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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：
1using 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！
