using System.IO;
using System.Xml;
using System.Net;
public int viewcount = 5;
public int viewtitlecount = 10;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
RepOne.DataSource = viewInfo("http://www.youku.com/index/rss_cool_v/",viewcount,viewtitlecount);
RepOne.DataBind();
RepTwo.DataSource = viewInfo("http://news.baidu.com/n?cmd=1&class=housenews&tn=rss&sub=0", viewcount, viewtitlecount);
RepTwo.DataBind();
RepThree.DataSource = viewInfo("http://rss.sina.com.cn/news/marquee/ddt.xml", viewcount, viewtitlecount);
RepThree.DataBind();
RepFour.DataSource = viewInfo("http://rss.business.sohu.com/rss/caijingpinglun.xml", viewcount, viewtitlecount);
RepFour.DataBind();
RepFive.DataSource = viewInfo("http://www.cnblogs.com/nova_zhang/rss", viewcount, viewtitlecount);
RepFive.DataBind();
RepSix.DataSource = viewInfo("http://ent.163.com/special/00031K7Q/rss_toutiao.xml", viewcount, viewtitlecount);
RepSix.DataBind();
RepSeven.DataSource = viewInfo("http://bbs.linmiaoke.com/rss.php?auth=ba7dkXNDhwrD2J9npBuImRw4CWJkzjGRxHQsECan0T%2B7YeixcGAzhKW%2Fkg", viewcount, viewtitlecount);
RepSeven.DataBind();
}
}
// viewInfo
private DataTable viewInfo(string url,int totalcount,int titlecount)
{
try
{
//使用rssURL的值建立了一个WebRequest对象
WebRequest myRequest = WebRequest.Create(url);
//这个请求的响应将会被放到一个WebResponse对象里
WebResponse myResponse = myRequest.GetResponse();
//然后这个WebResponse对象被用来建立一个流来取出XML的值
Stream rssStream = myResponse.GetResponseStream();
//然后可以使用一个XmlDocument对象来存储流中的XML内容。XmlDocument对象用来调入XML的内容：
XmlDocument rssDoc = new XmlDocument();
//因为RSS Feed不只是一个XML文件，我们可以假设里面包含了一些RSS标准的规定。这里，我们假设使用了RSS 2.0
rssDoc.Load(rssStream);
DataTable dt = new DataTable();
dt.Columns.Add("title", typeof(string));
dt.Columns.Add("link", typeof(string));
dt.Columns.Add("pubDate", typeof(string));
//dt.Columns.Add("description", typeof(string));
//具体的来说，每个项应该在rss/channel/里。使用XPath表达，一个项节点列表可以如下方式创建
XmlNodeList rssItems = rssDoc.SelectNodes("rss/channel/item");
if (rssItems.Count < totalcount)
{
totalcount = rssItems.Count;
}
for (int i = 0; i < totalcount; i++)
{
DataRow row = dt.NewRow();
//rssItems存储了从RSS里获得所有项节点的信息。这样就可取得内部所需要的信息了。这里，标题、链接和每个项的描述将会被显示。在rssItems中存储的每个项，每个标记（tag）元素都可以用SelectSingleNode方法提取出来。返回的值将被赋给一个XMLNode对象。以下代码获取了一个标题节点
XmlNode rsstitle = rssItems.Item(i).SelectSingleNode("title");
XmlNode rsslink = rssItems.Item(i).SelectSingleNode("link");
XmlNode rsspubdate = rssItems.Item(i).SelectSingleNode("pubDate");
//XmlNode rssdescription = rssItems.Item(i).SelectSingleNode("description");
string title = rsstitle.InnerText;
string link = rsslink.InnerText;
string pubdate = rsspubdate.InnerText;
//string description = rssdescription.InnerText;
if (title.Length < 1)
{
title = rsstitle.InnerXml;
}
if (link.Length < 1)
{
link = rsslink.InnerXml;
}
if (pubdate.Length < 1)
{
pubdate = rsspubdate.InnerXml;
}
//if (description.Length < 1)
//{
// description = rssdescription.InnerXml;
//}
title = title.Replace("<![CDATA[", "");
title = title.Replace("]]>", "");
if (title.Length > titlecount)
{
title = MySubstring.mysubstr(title, titlecount * 2) +"...";
}
link = link.Replace("<![CDATA[", "");
link = link.Replace("]]>", "");
pubdate = pubdate.Replace("<![CDATA[", "");
pubdate = pubdate.Replace("]]>", "");
pubdate = DateTime.Parse(pubdate).ToString("yyyy-MM-dd hh:mm:ss");
//description = description.Replace("<![CDATA[", "");
//description = description.Replace("]]>", "");
row["title"] = "<a href='" + link + "' target='_blank'>" + title + "</a>";
row["link"] = "<a href='" + link + "' target='_blank'>" + link + "</a>";
row["pubDate"] = "<a href='" + link + "' target='_blank'>" + pubdate + "</a>";
//row["description"] = "<a href='" + link + "' target='_blank'>" + description + "</a>";
dt.Rows.Add(row);
}
return dt;
}
catch
{
return null;
}
}
/// <summary>
///MySubstring 的摘要说明
/// </summary>
public static class MySubstring
{
public static string mysubstr(this string s, int length)
{
byte[] bytes = System.Text.Encoding.Unicode.GetBytes(s);
int n = 0; // 表示当前的字节数
int i = 0; // 要截取的字节数
for (; i < bytes.GetLength(0) && n < length; i++)
{
// 偶数位置，如0、2、4等，为UCS2编码中两个字节的第一个字节
if (i % 2 == 0)
{
n++; // 在UCS2第一个字节时n加1
}
else
{
// 当UCS2编码的第二个字节大于0时，该UCS2字符为汉字，一个汉字算两个字节
if (bytes[i] > 0)
{
n++;
}
}
}
// 如果i为奇数时，处理成偶数
if (i % 2 == 1)
{
// 该UCS2字符是汉字时，去掉这个截一半的汉字
if (bytes[i] > 0)
i = i - 1;
// 该UCS2字符是字母或数字，则保留该字符
else
i = i + 1;
}
return System.Text.Encoding.Unicode.GetString(bytes, 0, i);
}
}
/Files/nova_zhang/RSS2.0基本入门.pdf