Web2.0时代RSS的.Net实现

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Web2.0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：

1using System;
2using System.Xml;
3using System.Collections;
4using System.Globalization;
5using System.Web;
6
7namespace BLRL
8{
9 /// <summary>
10 /// Summary description for RSS.
11 /// </summary>
12 public class RSS
13 {
14 const string dublinCoreNamespaceUri = @"http://purl.org/dc/elements/1.1/";
15 const string slashNamespaceUri = @"http://purl.org/RSS/1.0/modules/slash/";
16 const string syndicationNamespaceUri = @"http://purl.org/RSS/1.0/modules/syndication/";
17 //RSS频道结构
18 struct RSSChannel
19 {
20 public string title;//标题
21 public string link;//连接
22 public string language;//语言
23 public string description;//描述
24 public string WebMaster;//发布者
25 }
26
27 //RSS图片信息
28 struct RSSImage
29 {
30 public string url;//地址
31 public string title;//标题
32 public int height ;//高度
33 public int width;//长度
34 }
35
36 //RSS项结构
37 struct RSSItem
38 {
39 public string title;//标题
40 public string catalog;//类别
41 public string link;//连接
42 public DateTime pubDate;//发布日期
43 public string description;//描述
44
45 }
46 public RSS()
47 {
48 //
49 // TODO: Add constructor logic here
50 //
51 }
52 /// <summary>
53 ///添加RSS版本信息
54 /// </summary>
55 /// <param name="xmlDocument"></param>
56 /// <returns></returns>
57 public static XmlDocument AddRSSPreamble( XmlDocument xmlDocument)
58 {
59 //声明创建1.0版本得xml
60 XmlDeclaration xmlDeclaration = xmlDocument.CreateXmlDeclaration("1.0", "utf-8", null);
61 xmlDocument.InsertBefore(xmlDeclaration, xmlDocument.DocumentElement);
62
63 XmlElement RSSElement = xmlDocument.CreateElement("RSS");
64
65 XmlAttribute RSSVersionAttribute = xmlDocument.CreateAttribute("version");
66 RSSVersionAttribute.InnerText = "2.0";
67 RSSElement.Attributes.Append(RSSVersionAttribute);
68 xmlDocument.AppendChild(RSSElement);
69
70
71 XmlAttribute dublicCoreNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:dc");
72 dublicCoreNamespaceUriAttribute.InnerText = dublinCoreNamespaceUri;
73 RSSElement.Attributes.Append(dublicCoreNamespaceUriAttribute);
74
75 XmlAttribute slashNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:slash");
76 slashNamespaceUriAttribute.InnerText = slashNamespaceUri;
77 RSSElement.Attributes.Append(slashNamespaceUriAttribute);
78
79 XmlAttribute syndicationNamespaceUriAttribute = xmlDocument.CreateAttribute("xmlns:sy");
80 syndicationNamespaceUriAttribute.InnerText = syndicationNamespaceUri;
81 RSSElement.Attributes.Append(syndicationNamespaceUriAttribute);
82
83
84 return xmlDocument;
85 }
86
87 /// <summary>
88 /// 添加频道
89 /// </summary>
90 /// <param name="xmlDocument"></param>
91 /// <param name="channel"></param>
92 /// <returns></returns>
93 private static XmlDocument AddRSSChannel( XmlDocument xmlDocument, RSSChannel channel)
94 {
95 XmlElement channelElement = xmlDocument.CreateElement("channel");
96 XmlNode RSSElement = xmlDocument.SelectSingleNode("RSS");
97
98 RSSElement.AppendChild(channelElement);
99
100 //添加标题
101 XmlElement channelTitleElement = xmlDocument.CreateElement("title");
102 channelTitleElement.InnerText = channel.title;
103 channelElement.AppendChild(channelTitleElement);
104
105 //添加连接
106 XmlElement channelLinkElement = xmlDocument.CreateElement("link");
107 channelLinkElement.InnerText = channel.link;
108 channelElement.AppendChild(channelLinkElement);
109
110 //添加描述
111 XmlElement channelDescriptionElement = xmlDocument.CreateElement("description");
