Rss功能实现

不少网站都有rss订阅，本人没事也做了一下，你还别说，还有那个意思，本人自己的代码共享一下，希望对大家有所帮助
动态写入rss文件的函数

using System;

using System.IO;

using System.Data.SqlClient;

­

public partial class _Default : System.Web.UI.Page

{

    string filename =string.Empty;

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Genetatedrs(string filenames,string content)

    {

        try

        {

            FileStream fs = new FileStream(filenames, FileMode.OpenOrCreate, FileAccess.Write);

            StreamWriter sw = new StreamWriter(fs);

            sw.Write(content);

            sw.Close();

            fs.Close();

        }

        catch(Exception ee)

        {

            Response.Write("<script>alert('Generate successfully!');</script>");

        }

    }

    protected  string GetXML(int categoryid)

    {

        string XMLstring="";

        string sitehost = "http://www.hinet.com?";

        try

        {

            SqlConnection conn = new SqlConnection();

            conn.ConnectionString = "server=.;database=news;user id=*;password=*;";

            conn.Open();

            SqlCommand cmd = new SqlCommand();

            cmd.CommandText = "select * from Article_info where CategoryID=" + categoryid;

            cmd.Connection = conn;

            SqlDataReader dr = cmd.ExecuteReader();

            if (dr.Read())

            {

                XMLstring +=

                    string.Format(

                        "<?xml version='1.0' encoding='UTF-8' standalone='yes'?><rss version='2.0' xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:trackback='http://madskills.com/public/xml/rss/module/trackback/' xmlns:wfw='http://wellformedweb.org/CommentAPI/'><channel><title>{0}</title><link>{1}</link><description><![CDATA[{2}]]></description><generator>Text</generator><language>zh-CN</language><copyright>hinet</copyright><pubDate>{3}</pubDate>",

                        dr["Title"], sitehost, dr["Content"], DateTime.Now);

            }

­

            while (dr.Read())

            {

                XMLstring = XMLstring + "<item><title>" + dr["Title"] + "</title><author>" + dr["Author"] +

                            "</author><link>" + sitehost + "information.asp?i=" +

                            dr["InfoID"] + "</link><pubDate>" + dr["PublishDate"] + "</pubDate><guid>" + sitehost +

                            "information.asp?i=" + dr["InfoID"] + "</guid><description><![CDATA[" + dr["Content"] +

                            "]]></description><category>" + dr["CategoryID"] + "</category></item>";

­

            }

            XMLstring += "</channel></rss>";

        }

        catch(Exception dd)

        {

            Response.Write("<script>alert("+dd.Message+");</script>");

        }

        return XMLstring;

    }

  

­

    protected void Button1_Click(object sender, EventArgs e)

    {

        int categoryid = Convert.ToInt32(DropDownList1.SelectedValue);

        filename = @"F:\asp.net_generate_Rss\XMLnews_"+categoryid+".xml";

        string drs = GetXML(categoryid);

        Genetatedrs(filename, drs);    

    }

}

­