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I am making a web application that takes RSS feeds from websites(URLs are in database) and then loads them into my web application. But I am getting this error
System.Xml.XmlException: Root element is missing. root element is missing. at line : rssdoc.load(rssStream);
Exception Details: System.Xml.XmlException: There are multiple root elements. Line 2, position 2. so how to encapsulate everything else by single xml element
Here is my code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
using System.Net;
using System.Text;
using System.IO;
using System.Data;
using System.Data.SqlClient;
public partial class poletics : System.Web.UI.Page
{
public SqlConnection oldbcon = new SqlConnection();
static int n = 0;
static DataTable dt = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
oldbcon = opncon();
using (oldbcon)
{
SqlDataAdapter ad = new SqlDataAdapter("SELECT * from LebPolRss", oldbcon);
ad.Fill(dt);
}
int f = 3;
while (n < f)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Literal feed = new Literal();
try
{
feed.Text = ProcessRss(dt.Rows[i][3].ToString(), dt.Rows[i][4].ToString());
}
catch (WebException ex)
{
WebResponse response = ex.Response;
}
Panel1.Controls.Add(feed);
}
n++;
}
}
public static string ProcessRss(string rssUrl, string feed)
{
WebRequest request = WebRequest.Create(rssUrl);
WebResponse response = request.GetResponse();
StringBuilder sb = new StringBuilder("");
Stream rssStream = response.GetResponseStream();
XmlDocument rssDoc = new XmlDocument();
rssDoc.Load(rssStream);//here is the line where the exception thrown
XmlNodeList rssItems = rssDoc.SelectNodes("rss/channel/item");
string title = "";
string link = "";
string description = "";
int upperlimit = rssItems.Count;
if (upperlimit > n)
upperlimit = n + 1;
if (upperlimit > 0)
{
sb.Append("<ul>");
for (int i = 0; i < upperlimit - n; i++)
{
XmlNode rssDetail;
rssDetail = rssItems.Item(i + n).SelectSingleNode("title");
if (rssDetail != null)
{
if (feed.ToString().Equals("tayyar"))
{
title = rssDetail.InnerText.Substring(5);
}
else
{
if (rssDetail.InnerText.Length > 75)
{
title = rssDetail.InnerText.Substring(0, 75);
}
else
{
title = rssDetail.InnerText;
}
}
}
else
{
title = "";
}
rssDetail = rssItems.Item(i + n).SelectSingleNode("link");
if (rssDetail != null)
{
if (feed.ToString().Equals("tayyar"))
{
if (rssDetail.InnerText.Substring(0, 21).CompareTo("http://www.tayyar.org") != 0)
{
link = "http://www.tayyar.org" + rssDetail.InnerText;
}
else
{
link = rssDetail.InnerText;
}
}
else
{
link = rssDetail.InnerText;
}
}
else
{
link = "";
}
rssDetail = rssItems.Item(i + n).SelectSingleNode("description");
if (rssDetail != null)
{
if (!rssDetail.InnerText.Substring(3, 3).Equals("Ad:"))
{
description = rssDetail.InnerText;
}
}
else
{
description = "";
}
switch (feed)
{
case "tayyar": sb.Append("<div class='imgsep'><li><img src='logos/tayyar.jpg' width='50px' height='30px'/> <a href='" + link + "' target='_blank'>" + title + "</a> <img src='Images/smallarrow.png'/></li></div>");
break;
case "14march": sb.Append("<div class='imgsep'><li><img src='logos/14march.jpg' width='50px' height='30px'/> <a href='" + link + "' target='_blank'>" + title + "</a> <img src='Images/smallarrow.png'/></li></div>");
break;
case "annahar": sb.Append("<div class='imgsep'><li><img src='logos/annahar.jpg' width='50px' height='30px'/> <a href='" + link + "' target='_blank'>" + title + "</a> <img src='Images/smallarrow.png'/></li></div>");
break;
case "alakhbar": sb.Append("<div class='imgsep'><li><img src='logos/akhbar.jpg' width='50px' height='30px'/> <a href='" + link + "' target='_blank'>" + title + "</a> <img src='Images/smallarrow.png'/></li></div>");
break;
case "sadabeirut": sb.Append("<div class='imgsep'><li><img src='logos/echobeirut.png' width='50px' height='30px'/> <a href='" + link + "' target='_blank'>" + title + "</a> <img src='Images/smallarrow.png'/></li></div>");
break;
case "assafir": sb.Append("<div class='imgsep'><li><img src='logos/assafir.png' width='50px' height='30px'/> <a href='" + link + "' target='_blank'>" + title + "</a> <img src='Images/smallarrow.png'/></li></div>");
break;
case "aliwaa": sb.Append("<div class='imgsep'><li><img src='logos/aliwaa.jpg' width='50px' height='30px'/> <a href='" + link + "' target='_blank'>" + title + "</a> <img src='Images/smallarrow.png'/></li></div>");
break;
}
}
sb.Append("</ul>");
}
return sb.ToString();
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
oldbcon = opncon();
using (oldbcon)
{
SqlDataAdapter ad = new SqlDataAdapter("SELECT * from LebPolRss", oldbcon);
ad.Fill(dt);
}
n = 4;
for (int i = 0; i < dt.Rows.Count; i++)
{
Literal feed = new Literal();
try
{
feed.Text = ProcessRss(dt.Rows[i][3].ToString(), dt.Rows[i][4].ToString());
}
catch (WebException ex) { WebResponse response = ex.Response; }
Panel1.Controls.Add(feed);
}
LinkButton1.Visible = false;
}
public static SqlConnection opncon()
{
string connectionString = "Data Source=RAYYAN-THINK;Initial Catalog=newsProject;Integrated Security=True";
SqlConnection conn = new SqlConnection(connectionString);
return conn;
}
}
Stack Trace:
[XmlException: Root element is missing.]
System.Xml.XmlTextReaderImpl.Throw(Exception e) +69
System.Xml.XmlTextReaderImpl.ParseDocumentContent() +5589128
System.Xml.XmlTextReaderImpl.Read() +215
System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +145
System.Xml.XmlDocument.Load(XmlReader reader) +107
System.Xml.XmlDocument.Load(Stream inStream) +130
poletics.ProcessRss(String rssUrl, String feed) in c:\Users\RAYYAN\Documents\Visual Studio 2012\WebSites\WebSite1\poletics.aspx.cs:57
poletics.Page_Load(Object sender, EventArgs e) in c:\Users\RAYYAN\Documents\Visual Studio 2012\WebSites\WebSite1\poletics.aspx.cs:36
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +92
System.Web.UI.Control.LoadRecursive() +54
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772
224
'The root element is missing' message is triggered when the Controller cache files are corrupt. These are the files with file extensions *.DSS and *.DSD. By default, they are stored inside the following folder: %APPDATA%\Cognos\CCR.
Each XML document has exactly one single root element. It encloses all the other elements and is, therefore, the sole parent element to all the other elements. ROOT elements are also called document elements. In HTML, the root element is the <html> element.
Error explains the most common case of the exception : you have a root element missing in your xml.
Meaning, you most likely have several 'root' elements therefore those are not root elements. You need a single xml element encapsulating everything else. This is first thing to check
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