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Posted on 2006-08-30 16:55 Jerry Hu 阅读(897) 评论(17) 编辑 收藏 网摘
前段时间在写RSS Feed。
经过了几次的修改，把相关的代码写成了单独的类。
感觉重用时还算比较方便的。于是贴出来，大家一起研究研究。
以下是RssBase.cs类：
 
1 using System;
2using System.Collections.Generic;
3using System.Xml;
4
5namespace MyMedia.Utilities
6 {
7 public class RssBase
8  {
9 RssBase constructor#region RssBase constructor
10 public RssBase(XmlTextWriter rssWriter)
11 {
12 this.rssWriter = rssWriter;
13 }
14 public RssBase(XmlTextWriter rssWriter, bool hasMedia, IList<ItemInfo> items)
15 {
16 this.rssWriter = rssWriter;
17 this.hasMedia = hasMedia;
18 this.items = items;
19 }
20 #endregion
21
22 [Serializable]
23 public sealed class ItemInfo
24 {
25 ItemInfo constructor#region ItemInfo constructor
26 public ItemInfo() { }
27 public ItemInfo(string itemTitle, string itemLink, string itemDescription, string itemPubDate, string itemAuthor, string itemGuid)
28 {
29 this.itemTitle = itemTitle;
30 this.itemLink = itemLink;
31 this.itemDescription = itemDescription;
32 this.itemAuthor = itemAuthor;
33 this.itemGuid = itemGuid;
34 this.itemPubDate = itemPubDate;
35 }
36 public ItemInfo(string itemTitle, string itemLink, string itemDescription, string itemPubDate, string itemAuthor,
37 string itemGuid, string mediaContentUrl, string mediaTitle, string mediaDescription,
38 string mediaThumbUrl, string mediaThumbWidth, string mediaThumbHeight, string mediaAuthor)
39 {
40 this.itemTitle = itemTitle;
41 this.itemLink = itemLink;
42 this.itemDescription = itemDescription;
43 this.itemPubDate = itemPubDate;
44 this.itemAuthor = itemAuthor;
45 this.itemGuid = itemGuid;
46 this.mediaContentUrl = mediaContentUrl;
47 this.mediaTitle = mediaTitle;
48 this.mediaDescription = mediaDescription;
49 this.mediaThumbUrl = mediaThumbUrl;
50 this.mediaThumbWidth = mediaThumbWidth;
51 this.mediaThumbHeight = mediaThumbHeight;
52 this.mediaAuthor = mediaAuthor;
53 }
54 #endregion
55
56 Internal item variables#region Internal item variables
57 // Item variables
58 private string itemTitle;
59 private string itemLink;
60 private string itemDescription;
61 private string itemPubDate = DateTime.Now.ToString("r");
62 private string itemDateTaken = DateTime.Now.ToString();
63 private string itemAuthor;
64 private string itemGuid;
65 // Media variables
66 private string mediaContentUrl;
67 private string mediaTitle;
68 private string mediaDescription;
69 private string mediaThumbUrl;
70 private string mediaThumbWidth;
71 private string mediaThumbHeight;
72 private string mediaAuthor;
73 #endregion
74
75 Item properties#region Item properties
76 public string ItemTitle
77 {
78 set { itemTitle = value; }
79 get { return itemTitle; }
80 }
81 public string ItemLink
82 {
83 set { itemLink = value; }
84 get { return itemLink; }
85 }
86 public string ItemDescription
87 {
88 set { itemDescription = value; }
89 get { return itemDescription; }
90 }
91 public string ItemPubDate
92 {
93 set { itemPubDate = value; }
94 get { return itemPubDate; }
95 }
96 public string ItemDateTaken
97 {
98 set { itemDateTaken = value; }
99 get { return itemDateTaken; }
100 }
101 public string ItemAuthor
102 {
103 set { itemAuthor = value; }
104 get { return itemAuthor; }
105 }
106 public string ItemGuid
107 {
108 set { itemGuid = value; }
109 get { return itemGuid; }
110 }
111 public string MediaContentUrl
112 {
113 set { mediaContentUrl = value; }
114 get { return mediaContentUrl; }
115 }
116 public string MediaTitle
117 {
118 set { mediaTitle = value; }
119 get { return mediaTitle; }
120 }
121 public string MediaDescription
122 {
123 set { mediaDescription = value; }
124 get { return mediaDescription; }
125 }
126 public string MediaThumbUrl
127 {
128 set { mediaThumbUrl = value; }
129 get { return mediaThumbUrl; }
130 }
131 public string MediaThumbWidth
132 {
133 set { mediaThumbWidth = value; }
134 get { return mediaThumbWidth; }
135 }
136 public string MediaThumbHeight
137 {
138 set { mediaThumbHeight = value; }
139 get { return mediaThumbHeight; }
140 }
141 public string MediaAuthor
142 {
143 set { mediaAuthor = value; }
144 get { return mediaAuthor; }
145 }
146 #endregion
147
148 }
149
