此错误在rss的xml生成器中 [英] this error is in xml generator for rss

问题描述

protected void Page_Load(object sender, EventArgs e)
        {
            Response.ContentType = "text/xml";
            Response.ContentEncoding = Encoding.UTF8;
            if (Cache["RssFeed"] == null)
            {
               
                ConnectionManager cm = new ConnectionManager();
                cm.Command.CommandText = "select Title,TitleSimplified,ImageMainURL,URL,Description,InsertDate from tblFeedsItems";
                cm.Command.CommandType = CommandType.Text;
                cm.Connection.Open();
                SqlDataReader dr = cm.Command.ExecuteReader();
                DataTable articleData  = new DataTable("articleData");
                articleData.Load(dr);
               
                StringWriter sw = new StringWriter();
                XmlTextWriter writer = new XmlTextWriter(sw);

                writer.WriteStartElement("rss");
                writer.WriteAttributeString("version","2.0");

                writer.WriteStartElement("channel");

                writer.WriteElementString("title","Example RSS Title");
                writer.WriteElementString("link","http://example.com/");
                writer.WriteElementString("description","This is a demonstration RSS feed");
                writer.WriteElementString("ttl","60");

                const int RSS_Items = 10;
                for (int i=0; i < RSS_Items; i++)
                {
                    writer.WriteStartElement("item");

                    writer.WriteElementString("Title", articleData.Rows[i]["Title"].ToString());
                    writer.WriteElementString("link", articleData.Rows[i]["URL"].ToString());
                    writer.WriteElementString("description", articleData.Rows[i]["Description"].ToString());
                    writer.WriteElementString("pubDate", (articleData.Rows[i]["InsertDate"].ToString()));

                    writer.WriteEndElement();
                }
                writer.WriteEndElement();

                writer.WriteEndElement();


                Cache.Insert("RssFeed",sw.ToString(),null,DateTime.Now.AddHours(1.5),TimeSpan.Zero);
                writer.Close();
            }

            Response.Write(Cache["RssFeed"].ToString());
        }

并在运行时出现此错误：

and give this error when i Run it :

This page contains the following errors:

error on line 3 at column 1: Extra content at the end of the document
Below is a rendering of the page up to the first error.

plz帮帮我：（

plz help me :(

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