112 XmlCDataSection cDataDescriptionSection = xmlDocument.CreateCDataSection(channel.description);
113 channelDescriptionElement.AppendChild(cDataDescriptionSection);
114 channelElement.AppendChild(channelDescriptionElement);
115
116 //添加语言
117 XmlElement languageElement = xmlDocument.CreateElement("language");
118 languageElement.InnerText = channel.language;
119 channelElement.AppendChild(languageElement);
120
121 //添加发布者
122 XmlElement WebMasterElement = xmlDocument.CreateElement("WebMaster");
123 WebMasterElement.InnerText = channel.WebMaster;
124 channelElement.AppendChild(WebMasterElement);
125
126 return xmlDocument;
127 }
128
129
130 //添加RSSImage
131 private static XmlDocument AddRSSImage(XmlDocument xmlDocument, RSSImage img)
132 {
133 XmlElement imgElement = xmlDocument.CreateElement("image");
134 XmlNode channelElement = xmlDocument.SelectSingleNode("RSS/channel");
135
136 //创建标题
137 XmlElement imageTitleElement = xmlDocument.CreateElement("title");
138 imageTitleElement.InnerText = img.title;
139 imgElement.AppendChild(imageTitleElement);
140
141 //创建地址
142 XmlElement imageUrlElement = xmlDocument.CreateElement("url");
143 imageUrlElement.InnerText = img.url;
144 imgElement.AppendChild(imageUrlElement);
145
146 //创建高度
147 XmlElement imageHeightElement = xmlDocument.CreateElement("height");
148 imageHeightElement.InnerText = img.height.ToString();
149 imgElement.AppendChild(imageHeightElement);
150
151 //创建长度
152 XmlElement imageWidthElement = xmlDocument.CreateElement("width");
153 imageWidthElement.InnerText = img.width.ToString();
154 imgElement.AppendChild(imageWidthElement);
155
156 //将图像节点添加到频道节点里面
157 channelElement.AppendChild(imgElement);
158 return xmlDocument;
159
160 }
161
162
163 /// <summary>
164 /// 添加项信息
165 /// </summary>
166 /// <param name="xmlDocument"></param>
167 /// <param name="item"></param>
168 /// <returns></returns>
169 private static XmlDocument AddRSSItem (XmlDocument xmlDocument, RSSItem item)
170 {
171 XmlElement itemElement = xmlDocument.CreateElement("item");
172 XmlNode channelElement = xmlDocument.SelectSingleNode("RSS/channel");
173
174 //创建标题
175 XmlElement itemTitleElement = xmlDocument.CreateElement("title");
176 XmlCDataSection cDataTitleSection = xmlDocument.CreateCDataSection(item.title);
177 itemTitleElement.AppendChild(cDataTitleSection);
178 itemElement.AppendChild(itemTitleElement);
179
180 //创建日期
181 XmlElement pubDateElement = xmlDocument.CreateElement("pubDate");
182 pubDateElement.InnerText = XmlConvert.ToString(item.pubDate.ToUniversalTime(), "yyyy-MM-ddTHH:mm:ss");
183 itemElement.AppendChild(pubDateElement);
184
185 //添加连接
186 XmlElement itemLinkElement = xmlDocument.CreateElement("link");
187 itemLinkElement.InnerText = item.link;
188 itemElement.AppendChild(itemLinkElement);
189
190 //创建描述
191 XmlElement itemDescriptionElement = xmlDocument.CreateElement("description");
192 XmlCDataSection cDataDescriptionSection = xmlDocument.CreateCDataSection(item.description);
193 itemDescriptionElement.AppendChild(cDataDescriptionSection);
194 itemElement.AppendChild(itemDescriptionElement);
195
196
197 //创建类型
198 XmlElement itemcatalogElement = xmlDocument.CreateElement("catalog");
199 itemcatalogElement.InnerText = item.catalog;
200 itemElement.AppendChild(itemcatalogElement);
201
202 //将RSSItem添加到频道节点里面
203 channelElement.AppendChild(itemElement);
204
205 return xmlDocument;
206 }
207 }
208}
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，马桶等软件就会自动提示有RRS信息了

http://jillzhang.cnblogs.com/archive/2006/06/11/423086.html