150 Const string#region Const string
151 private const string TITLE = "MyMedia RSS";
152 private const string XMLNS_MEDIA = "http://www.MyWii.com.au";
153 private const string XMLNS_DC = "http://purl.org/dc/elements/1.1/";
154 private const string LINK = "http://www.MyWii.com.au/";
155 private const string DESCRIPTION = "description";
156 private const string LANGUAGE = "en-us";
157 private const string COPYRIGHT = "Copyright 2006";
158 private const string GENERATOR = "MyMedia RSS Generator";
159 private const string IMAGE_URL = "http://www.MyWii.com.au/img/main/feed.gif";
160 private const string IMAGE_TITLE = "MyWii";
161 private const string IMAGE_LINK = "http://www.MyWii.com.au";
162 private string PUB_DATE = DateTime.Now.ToString("r");
163 private string LAST_BUILD_DATE = DateTime.Now.ToString("r");
164
165 #endregion
166
167 Internal member variables#region Internal member variables
168 private XmlTextWriter rssWriter;
169 private bool hasMedia;
170 private IList<ItemInfo> items;
171 #endregion
172
173 Properties#region Properties
174 public XmlTextWriter RssWriter
175 {
176 set { rssWriter = value; }
177 get { return rssWriter; }
178 }
179 public bool HasMedia
180 {
181 set { hasMedia = value; }
182 get { return hasMedia; }
183 }
184 public IList<ItemInfo> Items
185 {
186 set { items = value; }
187 get { return items; }
188 }
189
190 #endregion
191
192 Private method#region Private method
193
194 private void WritePrologue()
195 {
196 rssWriter.WriteStartDocument();
197 rssWriter.WriteStartElement("rss");
198 rssWriter.WriteAttributeString("version", "2.0");
199 rssWriter.WriteAttributeString("xmlns:media", XMLNS_MEDIA);
200 rssWriter.WriteAttributeString("xmlns:dc", XMLNS_DC);
201 rssWriter.WriteString("\n ");
202 // Write in channel block
203 rssWriter.WriteStartElement("channel");
204 rssWriter.WriteString("\n ");
205 rssWriter.WriteElementString("title", TITLE);
206 rssWriter.WriteString("\n ");
207 rssWriter.WriteElementString("link", LINK);
208 rssWriter.WriteString("\n ");
209 rssWriter.WriteElementString("description", DESCRIPTION);
210 rssWriter.WriteString("\n ");
211 rssWriter.WriteElementString("pubDate", PUB_DATE);
212 rssWriter.WriteString("\n ");
213 rssWriter.WriteElementString("lastBuildDate", LAST_BUILD_DATE);
214 rssWriter.WriteString("\n ");
215 rssWriter.WriteElementString("language", LANGUAGE);
216 rssWriter.WriteString("\n ");
217 rssWriter.WriteElementString("copyright", COPYRIGHT);
218 rssWriter.WriteString("\n ");
219 rssWriter.WriteElementString("generator", GENERATOR);
220 rssWriter.WriteString("\n ");
221 // Write in image block
222 rssWriter.WriteStartElement("image");
223 rssWriter.WriteString("\n ");
224 rssWriter.WriteElementString("url", IMAGE_URL);
225 rssWriter.WriteString("\n ");
226 rssWriter.WriteElementString("title", IMAGE_TITLE);
227 rssWriter.WriteString("\n ");
228 rssWriter.WriteElementString("link", IMAGE_LINK);
229 rssWriter.WriteString("\n ");
230 rssWriter.WriteEndElement();
231 rssWriter.WriteString("\n ");
232 }
233
234 /**//// <summary>
235 /// Write in items
236 /// </summary>
237 private void WriteItem(ItemInfo item)
238 {
239 // Write in item block
240 rssWriter.WriteStartElement("item");
241 rssWriter.WriteString("\n ");
242 rssWriter.WriteElementString("title", item.ItemTitle);
243 rssWriter.WriteString("\n ");
244 rssWriter.WriteElementString("link", item.ItemLink);
245 rssWriter.WriteString("\n ");
246
247 rssWriter.WriteStartElement("description");
248 rssWriter.WriteString("\n ");
249 rssWriter.WriteCData(item.ItemDescription);
250 rssWriter.WriteString("\n ");
251 rssWriter.WriteEndElement();
252
253 rssWriter.WriteString("\n ");
254 rssWriter.WriteElementString("pubDate", item.ItemPubDate);
255 rssWriter.WriteString("\n ");
256 rssWriter.WriteElementString("dc:date.Taken", item.ItemDateTaken);
257 rssWriter.WriteString("\n ");
258 rssWriter.WriteElementString("author", item.ItemAuthor);
259 rssWriter.WriteString("\n ");
260 rssWriter.WriteStartElement("guid");
261 rssWriter.WriteAttributeString("isPermaLink", "false");
262 rssWriter.WriteString(item.ItemGuid);
263 rssWriter.WriteEndElement();
264
265
