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用.NET生成RSS文件,以便Rss阅读器订阅（转）

2009-08-27 01:16 477 查看

2009-08-14 11:24

GetRss.cs类

using System;
using System.Collections.Generic;
using System.Web;
using System.Data;
using System.Configuration;

using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

using System.IO;

/// <summary>
///GetRss 的摘要说明
/// </summary>
public class GetRss
{
/// <summary>
/// 根据文件路径写RSS文件
/// </summary>
/// <remarks>
/// 例如:
/// WriteRss("D:Vs2005GenerateRssRSS_Folder est_tb.xml","test_tb")
/// 注意：根据表的结构,需要调整生成的RSS源。本实例仅供测试用。
/// </remarks>
/// <param name="pathfilename">文件路径</param>
/// <param name="tablename">表名</param>
/// <returns>true or false</returns>
public static bool WriteRss(string pathfilename, string tablename)
{
try
{
FileInfo finfo = new FileInfo(pathfilename);
finfo.Delete();//先删除旧的

using (FileStream fs = finfo.OpenWrite())
{
StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.GetEncoding("UTF-8"));
sw.WriteLine(GetRss.GetRSSString(tablename));
sw.Flush();
sw.Close();
}
return true;
}
catch (System.Exception ex)
{
System.Web.HttpContext.Current.Response.Write(ex.Message);
return false;
throw;
}

}

/// <summary>
/// 组织符合最新标准的RSS字符串
/// 参数：表名。
/// </summary>
/// <remarks>
/// 例如:
/// GetRSS()
/// 注意：根据表的结构,需要调整生成的RSS源。本实例仅供测试用。
/// </remarks>
/// <param name="tablename">表名</param>
/// <returns>返回一个DataSet 数据源</returns>
public static string GetRSSString(string Tablename)
{
try
{
DataSet ds =common.RunQuery("select * from tb_news");//common.RunQuery函数为自定查询函数，请自行定义。
string strRSS = "";
strRSS = strRSS + "<?xml version=\"1.0\"?> " + System.Environment.NewLine;
strRSS = strRSS + "<rss xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance/"" + System.Environment.NewLine;
strRSS = strRSS + " xmlns:xsd=\"http://www.w3.org/2001/XMLSchema/" " + System.Environment.NewLine;
strRSS = strRSS + " xmlns:slash=\"http://purl.org/rss/1.0/modules/slash//" version=\"2.0\">" + System.Environment.NewLine;
strRSS = strRSS + "<channel>" + System.Environment.NewLine;
strRSS = strRSS + "<title>订阅标题</title> " + System.Environment.NewLine;
strRSS = strRSS + "<link>http://www.Hellocom.cn/</link>" + System.Environment.NewLine;
strRSS = strRSS + "<description>描述信息</description>" + System.Environment.NewLine;
strRSS = strRSS + "<language>zh-CN</language>" + System.Environment.NewLine;
strRSS = strRSS + "<generator>www.Hellocom.cn</generator> " + System.Environment.NewLine;
strRSS = strRSS + "<copyright>北京Hello公司</copyright> " + System.Environment.NewLine;
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
strRSS = strRSS + "<item>" + System.Environment.NewLine;
strRSS = strRSS + "<title>" + ds.Tables[0].Rows[i]["cname"] + "</title> " + System.Environment.NewLine;
strRSS = strRSS + "<link>http://www.Hello.com.cn/newsdetail/" + ds.Tables[0].Rows[i]["cid"] + ".html</link> " + System.Environment.NewLine;
strRSS = strRSS + "<author /> " + System.Environment.NewLine;
strRSS = strRSS + "<guid>http://www.Hello.com.cn/newsdetail/" + ds.Tables[0].Rows[i]["cid"] + ".html</guid> " + System.Environment.NewLine;
strRSS = strRSS + "<pubDate>" + Convert.ToDateTime(ds.Tables[0].Rows[i]["ctime"].ToString()).ToString("yyyy-MM-dd HH:mm") + "</pubDate> " + System.Environment.NewLine;
strRSS = strRSS + "<comments>http://www.Hello.com.cn/newsdetail/" + ds.Tables[0].Rows[i]["cid"] + ".html</comments> " + System.Environment.NewLine;
strRSS = strRSS + "<slash:comments>0</slash:comments> " + System.Environment.NewLine;
strRSS = strRSS + "<source url=\"http://www.Hello.com.cn/newsdetail/" + ds.Tables[0].Rows[i]["cid"] + ".html\">" + ds.Tables[0].Rows[i]["cname"] + "</source> " + System.Environment.NewLine;
strRSS = strRSS + "<description>" + ds.Tables[0].Rows[i]["cname"] + "</description>" + System.Environment.NewLine;
strRSS = strRSS + "</item>" + System.Environment.NewLine;
}
strRSS = strRSS + "</channel>" + System.Environment.NewLine;
strRSS = strRSS + "</rss>" + System.Environment.NewLine;
return strRSS;
}
catch (Exception ex)
{
System.Web.HttpContext.Current.Response.Write(ex.Message);
throw;
}
}

}

===========================================================================

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

</div>
</form>
</body>
</html>
===========================================================================

Default.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string msg="生成成功！";
string Tablename = "News"; //Request.QueryString["TableName"];
string fname = System.Web.HttpContext.Current.Server.MapPath("RSS_Folder") + "\\" + Tablename + ".XML";
try
{
GetRss.WriteRss(fname, Tablename);
}
catch (System.Exception e11)
{
msg="生成时出错!";
}

common.MsgBox(msg);

}
}

===========================================================================

建一个文件夹：RSS_Folder

===========================================================================

common类中的 RunQuery函数

//运行查询
public static DataSet RunQuery(String QueryString)
{

// 声明连接字符串。本示例使用oledb
//连接到#ZNaboodatabak_En.mdb数据库

OleDbConnection DBConnection = common.getConn();
OleDbDataAdapter DBAdapter;
DataSet ResultsDataSet = new DataSet();

try
{

//运行查询并建立一个数据集
DBAdapter = new OleDbDataAdapter(QueryString, DBConnection);
DBAdapter.Fill(ResultsDataSet);

//关闭数据库连接
DBConnection.Close();

}
catch (Exception ex)
{

//如果数据库连接仍然打开则关闭它
if (DBConnection.State == ConnectionState.Open)
{
DBConnection.Close();
}
//MsgBox("无法连接到数据库!");
//System.Web.HttpContext.Current.Response.Write("<script>history.back(1);</script>");
//System.Web.HttpContext.Current.Response.Write(QueryString+"<br/>");
//System.Web.HttpContext.Current.Response.Write(ex);
//System.Web.HttpContext.Current.Response.End();

}

return ResultsDataSet;

}

http://hi.baidu.com/nirvanan/blog/item/a822e3cce2852d580fb3458b.html

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