Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

How to add item image information to rss news feed using ASP.NET

Posted on 2014-09-04
1
519 Views
Last Modified: 2014-09-05
I'm trying to include an image in the rss feed xml I'm generateing using XmlTextWriter. I have two problems:

1. What is the correct output format for this information? I found one source that suggests it should be formatted as follows:

<item>...<media:content medium="image" url="http://www.somedomain.com/images/someimage.jpg"></media:content></item>

But other sources seem to suggest I should be using the enclosure element.

2. I tried to use the following code to generate my xml but when I look at it via the browser, I get "Reference to undeclared namespace prefix: 'media'."

Here's the code:
        Response.Clear()
        Response.ContentType = "text/xml"
        Dim xtwFeed As XmlTextWriter = New XmlTextWriter(Response.OutputStream, Encoding.UTF8)
        xtwFeed.WriteStartDocument()
        'The mandatory rss tag

        xtwFeed.WriteStartElement("rss")
        xtwFeed.WriteAttributeString("version", "2.0")

        'The channel tag contains RSS feed details
        xtwFeed.WriteStartElement("channel")
        xtwFeed.WriteElementString("title", "My News :: News")
        xtwFeed.WriteElementString("link", "http://www.mydomain.net/news.aspx")
        xtwFeed.WriteElementString("description", "The latest news from My domain.")
        xtwFeed.WriteElementString("copyright", "Copyright 2010 My Group. All rights reserved.")
        xtwFeed.WriteElementString("category", "News")
        xtwFeed.WriteElementString("ttl", "120")

        xtwFeed.WriteStartElement("image")
        xtwFeed.WriteElementString("url", "http://www.mydomain.net/images/logo.jpg")
        xtwFeed.WriteElementString("title", "The latest news from My Group.")
        xtwFeed.WriteElementString("link", "http://www.mydomain.net/")
        xtwFeed.WriteEndElement()

        Dim buildDate As Date = TimeZoneInfo.ConvertTimeToUtc(Now())
        xtwFeed.WriteElementString("lastBuildDate", buildDate.ToString("R"))
        For Each dr As DataRow In T.Rows
            xtwFeed.WriteStartElement("item")
            xtwFeed.WriteElementString("title", FormatForXML(dr.Item("nevTitle").ToString()))
            xtwFeed.WriteElementString("description", FormatForXML(dr.Item("nevDesc").ToString()))
            xtwFeed.WriteElementString("link", "http://www.mydomain.net/newsdetail.aspx?ID=" & dr.Item("nevID"))
            Dim d As Date = TimeZoneInfo.ConvertTimeToUtc(dr.Item("nevStartDate"))
            xtwFeed.WriteElementString("pubDate", d.ToString("R"))

            If Not DBNull.Value.Equals(dr.Item("nevPic1")) Then
               xtwFeed.WriteStartElement("media:content")
                xtwFeed.WriteAttributeString("medium", "image")
                xtwFeed.WriteAttributeString("url", dr.Item("nevPic1"))
                xtwFeed.WriteEndElement()
            End If

            xtwFeed.WriteEndElement()
        Next

        'Close all tags 
        xtwFeed.WriteEndElement()
        xtwFeed.WriteEndElement()
        xtwFeed.WriteEndDocument()
        xtwFeed.Flush()
        xtwFeed.Close()
        Response.End()

Open in new window


This code writes the media:content as <media:content medium="image" url="/images/NewsEvents/Image01.jpg" />.

My goal is to use this feed as the input to DevExpress's ASPxNewsControl.

Thank you for any assistance you can provide.
0
Comment
Question by:ZekeLA
1 Comment
 
LVL 1

Accepted Solution

by:
ZekeLA earned 0 total points
ID: 40305887
I found the problem. I needed to add the following code after the line with the 2.0 version attribute:

xtwFeed.WriteAttributeString("xmlns:media", "http://search.yahoo.com/mrss/")    ' note that media must be spelled as lowercase

Open in new window

0

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction In my previous article (http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SSIS/A_9150-Loading-XML-Using-SSIS.html) I showed you how the XML Source component can be used to load XML files into a SQL Server database, us…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…

789 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question