266 // Write item media here
267
268 }
269
270 /**//// <summary>
271 /// Write in item media
272 /// </summary>
273 /// <param name="item">ItemInfo item</param>
274 private void WriteItemMedia(ItemInfo item)
275 {
276 // Write in media
277 rssWriter.WriteString("\n ");
278 rssWriter.WriteStartElement("media:content");
279 rssWriter.WriteAttributeString("url", item.MediaContentUrl);
280 rssWriter.WriteAttributeString("type", "image/jpeg");
281 rssWriter.WriteEndElement();
282 rssWriter.WriteString("\n ");
283 rssWriter.WriteElementString("media:title", item.MediaTitle);
284 rssWriter.WriteString("\n ");
285 rssWriter.WriteStartElement("media:text");
286 rssWriter.WriteAttributeString("type", "html");
287 rssWriter.WriteString(item.MediaDescription);
288 rssWriter.WriteEndElement();
289 rssWriter.WriteString("\n ");
290 rssWriter.WriteStartElement("media:thumbnail");
291 rssWriter.WriteAttributeString("url", item.MediaThumbUrl);
292 rssWriter.WriteAttributeString("height", item.MediaThumbHeight);
293 rssWriter.WriteAttributeString("width", item.MediaThumbWidth);
294 rssWriter.WriteEndElement();
295 rssWriter.WriteString("\n ");
296 rssWriter.WriteStartElement("media:credit");
297 rssWriter.WriteAttributeString("role", "photographer");
298 rssWriter.WriteString(item.MediaAuthor);
299 rssWriter.WriteEndElement();
300 rssWriter.WriteString("\n ");
301
302 }
303
304 /**//// <summary>
305 /// Close item element
306 /// </summary>
307 private void WriteItemEnd()
308 {
309 rssWriter.WriteString("\n ");
310 rssWriter.WriteEndElement();
311 rssWriter.WriteString("\n ");
312 }
313
314 /**//// <summary>
315 /// Close all the elements
316 /// </summary>
317 private void WriteEnd()
318 {
319 rssWriter.WriteEndElement();
320 rssWriter.WriteString("\n");
321 rssWriter.WriteEndElement();
322 rssWriter.WriteEndDocument();
323 }
324
325 #endregion
326
327 /**//// <summary>
328 /// Write RSS feed
329 /// </summary>
330 public void WriteRSS()
331 {
332 WritePrologue();
333 foreach (ItemInfo info in items)
334 {
335 WriteItem(info);
336 if (hasMedia)
337 WriteItemMedia(info);
338 WriteItemEnd();
339 }
340 WriteEnd();
341 }
342 }
343 }然后使用一个FeedBase.cs类，调用上面的RssBase类中的方法和属性。代码如下。（该文件有改动，如要编译，需做相关修改）
1using System.Collections.Generic;
2using System.Configuration;
3using System.Data;
4using System.Text;
5using System.Web;
6using System.Web.UI;
7using System.Xml;
8
9
10public class FeedBase : Page
11{
12 public void GenerateRss()
13 {
14
15 IList<RssBase.ItemInfo> items = new List<RssBase.ItemInfo>();
16
17 // Populate items.
18 foreach (DataRow row in rows)
19 {
20 RssBase.ItemInfo item = new RssBase.ItemInfo(row["Title"].ToString(), "link", row["Description"].ToString(), row["PubDate"].ToString(), row["Author"].ToString(), "guid");
21 items.Add(item);
22 }
23
24 XmlTextWriter xmlWriter = new XmlTextWriter(Response.OutputStream,
25 Encoding.UTF8);
26
27 RssBase rssBase = new RssBase(xmlWriter, false, items);
28 rssBase.WriteRSS();
29
30 xmlWriter.Flush();
31 xmlWriter.Close();
32
33 Response.ContentEncoding = Encoding.UTF8;
34 Response.ContentType = "text/xml";
35 Response.Cache.SetCacheability(HttpCacheability.Public);
36
37 Response.End();
38 }
39
40}
41
42最后，只要新建一个feed.aspx文件，继承FeedBase类，调用该类中的GenerateRss()方法就可以轻松生成你所期望的RSS Feed :) 有什么建议和想法，请留言！
Feedback
@King_Boy_Hcc
最后一段话的意思是，创建aspx文件，然后在aspx.cs中继承FeedBase类。
using System;
public partial class RSS : FeedBase
{
protected void Page_Load(object sender, EventArgs e)
{
GenerateRss();
}
}
@shalala
Rss Toolkit 什么东东，推荐我用用。
早知有现成的东西，我又何必伤这么多脑细胞:(
hehe...我以为楼主会订阅www.asp.net的blog呢
是将什么转化为rssfeed?
将一个.aspx文件转化为rssFeed?
是用XmlTextWriter直接输出
XmlTextWriter xmlWriter = new XmlTextWriter(Response.OutputStream, Encoding.UTF8);
// ... 生成rss
xmlWriter.Flush();
xmlWriter.Close();
Response.ContentEncoding = Encoding.UTF8;
Response.ContentType = "text/xml";
Response.Cache.SetCacheability(HttpCacheability.Public);
foreach (DataRow row in rows)
这句是怎么来的啊
foreach (DataRow row in rows)
-----------------------------
我可能删除了部分代码
这里原本应该是一个你自己生成的DataTable
比如从数据库db.News获取最新的新闻DataTable news = GetLatestNews().
然后就可以用foreach (DataRow row in news.rows)
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