Web 2.0时代RSS的.Net实现

2024-07-10 13:10:27

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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}