Creates a simple RSS feed for blogs/articles etc

RSSFeed.cs

/// <summary>
    /// Creates a simple RSS feed for blogs/articles etc
    /// </summary>
    /// <remarks></remarks>
    public class RSSFeed
    {
        /// <summary>
        ///A custom string writer which outputs in UTF8 rather than UTF16
        ///</summary>
        ///<remarks></remarks>
        internal class UTF8StringWriter : StringWriter
        {
            public override Encoding Encoding
            {
                get
                {
                    return System.Text.Encoding.UTF8;
                }
            }
            public UTF8StringWriter(StringBuilder stringBuilder) : base(stringBuilder)
            {
            }
            public UTF8StringWriter(StringBuilder stringBuilder, System.IFormatProvider format) : base(stringBuilder, format)
            {
            }
        }

        private XmlDocument _document;
        /// <summary>
        ///Returns the XML document
        ///</summary>
        ///<value></value>
        ///<returns></returns>
        ///<remarks></remarks>
        private XmlDocument Document
        {
            get
            {
                return _document;
            }
        }

        /// <summary>
        ///Returns a UTF8 string representation of the XML document
        ///</summary>
        ///<value></value>
        ///<returns></returns>
        ///<remarks></remarks>
        public new string ToString
        {
            get
            {
                var b = new StringBuilder();
                using (var w = new UTF8StringWriter(b))
                {
                    _document.Save(w);
                }
                return b.ToString();
            }
        }

        /// <summary>
        ///Initialise the XML document and create the opening rss tags
        ///</summary>
        ///<remarks></remarks>
        public RSSFeed()
        {
            _document = new XmlDocument();
            Document.AppendChild(Document.CreateNode(XmlNodeType.XmlDeclaration, null, null));

            // Create the root element and add any name spaces
            var rootelement = Document.CreateElement("rss");
            rootelement.SetAttribute("version", "2.0");

            Document.AppendChild(rootelement);

            // Add the name spaces we use
            AddNamespace("dc", "http://purl.org/dc/elements/1.1/");
            AddNamespace("content", "http://purl.org/rss/1.0/modules/content/");
        }

        /// <summary>
        ///Adds a prefix and url as a namespace to the rss root element
        ///</summary>
        ///<param name="prefix">The prefix for the namespace</param>
        ///<param name="url">The reference url</param>
        ///<remarks></remarks>
        public void AddNamespace(string prefix, string url)
        {
            Document.DocumentElement.SetAttribute("xmlns:" + prefix, url);
        }

        /// <summary>
        ///Creates the channel in the RSS feed
        ///</summary>
        ///<param name="title">The title</param>
        ///<param name="link">The link to the full website</param>
        ///<param name="description">A brief description</param>
        ///<param name="dateLastChanged">The date/time the channel was last updated</param>
        ///<param name="language">The language of the channel</param>
        ///<remarks></remarks>
        public void CreateChannel(string title, string link, string description, string language)
        {
            // First check we haven't already created a chnanel, as there should only be one in the feed
            var channels = Document.GetElementsByTagName("channel");

            if (channels.Count > 0)
                throw new ArgumentException("Channel " + channels[0].Name + " has already been created");

            var mainchannel = channels[0];

            // Create the channel element
            mainchannel = Document.CreateElement("channel");
            mainchannel.AppendChild(CreateTextElement("title", title));
            mainchannel.AppendChild(CreateTextElement("link", link));
            mainchannel.AppendChild(CreateTextElement("description", description));
            mainchannel.AppendChild(CreateTextElement("language", language));
            
            Document.DocumentElement.AppendChild(mainchannel);
        }

        /// <summary>
        ///Writes an item to the channel
        ///</summary>
        ///<param name="Title">The title of the item</param>
        ///<param name="Link">A link to the full post</param>
        ///<param name="Description">A description of the items</param>
        ///<remarks></remarks>
        public void WriteRSSItem(string Title, string Link, string Description)
        {
            // First check we haven't already created a chnanel, as there should only be one in the feed
            var channels = Document.GetElementsByTagName("channel");
            if (channels.Count == 0)
                throw new ArgumentException("Please create a channel first by calling CreateChannel");

            var mainchannel = channels[0];

            // Create an item
            var thisitem = Document.CreateElement("item");

            thisitem.AppendChild(CreateTextElement("title", Title));
            thisitem.AppendChild(CreateTextElement("link", Link));
            thisitem.AppendChild(CreateTextElement("description", Description));
            
            // Append the element
            mainchannel.AppendChild(thisitem);
        }
        
        /// <summary>
        ///Creates a simple text element with the given name and inner text value
        ///</summary>
        ///<param name="Name">The name of the element</param>
        ///<param name="Value">The value of it</param>
        ///<returns></returns>
        ///<remarks></remarks>
        private XmlElement CreateTextElement(string Name, string Value)
        {
            XmlElement CreateTextElement = Document.CreateElement(Name);
            CreateTextElement.InnerText = Value;

            return CreateTextElement;
        }        
    }