Creating an RSS feed
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The document discusses how to create an RSS feed using ASP.NET and LINQ. It explains that RSS is an XML format for listing items like blog posts or news headlines. It provides code to generate an RSS XML document dynamically using LINQ, adding items in a for loop to create a sample feed with 10 items. The feed can then be displayed on a webpage by adding an XmlDataSource control bound to the RSS feed URL and configuring it to display the item titles in a DataList control.
Creating an RSS feed
- 1. RSS Feed using ASP.NET & Linq http://www.livetolearn.in
- 2. RSS is a format for an XML document that describes a list of items, such as blog entries or news headlines. The document may just be a stream of XML created on the fly rather than a static file. http://www.livetolearn.in
- 3. <rss> <channel> <item> <title></title> <description></description> <link></link> <pubDate></pubDate> <!--..............................--> </item> </channel> </rss> http://www.livetolearn.in
- 4. Add a generic handler named rsshandler.ashx Add import directive Imports System.Xml.Linq Replace the process request() subroutine as follows http://www.livetolearn.in
- 5. Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest Dim rssdoc As New XDocument(New XDeclaration( "1.0", Nothing, Nothing)) rssdoc.Add( New XComment( "My RSS Feed uses XML to Linq datasource")) Dim rssrootelement As New XElement( "rss", New XAttribute( "version", "2.0")) Dim rsschannel As New XElement( "channel") Dim rsstitle As New XElement( "title", "RK's News Channel") rsschannel.Add(rsstitle) Dim rssdesc As New XElement( "description", "Description of Channel") rsschannel.Add(rssdesc) Dim rsslink As New XElement( "link", "http://www.livetolearn.in/") rsschannel.Add(rsslink) Dim intCtr As Integer Dim rssitem As XElement RSS Document Comment RSS Channel Title (Appears at title bar) RSS Title Link http://www.livetolearn.in
- 6. For intCtr = 0 To 10 rssitem = New XElement( "item", _ New XElement( "title", "This is item number " & intCtr.ToString), _ New XElement( "description", "Description for item # " & _ intCtr.ToString), _ New XElement( "link", "http://www.livetolearn.in/item" & _ intCtr.ToString & ".aspx")) rsschannel.Add(rssitem) Next rssrootelement.Add(rsschannel) rssdoc.Add(rssrootelement) rssdoc.Save(( New System.IO.StreamWriter _ (context.Response.OutputStream))) End Sub This for loop creates 10 sample items with Description. http://www.livetolearn.in
- 7. Now, browse the rsshandler.ashx with Internet Explorer 7 and above or Firefox http://www.livetolearn.in
- 8. Displaying XML data http://www.livetolearn.in
- 9. Add an XmlDataSource control to a ASP.NET page Click smart tag Choose configure data source Enter the URL of the RSS feed For example http://www.livetolearn.in/blog/?feed=rss2 Type the following in Xpath expression text box Rss/channel/item Add a data list control and set source to Xmldatasource1, Edit Item template of data list control Add a hyper link control inside the item template Set it’s data binding property as follows Navigate URL – xPath(“link”) xPath(“title”) It displays the list of items from rss feed. http://www.livetolearn.in
- 10. By adding more items in Item Template (e.g. Text box), we can display description from RSS feed. ******** http://www.livetolearn.in