Error while loading RSSstream in XmlDocument

Manikrag

Hi All,

I am getting error while am loading RSS Stream in XMLDocument object. The error is as follows.

"System.Xml.XmlException: '', hexadecimal value 0x19, is an invalid character. Line 18, position 32."

I understand that this is becasue I have one apostrophe in the RSS Feed.

I have tried few tricks to get rid of apostrophe but of no use.

Tried the below trick
1. //CONVERTING STREAM TO STRING

StreamReader reader = new StreamReader(rssStream);

2. //Removing ' from the string

without = fortest.Replace("'", "\"");

3. //CONVERTING STRING TO STREAM

byte[] byteArray = Encoding.ASCII.GetBytes(without);
MemoryStream stream = new MemoryStream( byteArray );

4. XmlTextReader reader1 = new XmlTextReader(stream);

5. rssDoc.Load(reader1);

Below is the code wrriten.....

#############################

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System.Net.WebRequest myRequest = System.Net.WebRequest.Create(rssURL);

System.Net.WebResponse myResponse = myRequest.GetResponse();
 
System.IO.Stream rssStream = myResponse.GetResponseStream();

System.Xml.XmlDocument rssDoc = new System.Xml.XmlDocument();
 
//CONVERTING A STREAM TO STRING

StreamReader reader = new StreamReader(rssStream);

fortest = reader.ReadToEnd();
 
//Removing ' from the string

without = fortest.Replace("'", "\"");
 
//CONVERTING A STRING TO STREAM

byte[] byteArray = Encoding.ASCII.GetBytes(without); 

MemoryStream stream = new MemoryStream( byteArray );
 
XmlTextReader reader1 = new XmlTextReader(stream);
 
try

{

rssDoc.Load(reader1); 

}

catch (System.Xml.XmlException xe)

{

}

But its of no use, let me know if you have any idea about it. its lil urgetn

Thanks,
Manik

Plater

0x19 is not an apostrophe, its an unprintable character EM (end of medium)...which really has no use here?
I am more suspect that the file is in utf16 and not ascii

Manikrag

Thanks a lot Plater!!

I searched a lot on net to get the solution and finally I got it. Sharing it for others..

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##########################################################
 
using System;

using System.IO;

using System.Security;

using System.Xml;

using System.Text;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;
 
public partial class _Default : System.Web.UI.Page 

{

    static string rssf;

    static string fortest;

    static string without;
 
    protected void Page_Load(object sender, EventArgs e)

    {

        rssf = null;

        string rssURL = "";

        ProcessRSSItem(rssURL);

    }
 
    public string SanitizeXmlString(string xml)

    {

        if (xml == null)

        {

            throw new ArgumentNullException("xml");

        }
 
        StringBuilder buffer = new StringBuilder(xml.Length);
 
        foreach (char c in xml)

        {

            if (IsLegalXmlChar(c))

            {

                buffer.Append(c);

            }

        }
 
        return buffer.ToString();

    }
 
    /// <summary>   

    /// Whether a given character is allowed by XML 1.0.   

    /// </summary>   

    public bool IsLegalXmlChar(int character)

    {

        return

        (

             character == 0x9 /* == '\t' == 9   */          ||

             character == 0xA /* == '\n' == 10  */          ||

             character == 0xD /* == '\r' == 13  */          ||

            (character >= 0x20 && character <= 0xD7FF) ||

            (character >= 0xE000 && character <= 0xFFFD) ||

            (character >= 0x10000 && character <= 0x10FFFF)

        );

    }  

    public void ProcessRSSItem(string rssURL)

    {
 
        System.Net.WebRequest myRequest = System.Net.WebRequest.Create(rssURL);

        System.Net.WebResponse myResponse = myRequest.GetResponse();
 
        System.IO.Stream rssStream = myResponse.GetResponseStream();

        System.Xml.XmlDocument rssDoc = new System.Xml.XmlDocument();
 
        //CONVERTING A STREAM TO STRING

        StreamReader reader = new StreamReader(rssStream);
 
        fortest = reader.ReadToEnd();
 
        //Removing ' from the string

         without = fortest.Replace("'", "\"");
 
        //CONVERTING A STRING TO STREAM

        byte[] byteArray = Encoding.ASCII.GetBytes(without); 

        MemoryStream stream = new MemoryStream( byteArray );
 
        XmlTextReader reader1 = new XmlTextReader(stream);
 
        //Response.Write(without);
 
        try

        {

            rssDoc.LoadXml(SanitizeXmlString(without));  
 
            System.Xml.XmlNodeList rssItems = rssDoc.SelectNodes("rss/channel/item");
 
            string title = "";

            string link = "";

            string description = "";
 
            for (int i = 0; i < rssItems.Count; i++)

            {

                System.Xml.XmlNode rssDetail;
 
                rssDetail = rssItems.Item(i).SelectSingleNode("title");

                if (rssDetail != null)

                {

                    title = rssDetail.InnerText;

                }

                else

                {

                    title = "";

                }
 
                rssDetail = rssItems.Item(i).SelectSingleNode("link");

                if (rssDetail != null)

                {

                    link = rssDetail.InnerText;

                }

                else

                {

                    link = "";

                }
 
                rssDetail = rssItems.Item(i).SelectSingleNode("pubDate");

                if (rssDetail != null)

                {

                    description = rssDetail.InnerText;

                }

                else

                {

                    description = "";

                }
 
                // Response.Write("<a href='" + link + "' target='new'>" + title + "</a></b><br/>");

                rssf = rssf + "<a href='" + link + "' target='new'>" + title + "&nbsp -" + description + "</a>" + "</b><br/><br/>";

                lblrss.Text = rssf;
 
            }

        }//End try

        catch (System.Xml.XmlException xe)

        {

            //string rawXml = without;

            //string invalidCharsMatch = "(?ims)[\x0\x1\x2\x3\x4\x5\x6\x7\x8\x9\xb\xc\xe\xf" + "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19]";

            //rawXml = System.Text.RegularExpressions.Regex.Replace(rawXml, invalidCharsMatch, "");

            //rssDoc.LoadXml(rawXml);  
 
            lblrss.Text = xe.ToString();
 
        }
 
    }
 
}

##########################################################

Error while loading RSSstream in XmlDocument

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