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ASP.NET 生成 RSS Feed

 2006-08-31 17:13:36 来源:WEB开发网   
核心提示:前段时间在写rss Feed,经过了几次的修改,ASP.NET 生成 RSS Feed,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,只要新建一个feed.aspx文件,继承FeedBase类,于是贴出来,大家一起研究研究

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!

http://www.cnblogs.com/jerryhu/archive/2006/08/30/490544.html

Tags:ASP NET 生成

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