RssFeed and RssItem classes for easily generating RSS feeds.

RssFeed + RssItem

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Xml.Linq;

namespace Bjerner.Website.Web {
    
    public class RssFeed {

        private List<RssItem> _items = new List<RssItem>(); 
        
        public string Title { get; set; }
        public string Link { get; set; }
        public DateTime PubDate { get; set; }
        public string Generator { get; set; }
        public string Description { get; set; }
        public string Language { get; set; }

        public List<RssItem> Items {
            get { return _items; }
            set { _items = value ?? new List<RssItem>(); }
        }

        public void Add(RssItem item) {
            _items.Add(item);
        }

        public XDocument ToXDocument() {

            XElement xChannel = new XElement(
                "channel",
                new XElement("title", Title ?? ""),
                new XElement("link", Link ?? ""),
                new XElement("pubDate", PubDate.ToUniversalTime().ToString("r")),
                from item in Items select item.ToXElement()
            );

            if (!String.IsNullOrWhiteSpace(Generator)) xChannel.Add(new XElement("generator", Generator));
            if (!String.IsNullOrWhiteSpace(Description)) xChannel.Add(new XElement("description", Description));
            if (!String.IsNullOrWhiteSpace(Language)) xChannel.Add(new XElement("language", Language));
            
            return new XDocument(
                new XDeclaration("1.0", "UTF-8", "true"),
                new XElement(
                    "rss",
                    new XAttribute(XNamespace.Xmlns + "content", "http://purl.org/rss/1.0/content"),
                    xChannel
                )
            );
        
        }

        public void Write() {
            HttpContext.Current.Response.ContentType = "application/rss+xml";
            ToXDocument().Save(HttpContext.Current.Response.OutputStream);
            HttpContext.Current.Response.End();
        }

    }

    public class RssItem {
        
        public string Title { get; set; }
        public string Link { get; set; }
        public DateTime PubDate { get; set; }
        public string Guid { get; set; }
        public string Content { get; set; }

        public XElement ToXElement() {

            // Generate the XML node with mandatory attributes
            XElement xItem = new XElement(
                "item",
                new XElement("title", Title ?? ""),
                new XElement("link", Link ?? ""),
                new XElement("pubDate", PubDate.ToUniversalTime().ToString("r")),
                new XElement("guid", Guid ?? "")
            );

            XNamespace xContent = "http://purl.org/rss/1.0/content";

            // Add optinal attributes
            if (!String.IsNullOrWhiteSpace(Content)) xItem.Add(new XElement(xContent + "encoded", new XCData(Content)));

            return xItem;

        }
        
    }

}