("webMaster");
webMasterElement.InnerText = channel.webMaster;
channelElement.AppendChild(webMasterElement);

return xmlDocument;
}


//添加RssImage
private static XmlDocument AddRssImage(XmlDocument xmlDocument, RssImage img)
...{
XmlElement imgElement = xmlDocument.CreateElement("image");
XmlNode channelElement = xmlDocument.SelectSingleNode("rss/channel");

//创建标题
XmlElement imageTitleElement = xmlDocument.CreateElement("title");
imageTitleElement.InnerText = img.title;
imgElement.AppendChild(imageTitleElement);

//创建地址
XmlElement imageUrlElement = xmlDocument.CreateElement("url");
imageUrlElement.InnerText = img.url;
imgElement.AppendChild(imageUrlElement);

//创建高度
XmlElement imageHeightElement = xmlDocument.CreateElement("height");
imageHeightElement.InnerText = img.height.ToString();
imgElement.AppendChild(imageHeightElement);

//创建长度
XmlElement imageWidthElement = xmlDocument.CreateElement("width");
imageWidthElement.InnerText = img.width.ToString();
imgElement.AppendChild(imageWidthElement);

//将图像节点添加到频道节点里面
channelElement.AppendChild(imgElement);
return xmlDocument;

}


/**//// <summary>
/// 添加项信息
/// </summary>
/// <param name="xmlDocument"></param>
/// <param name="item"></param>
/// <returns></returns>
private static XmlDocument AddRssItem (XmlDocument xmlDocument, RssItem item)
...{
XmlElement itemElement = xmlDocument.CreateElement("item");
XmlNode channelElement = xmlDocument.SelectSingleNode("rss/channel");

//创建标题
XmlElement itemTitleElement = xmlDocument.CreateElement("title");
XmlCDataSection cDataTitleSection = xmlDocument.CreateCDataSection(item.title);
itemTitleElement.AppendChild(cDataTitleSection);
itemElement.AppendChild(itemTitleElement);

//创建日期
XmlElement pubDateElement = xmlDocument.CreateElement("pubDate");
pubDateElement.InnerText = XmlConvert.ToString(item.pubDate.ToUniversalTime(), "yyyy-MM-ddTHH:mm:ss");
itemElement.AppendChild(pubDateElement);

//添加连接
XmlElement itemLinkElement = xmlDocument.CreateElement("link");
itemLinkElement.InnerText = item.link;
itemElement.AppendChild(itemLinkElement);

//创建描述
XmlElement itemDescriptionElement = xmlDocument.CreateElement("description");
XmlCDataSection cDataDescriptionSection = xmlDocument.CreateCDataSection(item.description);
itemDescriptionElement.AppendChild(cDataDescriptionSection);
itemElement.AppendChild(itemDescriptionElement);


//创建类型
XmlElement itemcatalogElement = xmlDocument.CreateElement("catalog");
itemcatalogElement.InnerText = item.catalog;
itemElement.AppendChild(itemcatalogElement);

//将RssItem添加到频道节点里面
channelElement.AppendChild(itemElement);

return xmlDocument;
}
 }
}

    根据特定的需要，可以先将数据读取到列表里面，然后遍历列表，调用上述方法，生成Xml字符串。

    这个字符串就是RS用到XML字符串了。也可以入aspx文件，然后用 <link type="application/rss+xml" rel="alternate" href="rssfeed.aspx">调用下RSS文件，软件就会自动提示有RRS信息了。